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
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
