John Hegarty
Fellow Emeritus, Fellows Emeritii

Publications and Further Research Outputs

Peer-Reviewed Publications

Stevenson NJ, Murphy AG, Bourke NB, Keogh CA, Hegarty JE, O'Farrelly C, Ribavirin Enhances IFN-α Signalling and MxA Expression: A Novel Immune Modulation Mechanism during Treatment of HCV, PLoS One, 6, (11), 2011, pe27866 Journal Article, 2011 TARA - Full Text

Walker AC, Fancey SJ, Desmulliez MPY, Forbes MG, Casswell JJ, Buller GS, Taghizadeh MR, Dines JAB, Stanley CR, Pennelli G, Boyd AR, Pearson JL, Horan P, Byrne D, Hegarty J, Eitel S, Gauggel HP, Gulden KH, Gauthier A, Benabes P, Gutzwiller JL, Goetz M, Oksman J , Operation of an optoelectronic crossbar switch containing a terabit-per-second free-space optical interconnect , IEEE JOURNAL OF QUANTUM ELECTRONICS , 41, (7), 2005, p1024 - 1036 Journal Article, 2005 TARA - Full Text

L.A. Dunbar, M. Lynch, A.L. Bradley, J.F. Donegan, J. Hegarty, R.P. Stanley , U. Oesterle , R. Houdré , M. Ilegems , Collisional Broadening of Semiconductor Microcavity Polaritons, Physica Status Solidi (a) - Applied Research, 190, 2002, p435 - 440 Journal Article, 2002 URL DOI

Shaw, A., Folliot, H., Bradley, A. L., Hegarty, J., Donegan, J. F., Impact of carrier diffusion in quantum wells and quantum dots on the behaviour of etched microcavity structures, Institute of Physics Conference Series , Proceedings of the 26th International Conference on the Physics of Semiconductors, Institute of Physics, 2002, edited by Long, A.R., Davies, J.H. , 171, (Paper D172), 2002 Conference Paper, 2002

Dunbar LA, Stanley RP, Lynch M, Hegarty J, Oesterle U, Houdre R, Ilegems M, Excitation-induced coherence in a semiconductor microcavity, Physical Review B, 66, (19), 2002, p195307-1 - 195307-5 Journal Article, 2002 TARA - Full Text

H. Folliot, M. Lynch, A.L. Bradley, L.A. Dunbar, J. Hegarty, J.F. Donegan, L.P. Barry, J.S. Roberts and G.Hill, Two-photon absorption enhancement in bulk AlGaAs semiconductor microcavities, Virtual Journal of nanoscale Science and Technology, 5, 2002, p9- Journal Article, 2002

H. Folliot, M. Lynch, A.L. Bradley, T. Krug, L.A. Dunbar, J. Hegarty, J.F. Donegan, L.P. Barry, J.S. Roberts and G. Hill, Two-photon induced photoconductivity enhancement in semicondcutor microcavities: a theoretical invetsigation, Journal of the Optical Society of America B, 19, (10), 2002, p2396 - 2402 Journal Article, 2002 URL DOI

Mcaleavey F. J., O'gorman J., Donegan J. F., Hegarty J., Maze G, Extremely high sensitivity gas detection at 2.3 [mu]m using a grazing incidence Tm3+ fibre laser cavity, Sensors and actuators A: physical , 87, (3), 2001, p107 - 112 Journal Article, 2001 DOI

McAleavey F.J.; O'Gorman J.; Donegan J.F.; Hegarty J.; Mazé G.; Poignant H., Operation of Tm3+ fiber laser at lambda = 2.3 mum coupled to a silica fiber Bragg grating, Optical and Quantum Electronics, 33, (2), 2001, p151 - 164 Journal Article, 2001 DOI

K. Boy Ian, V. Weldon, D. McDonald, J .O'Gorman and J. Hegarty, Sampled grating DBR laser as a spectroscopic source in multigas detection at 1.52-1.57um, IEE Proceedings of Optoelectronics, 148, (1), 2001, p19 - 24 Journal Article, 2001 DOI TARA - Full Text

Fancey, S.J.; Casswell, J.J.; Taghizadeh, M.R.; Walker, A.C.; Desmulliez, M.P.Y.; Stanley, C.R.; Boyd, A.; Pearson, J.L.; Horan, P.; Byrne, D.; Hegarty, J.; Eitel, S.; Gauggel, H.-P.; Gulden, K.; Gauthier, A.; Benabes, P.; Gutzwiller, J.L.; Goetz, M.;, Smart-pixel based free-space optoelectronic interconnect to demonstrate terabit/s regime I/O to silicon CMOS, IEE Seminar on Microdisplay and Smart Pixel Technologies (Ref. No. 2000/006), 17 March, 2000, p3/1 - 3/5 Journal Article, 2000 URL

F.P. Logue, J.A. Patchell, J. O''Gorman, J. Hegarty, B.A. Usievich and V.A. Sychugov, Novel waveguide design for high brightness optoelectronic applications, Optical and Quantum Electronics, 32, (10), 2000, p1175 - 1182 Journal Article, 2000 DOI

A. L. Bradley, J. P. Doran, J. Hegarty, R. P. Stanley, U. Oesterle, R. Houdré and M. Ilegems, Nonlinear reflectivity of strongly coupled exciton-photon systems under resonant and non-resonant pumping , Journal of Luminescence, 85, (4), 2000, p261 - 270 Journal Article, 2000 URL DOI

Andrew C. Walker, MArc P.Y. Desmulliez, Mark G. Forbes, Stuart J. Fancey, Geral S. Buller, Mohammad R. Taghizadeh, Julian A. B. Dines, C. R. Stanley, Giovanni Pennelli, Adam R. Boyd, Paul Horan, Declan Byrne, John Gegarty, Sven Eitel, Hans-Peter Gauggel, K.H. Gulden, Alain Gauther, Philippe Benabes, Jean-Louis Gurzwiller, Michel Goetz, Design and Construction of an Optoelectronic. Crossbar Switch Containing a Terabit per. Second Free-Space Optical Interconnect, IEEE Journal of Selected Topics in Quantum Electronics, 5, (2), 1999, p236 - 249 Journal Article, 1999 TARA - Full Text URL

Landais, P.; Roycroft, B.; Shaw, A.; Depreter, B.; Moerman, I.; Hegarty, J.;, Small-signal analysis of 1.3/spl mu/m microcavity light-emitting diodes, IEEE Photonics Technology Letters, 11, (11), 1999, p1342 - 1344 Journal Article, 1999 URL TARA - Full Text

Patchell, J. A.; Logue, F. P.; O'Gorman, J.; Hegarty, J.; Usievich, B. A.; Sychugov, V. A., Demonstration of high-brightness-mode propagation in a compound waveguide structure, Applied Physics Letters, 75, (2), 1999, p169 - 171 Journal Article, 1999 DOI URL TARA - Full Text

Rees, P.; McEvoy, P.; Valle, A.; O'Gorman, J.; Lynch, S.; Landais, P.; Pesquera, L.; Hegarty, J.;, A theoretical analysis of optical clock extraction using a self pulsating laser diode. , IEEE Journal of Quantum Electronics, 35, (2), 1999, p221 - 227 Journal Article, 1999 URL TARA - Full Text

C. Jordan, J. F. Donegan, J. Hegarty, B. J. Roycroft, S. Taniguchi, T. Hino, E. Kato, N. Noguchi, and A. Ishibashi , Carrier-density dependence of the photoluminescence lifetimes in ZnCdSe/ZnSSe quantum wells at room temperature, Applied Physics Letters, 74, 1999, p3359 - 3361 Journal Article, 1999 TARA - Full Text DOI

Shaw, A.; Roycroft, B.; Hegarty, J.; Labilloy, D.; Benisty, H.; Weisbuch, C.; Krauss, T. F.; Smith, C. J. M.; Stanley, R.; Houdré, R.; Oesterle, U., Lasing properties of disk microcavity based on a circular Bragg reflector, Applied Physics Letters, 75, (20), 1999, p3051 - 3053 Journal Article, 1999 DOI

A.L. Bradley, L.A. Dunbar, J.P. Doran, J. Hegarty, R.P. Stanley, R. Houdre, U.Oesterle and M. Ilegems, Dephasing of strongly coupled exciton-photon systems, Proceedings of the Third International Conference on Excitonic Processes in Condensed Matter. EXCON'98 Electrochemical Society Proceedings 98-25, 10, 1998, ppxii+574 Conference Paper, 1998

A. Egan; M. Harley-stead; P. Rees b; S. Lynch; P. McEvoy; J. O'gorman; J. Hegarty, All-optical synchronization of self-pulsating laser diodes with frequency multiplication and division , Journal of Modern Optics, 45, (6), 1998, p1239 - 1248 Journal Article, 1998 DOI

D.T.Fewer,C.Jordan, S.J.Hewlett, E.M.McCabe, F.P.Logue, J.F.Donegan,J.Hegarty, S.Taniguchi, T.Hino, K.Nakano and A.Ishibashi, Degradation dynamics of II-VI (ZnCdSe) quantum well materials using confocal photoluminescence microscopy, Proceedings of Royal Microscopical Society Conference on Microscopy of Semiconducting Materials, Royal Microscopical Society Conference on Microscopy of Semiconducting Materials, 157, 1998, pp569 - 572 Conference Paper, 1998

Logue, F.P.; Rees, P.; Jordan, C.; Donegan, J.F.; Hegarty, J.; Hiei, F.; Taniguchi, S.; Hino, T.; et. al, Optical gain in (Zn,Cd)Se-Zn(S,Se) quantum wells as a function of temperature , Journal of Crystal Growth, 185, 1998, p623 - 626 Journal Article, 1998 URL

Lynch, S.; McEvoy, P.; Landais, P.; O'Gorman, J.; McDonald, D.; Hegarty, J.;, Effect of temperature on self-pulsation in narrow stripe, gain-guided, compact disk laser diodes, Conference on Lasers and Electro-Optics, 1998 (CLEO 98), 3-8 May, IEEE, 1998, pp239 - 240 Conference Paper, 1998 URL TARA - Full Text

F. P. Logue, P. Rees, J. F. Heffernan, C. Jordan, J. F. Donegan, J. Hegarty, F. Hiei, S. Taniguchi, T. Hino, K. Nakano, and A. Ishibashi, Optical gain in (Zn, Cd)Se-Zn(S, Se) quantum wells, Journal of the Optical Society of America, 15, (4), 1998, p1295 - 1304 Journal Article, 1998 DOI

F. P. Logue, P. Rees, J. F. Heffernan, C. Jordan, J. F. Donegan, and J. Hegarty and F. Hiei, S. Taniguchi, T. Hino, K. Nakano, and A. Ishibashi, Optical gain in (Zn, Cd)Se-Zn(S, Se) quantum wells, Journal of Crystal Growth, 15, (4), 1998, p1295 - 1304 Journal Article, 1998 DOI

A. L. Bradley, J. P. Doran, T. Aherne, and J. Hegarty and R. P. Stanley, R. Houdré, U. Oesterle, and M. Ilegems, Nonlinear reflectivity of semiconductor microcavities in the weak- and strong-coupling regimes: Experiment and theory, Physical Review B, 57, (16), 1998, p9957 - 9964 Journal Article, 1998 DOI URL

V. Weldon, J. O'Gorman, J. J. P"erez-Camacho, D. McDonald, J. Hegarty, and B. Corbett, Methane Sensing with a Novel Micromachined. Single-Frequency Fabry-Perot Laser Diode. Emitting at 1331 nm., IEEE Photonics Technology Letters, 9, (3), 1997, p357 - 359 Journal Article, 1997 DOI TARA - Full Text

D.T.Fewer, S.J.Hewlett , E.M.McCabe and J.Hegarty, Direct-view microscopy: experimental investigation of the dependence of the optical sectioning characteristics on pinhole-array configuration, Journal of Microscopy, 187, (1), 1997, p54 - 61 Journal Article, 1997 DOI

Weldon V.; O'Gorman J.; Perez-Camacho J.J.; McDonald D.; Hegarty J.; Connolly J.C.; Morris N.A.; Martinelli R.U.; Abeles J.H., Laser diode based oxygen sensing: A comparison of VCSEL and DFB laser diodes emitting in the 762 nm region , Infrared Physics and Technology, 38, (6), 1997, p325 - 329 Journal Article, 1997 DOI

F. P. Logue, P. Rees, J. F. Heffernan, C. Jordan, J. F. Donegan, and J. Hegarty and F. Hiei and A. Ishibashi , Effect of Coulomb enhancement on optical gain in (Zn,Cd)Se/ZnSe multiple quantum wells, Physical Review B, 54, (23), 1997, p16417 - 16420 Journal Article, 1997 TARA - Full Text DOI

Weldon V.;Perezcamacho JJ.;Hegarty J.;Connolly JC.;Morris NA.;O'Gorman J., Oxygen sensing using single-frequency DFB laser diodes at λ = 761 nm , Sensors and Actuators B: Chemical, 42, (3), 1997, p163 - 168 Journal Article, 1997 DOI

Logue, F. P.; Fewer, D. T.; Hewlett, S. J.; Heffernan, J. F.; Jordan, C.; Rees, P.; Donegan, J. F.; McCabe, E. M.; Hegarty, J.; Taniguchi, S.; Hino, T.; Nakano, K.; Ishibashi, A., Optical measurement of the ambipolar diffusion length in a ZnCdSe-ZnSe single quantum well, Journal of Appleid Physics, 81, (1), 1997, p536 - 538 Journal Article, 1997 DOI TARA - Full Text

J.P. Doran, A.L. Bradley, B. Roycroft, T. Aherne, J. Hegarty, R.P. Stanley, R. Houdre, U. Oesterle and M. Ilegems, Semiconductor microcavities: Physics and applications of strong and weak coupling, edited by F. Ren , 1996, pp333-340 Conference Paper, 1996

T. Aherne , A. L. Bradley, J. P. Doran, J. O'Gorman, J. F. Heffernan, J. Hegarty, H. De Neve, C. Brys, G. Geens, P. Van Daele, R. Baets, P. Demeester, K. Rakennus, A. Salokatve, P. Uusimaa and M. Pessa, Optical properties of a ZnSSe microcavity fabricated by epitaxial lift-off, Journal of Crystal Growth, 159, (1-4), 1996, p636 - 639 Journal Article, 1996 DOI

Brian Kelly, Paul Horan, Frank A. P. Tooley, Mohammad R. Taghizadeh, and John Hegarty , Optical lateral inhibition networks that use self-linearized self-electro-optic-effect devices: theory and experiment, Applied Optics, 35, (8), 1996, p1372 - 1380 Journal Article, 1996 DOI

V. Weldon, J. O'Gorman, J.J. Pérez-Camacho, and J. Hegarty, Oxygen sensiing using single frequency. GaAs-AIGaAs DFB laser diodes and. VCSELs. , Electronic Letters, 32, (3), 1996, p219 - 221 Journal Article, 1996 DOI

Growth and characterization of II-VI structures for microcavities, distributed bragg reflectors, and blue-green lasers. in, Institute of Physics Conference Series, 1996, pp1163 - 1168, [M. Pessa, K. Rakennus, P. Uusimaa, A. Salokatve, , T. Aherne, J.P. Doran and J. Hegarty. ] Book Chapter, 1996

Donegan, J.F., Heffernan, J.F., Hegarty,J., Hiei, H., Ishibashi, A.,.Jordan, C., Logue, F.P., Rees, P., Optically pumped ZnCdSe-ZnSe quantum wells, Proceedings of SPIE, Physics and Simulation of Optoelectronic Devices IV , San Jose, CA, USA , 29th January, edited by Weng W. Chow, Marek Osinski , 2693, 1996, pp121 - 127 Conference Paper, 1996 DOI TARA - Full Text

K Fobelets, B Kelly, P Horan and J Hegarty, Controlled shift of the optical resonance of fully processed asymmetric Fabry - Pérot modulator arrays., Semiconductor Science and Technology, 11, 1996, p582 - 586 Journal Article, 1996 DOI

A. Egan; M. Harley-Stead; P. Rees; S. Lynch; J. O'Gorman; J. Hegarty;, An experimental and theoretical analysis of jitter in self-pulsating lasers synchronized to periodic electrical signals, IEEE Photonics Technology Letters, 8, (6), 1996, p758 - 760 Journal Article, 1996 TARA - Full Text

Rees, C. Cooper, P. M. Smowton, P. Blood, imd J. Hegarty, Calculated Threshold Currents of Nitride- and. Phosphide-Based Quantum-Well Lasers, IEEE Photonics Technology Letters, 8, (2), 1996, p197 - 199 Journal Article, 1996 URL DOI TARA - Full Text

P. Rees, F. P. Logue, J. F. Donegan, J. F. Heffernan, C. Jordan, and J. Hegarty, Calculation of gain‐current characteristics in ZnCdSe‐ZnSe quantum well structures including many body effects., Applied Physics Letters, 67, (25), 1996, p3780 - 3782 Journal Article, 1996 DOI TARA - Full Text

A. Egan, P. Rees, J . O'Gorman, M. Harley-Stead, G.Farrell, J. Hegarty, P. Phelan, Theoretical investigations of electro-optical synchronisation of self-pulsating laser diodes, IEE Proceedings of Optoelectronics, 143, (1), 1996, p31 - 36 Journal Article, 1996 URL

K. Rakennus, P. Uusimaaa, J. Näppia, A. Salokatvea, M. Pessaa, T. Aherne, J. P. Doran, J. O'Gorman and J. Hegarty, Growth of II-VI Bragg mirrors by molecular beam epitaxy, Journal of Crystal Growth , 159, (1-4), 1996, p628 - 631 Journal Article, 1996 DOI

E. M. McCabe, D. T. Fewer, A. C. Ottewill, S. J. Hewlett J. Hegarty, Direct-view microscopy: optical sectioning strength for finite-sized, multiple-pinhole arrays, Journal of Microscopy, 184, (2), 1996, p95 - 105 Journal Article, 1996 DOI

J. F. Donegan, C. Jordan, P. Rees, F. Logue, J. F. Hefferman and J. Hegarty, A study of internal losses in CdZnSe/ZnSe multiple quantum well materials, Journal of Crystal Growth, 159, (1-4), 1996, p653 - 656 Journal Article, 1996 DOI

Egan, A.; Harley-Stead, M.; Rees, P.; Lynch, S.; McEvoy, P.; O'Gorman, J.; Hegarty, J., All-optical synchronization of self-pulsating laser diodes, Applied Physics Letters, 68, (25), 1996, p3534 - 3536 Journal Article, 1996 TARA - Full Text DOI

Rees, P. Heffernan, J.F. Logue, F.P. Donegan, J.F. Jordan, C. Hegarty, J. Hiei, F. Ishibashi, A. , High temperature gain measurements in optically pumped ZnCdSe-ZnSe quantum wells., IEE Proceedings - Optoelectronics, 143, (1), 1996, p110 - 112 Journal Article, 1996 URL

Dynamical studies of cavity polaritons in semiconductor microcavities in, 1996, pp59-67 , [J. P. Doran, A.L. Bradley, B. Roycroft, T. aherne, J. Hegarty, R.P. Stanley, R. Houdre, U. Oesterle and M. Ilegems ] Book Chapter, 1996

O'Sullivan, G.; Hegarty, J.; Horan, P.; Kakizaki, S.; Kelly, B.; McCabe, E., Simulation of a novel, optically addressable, switched-current/continuous-time, current- mode cellular neural network, Electronic Letters, 31, 1995, p563 - 564 Journal Article, 1995 URL

T. Miyajima, F. P. Logue, J. F. Donegan, and J. Hegarty and H. Okuyama, A. Ishibashi, and Y. Mori, Quasi-two-dimensional exciton in ZnSe/ZnMgSSe single quantum well, Applied Physical Letters, 66, (2), 1995, p180 - 182 Journal Article, 1995 TARA - Full Text DOI

Weldon V., O'Gorman J., Phelan P., Hegarty J., Tanbun-Ek T., H2S and CO2 gas sensing using DFB laser diodes emitting at 1.57 mm, Sensors and Actuators B: Chemical, 29, (1-3), 1995, p101 - 107 Journal Article, 1995 DOI

Large reduction of saturation carrier densities by strain in ingaas/algaas quantum-wells in, IOP Conference Series, 1995, pp569 - 572, [Moloney, M, Hegarty, J, Buydens, L, Demeester, P] Book Chapter, 1995

P. Uusimaa, K. Rakennus, A. Salokatve, M. Pessa, T. Aherne, J. P. Doran, J. O'Gorman, and J. Hegarty, Molecular beam epitaxy growth of MgZnSSe/ZnSSe Bragg mirrors controlled by in situ optical reflectometry., Applied Physics Letters, 67, 1995, p2197 - 2199 Journal Article, 1995 TARA - Full Text

Brys, C.; Vermaerke, F.; Demeester, P.; van Daele, P.; Rakennus, K.; Salokatve, A.; Uusimaa, P.; Pessa, M.; Bradley, A. L.; Doran, J. P.; O'Gorman, J.; Hegarty, J., Epitaxial lift-off of ZnSe based II-VI structures, Applied Physics Letters, 66, (9), 1995, p1086 - 1088 Journal Article, 1995 TARA - Full Text

Kakizaki, Sunao; Horan, Paul; Hegarty, John., Surface-normal cascaded planar interconnection with easy alignment, Optics Letters, 20, (22), 1995, p2294 - 2296 Journal Article, 1995 DOI

P. Rees, C. Cooper, P. Blood, P.M. Smowton and, Gain characteristics of GaN quantum wells including many body effects, Electronic Letters, 31, (14), 1995, p1149 - 1150 Journal Article, 1995 URL

The monolithic integration of quantum-well high-electron-mobility field-effect transistors, and asymmetric Fabry-Perot optical modulators. in, Institute of Physics Conference Series, IOP, 1995, pp519 - 522, [O'Sullivan, G., Aherne, T., McCabe, E., Hegarty, J., Horan, P. , Corbett, B.] Book Chapter, 1995

K. Fobelets, G. Borghs and J. Hegarty. , Experimental drain current drop-back in. GaAs MESFETs., Electronic Letters, 31, 1995, p2042 - 2044 Journal Article, 1995 URL

A. Salokatve, K. Rakennus, P. Uusimaa, M. Pessa, T. Aherne, J. P. Doran, J. O'Gorman, and J. Hegarty, Growth and characterization of an epitaxially grown ZnSSe/MnZnSSe distributed Bragg reflector, Applied Physics Letters, 67, (3), 1995, p407 - 409 Journal Article, 1995 TARA - Full Text

J. F. Hefferman and J. Hegarty, Effect of dispersion on the reflectivity of an asymmetric Fabry-Pérot étalon , Applied Physics Letters, 66, (4), 1995, p416 - 418 Journal Article, 1995 TARA - Full Text

Egan, A., O'Gorman, G., Rees, P., Farrell, Gerald, Hegarty, J., Phelan, P. , Frequency dependence of phase difference between synchronised self-pulsating laser emission and injected periodic signals., Electronic Letters, 31, 1995, p802 - 803 Journal Article, 1995 URL

HEFFERNAN, JF, MONOLAYER ISLANDS IN AN INTERRUPTED-GROWTH TYPE-II SINGLE-QUANTUM-WELL, 1995, - Miscellaneous, 1995

N. F. Mitchell, J. O'Gorman, J. Hegarty and J. C. Connolly, Optical bistability in asymmetric Fabry-Perot, Optics Letters, 19, (4), 1994, p269 - 271 Journal Article, 1994

P. Phelan, D. McDonald, A. Egan, J. Hegarty, R. O'Dowd, G. Farrell, and S. Lindgren, Comparison of self-pulsation in multisection lasers with distributed feedback and intracavity saturable absorbers, IEE Proceedings - Optoelectronics, 141, (2), 1994, p114 - 118 Journal Article, 1994 DOI

Andrew Jennings, Paul Horan, and John Hegarty , Optical neural network with quantum well devices,, Applied Optics, 33, (8), 1994, p1469 - 1476 Journal Article, 1994 DOI

J. F. Donegan, R. P. Stanley, J. P. Doran and J. Hegarty, Exciton dynamics in zinc-rich CdZnTe/ZnTe quantum wells , Journal of Luminescence, 58, (1-6), 1994, p216 - 222 Journal Article, 1994 DOI

John P. Doran; Fred P. Logue; T. Miyajima; Ross P. Stanley; John F. Donegan; John Hegarty, Engineering the exciton linewidth in II-VI quantum well structures, Optical Engineering, 33, 1994, p3921 - 3925 Journal Article, 1994 DOI TARA - Full Text

M. H. Moloney and J. Hegarty and L. Buydens and P. Demeester, Very low saturation densities in strained InGaAs/AlGaAs multiple quantum wells, Appled Physics Letters, 64, (8), 1994, p997 - 999 Journal Article, 1994 DOI TARA - Full Text

Mitchell, N. F.; O'Gorman, J.; Hegarty, J.; Connolly, J. C., Electro-optic modulation using asymmetric Fabry-Perot laser diode amplifiers., Applied Physics Letters, 65, (1), 1994, p7 - 9 Journal Article, 1994 URL TARA - Full Text DOI

J.P. Doran, .P. Stanley, J. Hegarty, R.D. Feldman and R.F. Austin, Polarization dependent dephasing measurements in CdxZn1‑xTe/ZnTe multiple quantum well structures, Journal of Crystal Growth, 138, (1-4), 1994, p826 - 830 Journal Article, 1994 DOI

HEGARTY, J, MITCHELL, N, HUSSEY, CD, OPTICS IN IRELAND, OPTICAL ENGINEERING, 33, 1994, 3847 - 3848 Miscellaneous, 1994

J. Xing, J. F. Donegan and J. Hegarty, A fluorescence-line-narrowing study of the broad porous-silicon luminescence band , Journal of Luminescence,, 57, (1-6), 1994, p147 - 151 Journal Article, 1994 DOI

Horan, Paul; Jennings, Andrew; Kelly, Brian; Hegarty, John, Optical implementation of a second-order translation-invariant network algorithm, Applied Optics, 32, (8), 1993, p1311 - 1321 Journal Article, 1993 DOI

Gerald Farrell. P. Phelan. J. Hegarty, J. A. Shield, All optical timing extraction with frequency division using a twin section laser diode., IEEE Photonics Technology Letters, 5, (6), 1993, p718 - 721 Journal Article, 1993 TARA - Full Text

Farrell, G.; Phelan, P.; Hegarty, J.; , The influence of the unlocked characteristics of a self-pulsating laser diode on synchronization , IEEE Photonics Technology Letters, 5, (5), 1993, p571 - 574 Journal Article, 1993 TARA - Full Text

J.P. Doran, R.P. Stanley, J.F. Donegan, J. Hegarty, R. Fischer, E.O. Gobel, R.D. Feldman, R.F. Austin, Exciton dynamics in Cd0.33Zn0.67Te/ZnTe single quantum wells , Physica B: Condensed Matter, 185, (1-4), 1993, p566 - 570 Journal Article, 1993 DOI

Phelan, P.; Farrell, G.; Hegarty, J.; , All-optical synchronization and multiplication of the frequency of mode-locked signals , IEEE Photonics Technology Letters, 4, (12), 1993, p1332 - 1335 Journal Article, 1993 DOI URL

R. P. Stanley, J. P. Doran, J. Hegarty, R. D. Feldman, LO-phonons and excitons in (Cd,Zn)Te based quantum wells, Physica B: Condensed Matter, 191, (1-2), 1993, p71 - 82 Journal Article, 1993 DOI

Moloney, M. H.; Heffernan, J. F.; Hegarty, J.; Grey, R.; Woodhead, J., Strain effect on the optical nonlinearity in an InGaAs/GaAs asymmetric Fabry-Perot modulator., Applied Physical Letters, 63, (4), 1993, p435 - 437 Journal Article, 1993 TARA - Full Text

Moloney, MH Hegarty, J Buydens, L Demeester, Grey, R Woodhead, J, Strain effects on carrier lifetimes in InGaAs/(Al)GaAs multiple quantum wells , Materials science & engineering. B, Solid-state materials for advanced technology , 21, (2-3), 1993, p253 - 256 Journal Article, 1993

M. H. Moloney and J. Hegarty, L. Buydens and P. Demeester, R. Grey and J. Woodhead, Carrier lifetimes in strained InGaAs/(Al)GaAs multiple quantum wells, Applied Physics Letters, 62, (25), 1993, p3327 - 3329 Journal Article, 1993 TARA - Full Text

Weldon, V. Phelan, P. Hegarty, J. , Methane and carbon dioxide sensing using a DFB laser diode operating at 1.64 mu m, Electronic Letters, 29, (26), 1993, p560 - 561 Journal Article, 1993 DOI

T. Asatsuma, P. Dodd, J. F. Donegan, J. G. Lunney and J. Hegarty, Er3+-doped silicon prepared by laser doping, Materials Research Society Symposium Proceedings, 301, 1993, p67 - 72 Journal Article, 1993

Phelan, P.; Farrell, G.; Hegarty, J.; , All-optical synchronization and frequency division of mode-locked pulses , IEEE Photonics Technology Letters, 4, (8), 1992, p930 - 932 Journal Article, 1992 TARA - Full Text

J.P. Doran, J.F. Donegan, J. Hegarty, R.D. Feldman and R.F. Austin, Quantum well width dependence of exciton-phonon interaction in Cd0.33Zn0.67Te/ZnTe single quantum, Solid State Communications, 81, (9), 1992, p801 - 805 Journal Article, 1992 DOI

A. Jennings, P. Horan, B. Kelly, and J. Hegarty, Asymmetric Fabry-Perot device arrays with low insertion loss and high uniformity, IEEE Photonics Technology Letters, 4, 1992, p858 - 860 Journal Article, 1992 DOI

R. P. Stanley, J. F. Donegan, J. Hegarty, R. D. Feldman and R. F. Austin, Dynamics of excitons in CdxZn1-xTe/ZnTe quantum next term wells , Journal of Luminescence, 52, (1-4), 1992, p109 - 122 Journal Article, 1992 DOI

J. P. Doran, J. F. Donegan, R. P. Stanley and J. Hegarty R. D. Feldman and R. F. Austin, Thermal broadening of excitons in CdZnTe/ZnTe single quantum wells, Journal of Crystal Growth, 117, (1-4), 1992, p465 - 469 Journal Article, 1992 DOI

G. Farrell, P. Phelan, and J. Hegarty, All-optical synchronisation with frequency division using selfpulsating laser diode, Electronic Letters, 28, (8), 1992, p738 - 739 Journal Article, 1992 DOI

Weldon, V.; Phelan, P.; Hegarty, J.; , Use of rotational sideband absorption for high sensitivity methane detection with a 1.64 mu m DFB laser , Electronics Letters, 28, (22), 1992, p2098 - 2099 Journal Article, 1992 DOI

Farrell, G.; Phelan, P.; Hegarty, J.; , All-optical clock distribution with synchronous frequency division and multiplication , Electronics Letters, 28, (15), 1992, p1387 - 1388 Journal Article, 1992 DOI TARA - Full Text

Lynch, M.; Hegarty, J.; Ginty, A.; Kelly, W. M.; Tsang, W. T., Optical measurement of ion implantation damage depth in multiple-quantum-well mesa structures, Applied Physics Letters, 59, (9), 1991, p1013 - 1015 Journal Article, 1991 TARA - Full Text DOI URL

Stanley, R. P.; Hawdon, B. J.; Hegarty, J.; Feldman, R. D.; Austin, R. F., Room-temperature exciton luminescence in II-VI quantum wells, Applied Physics Letters, 58, (25), 1991, p2972 - 2974 Journal Article, 1991 TARA - Full Text

Heffernan, J. E.; Moloney, M. H.; Hegarty, J.; Roberts, J. S.; Whitehead, M., All optical, high contrast absorptive modulation in an asymmetric Fabry-Perot etalon, Applied Physics Letters , 58, (25), 1991, p2877 - 2879 Journal Article, 1991 TARA - Full Text

J.F. Donegan, J.P. Doran, R.P. Stanley, J. Hegarty, R.D. Feldman and R.F. Austin, Resonant Rayleigh scattering from excitons in CdxZn1‑xTe:ZnTe quantum wells: measurement of homogeneous linewidths, Applied Surface Science, 50, (1-4), 1991, p321 - 324 Journal Article, 1991 DOI

Stanley RP, Hegarty J, Fischer R, Feldmann J, Göbel EO, Feldman RD, Austin RF., Hot-exciton relaxation in CdxZn1-xTe/ZnTe multiple quantum wells, Physical Review Letters, 67, (1), 1991, p128 - 131 Journal Article, 1991 TARA - Full Text URL

Farrell, G. Phelan, P. Hegarty, J. , Selfpulsation operating regime for absorber of twin section laser diode, Electronics Letters, 27, (16), 1991, p1403 - 1405 Journal Article, 1991 DOI

Heffernan, J.F. Moloney, M.H. Hegarty, J. Roberts, J.S. , Optical switching in an asymmetric Fabry-Perot with high contrast ratio and very low insertion loss , Electronic Letters, 27, 1991, p659 - 660 Journal Article, 1991 DOI

Sale, T. E. Woodhead, J. Pabla, A. S. Grey, R. Claxton, P. A. Robson, P. N. Moloney, M. H. Hegarty, J. , Bistable self-electro-optic operation of strained In0.1Ga0.9As/GaAs asymmetric Fabry-Perot modulators, Applied Physics Letters, 59, (14), 1991, p1670 - 1672 Journal Article, 1991 TARA - Full Text

R.P. Stanley, J. Hegarty, R. Fischer, J. Feldmann, E.O. Göbel, R.D. Feldman and R.F. Austin, Dynamics of free exciton luminescence in CdxZn1-xTe/ZnTe quantum wells, Journal of Crystal Growth, 101, (1-4), 1990, p683 - 686 Journal Article, 1990 DOI

O'Gorman, J. Hawdon, B.J. Hegarty, J. Heffernan, D.M. , Feedback induced instabilities in external cavity injection lasers , Electronics Letters, 25, (2), 1989, p114 - 115 Journal Article, 1989 DOI

O'Gorman, J.; Hawdon, B. J.; Hegarty, J.; Heffernan, D. M., Frequency locking and quasiperiodicity in a modulated external cavity injection laser, Journal of Applied Physics, 66, (1), 1989, p57 - 60 Journal Article, 1989 TARA - Full Text DOI URL

J. Hegarty, M. D. Sturge, Exciton localisation in quantum well structures, Surface Science, 196, (1-3), 1988, p555 - 562 Journal Article, 1988 DOI

R. P. Stanley and J. Hegarty and R. D. Feldman and R. F. Austin, Exciton line broadening in CdxZn1−xTe/ZnTe multiple quantum wells, Applied Physics Letters, 53, (15), 1988, p1417 - 1419 Journal Article, 1988 URL TARA - Full Text DOI

MITCHELL, N, FRAGMENTATION OF GALL-STONES USING PULSED LASER-LIGHT, unknown, 1988, 29, ISI Web of Science, 1988, ppA1453 - A1454 Miscellaneous, 1988

HEGARTY, J, ENHANCED INELASTIC-SCATTERING AND LOCALIZATION OF EXCITONS IN IN0.53GA0.47AS/INP ALLOY QUANTUM WELLS, 1988, - Miscellaneous, 1988

Hegarty, J, Optical dephasing in doped glasses , Journal of Luminescence , 36, (4-5), 1987, p273-281 Review, 1987 DOI

Tai, K. , Hegarty, J. , Tsang, W.T. , Observation of optical Stark effect in InGaAs/InP multiple quantum wells, Applied Physics Letters , 51, (3), 1987, p152 - 154 Journal Article, 1987 TARA - Full Text URL

J. Hegarty and M. D. Sturge,, Studies of exciton localization in quantum-well structures by nonlinear-optical techniques, Journal of the Optics Society of America B, 2, (7), 1985, p1143-1154 Journal Article, 1985 DOI

Research Expertise

Keywords

2ND-ORDER NEURAL NETWORK; ABSORPTION; ABSORPTION SPECTROSCOPY; ALGAAS; ALLOGRAFT RECIPIENTS; ANTI-D; ANTI-D IMMUNOGLOBULIN; ANTIGEN; ARRAYS; ASSOCIATION; ASSOCIATIVE MEMORIES; ASYMMETRIC FABRY-PEROT MODULATORS; B VIRUS; BETA-CHAIN; BISTABILITY; BLOOD MONONUCLEAR-CELLS; BONE-MARROW; CARBON DIOXIDE SENSORS; CARRIER; CARRIER TRANSPORT; CARRIERS; CAVITY INJECTION-LASER; CAVITY POLARITON; CAVITY POLARITONS; CD3; CD4(-)8(-); CD8 ALPHA(+)BETA(-); CELL-MIGRATION; CELLULAR NEURAL NETWORKS; CHAOS; CHIMERISM; CHIP; CHRONIC ACTIVE HEPATITIS; CIRCUITS; CIRRHOSIS; CLEARANCE; CLOCK EXTRACTION; CLOCK RECOVERY; CLOCKS; COMMUNICATION SYSTEMS; CONFINEMENT; CONFOCAL MICROSCOPY; CONTINUOUS INFUSION; CYSTIC FIBROSIS; CYTOKINE; CYTOKINE SECRETION; CYTOKINES; DECAY; DELETION DELTA-DELTA-F508; DEPENDENCE; DEVICE; DFB LASER DIODES; DFB LASERS; DIODE; DIODE-LASER; DIODE-LASERS; DIRECT-VIEW MICROSCOPY; DISPERSION; DISTRIBUTED FEEDBACK LASER DIODES; DISTRIBUTED FEEDBACK LASERS; DISTRIBUTED-BRAGG-REFLECTOR; DOPED FLUOROZIRCONATE FIBER; DYNAMICS; EMISSION; EPITAXIAL-GROWTH; EPITAXY; EXCITON TRANSFER; EXCITONS; EXPERIMENTAL AXIAL RESPONSE; EXPRESSION; EXTENDED TUNING RANGE; FABRICATION; FIBRE BRAGG GRATING; FIBRE LASER; FIBRE OPTICAL SENSORS; FLUORESCENCE; FREQUENCY; FREQUENCY RESPONSE; FREQUENCY-DIVISION; GAAS; GAIN; GAIN SPECTRA; GALLIUM ARSENIDE; GALLIUM NITRIDE; GAMMA DELTA TCR; GAMMA-DELTA; GAS; GAS SENSING; GAS SENSOR; GAS SENSORS; GREEN LASER-DIODE; GREEN LASER-DIODES; GREEN LIGHT EMITTERS; HEPARIN; HEPATIC VENOOCCLUSIVE DISEASE; HETEROSTRUCTURES; HIGH BRIGHTNESS; HIGH CONTRAST; HIGHER-ORDER NETWORKS; HOT-ELECTRON TRANSFER; HUMAN LIVER; HYDROGEN SULFIDE SENSORS; II-VI SEMICONDUCTORS; IMMUNE-RESPONSES; INDEX CHANGE; INDUCTION; INJECTION; INSERTION LOSS; INTERLEUKIN-10; INTRAEPITHELIAL LYMPHOCYTES; LASER; LASER DIODE; Laser technology; LASER-DIODE; LASER-DIODES; LASERS; Lasers and Masers; LATERAL INHIBITION; LIFETIME; LIGHT BUDGET; LIGHT EMISSION; LIGHT-EMISSION; LIGHT-EMITTING DIODES; LINE-SHAPES; LINEWIDTH; LINEWIDTHS; LITHOGRAPHY; LIVER DISEASE; LOCALIZATION; LONGITUDINAL MODE CONTROL; LOW INSERTION-LOSS; LOW-VOLTAGE; LUMINESCENCE; LYMPHOCYTES; MESFETS; METHANE; METHANE DETECTION; MHC; MICE; MICROCAVITY; MODEL; MODULATION; MODULATORS; MOLECULAR-BEAM EPITAXY; MOLECULAR-BEAM-EPITAXY; MULTIPLE QUANTUM WELLS; MUTATION; N-TYPE; NEGATIVE DIFFERENTIAL RESISTANCE; NEURAL NETWORK; NEURAL NETWORKS; NOISE; NONLINEARITIES; OE-VLSI; OPTICAL CLOCK EXTRACTION; OPTICAL COMMUNICATIONS; OPTICAL IMPLEMENTATION; OPTICAL INTERCONNECTS; OPTICAL MODULATORS; OPTICAL NEURAL NETWORKS; OPTICAL SECTIONING STRENGTH; OPTICAL-COMPONENTS; OPTIMIZATION; OPTOELECTRONICS; P-TYPE ZNSE; PERIPHERAL-BLOOD; PHOTOLUMINESCENCE; POPULATIONS; PREVENTION; QUANTUM-WELL DEVICES; QUANTUM-WELLS; RADIATIVE RECOMBINATION; RATIO-GREATER-THAN-100-1; RECEPTOR-ALPHA/BETA(+) CELLS; REFLECTION MODULATOR; REFLECTION MODULATORS; RELAXATION; RESONANCE RAMAN-SCATTERING; RISK-FACTORS; ROOM-TEMPERATURE; SELF-LINEARIZED SEED; SELF-PULSATING DIODES; SELF-PULSATION PHYSICS; SELF-PULSATION SYNCHRONISATION; SEMICONDUCTOR LASER DIODES; SEMICONDUCTOR LASERS; Semiconductor optoelectronics; Semiconductor physics and technologies; SEMICONDUCTOR-LASERS; SEMICONDUCTORS; SINGLE-FREQUENCY LASER DIODE; SMART-PIXELS; SPECTROSCOPY; SPONTANEOUS EMISSION; SUPERLATTICES; SUSTAINED PULSATION; SYNCHRONIZATION; T-CELL DIFFERENTIATION; TEMPERATURE; TRANSISTOR; TRIAL; VENOCCLUSIVE DISEASE; VOLTAGE; WAVEGUIDE; WAVELENGTH MODULATION SPECTROSCOPY; WELL SEMICONDUCTOR-LASER; ZNSE

Recognition

Representations

Co-Founder and Director of Optronics Ireland 1989-2000

Coordinator of European Consortium on Microcavities 1993-2000

Member of National Research Support Fund Board 1995-1998

Member of the Higher Education Authority (HEA) 1998-2001

Member of the Science Foundation Ireland Technical Advisory Panel on Information and Communications Technology 2000-2001

Chair of the Deans/Vice Presidents for Research under CHIU 2000

Awards and Honours

Fellow of Trinity College Dublin

Fellow of the Institute of Physics

Memberships

Member of the American Physical Society

Member of the American Optical Society

Member of the Institute of Electronic and Electrical Engineers

Member of the Royal Irish Academy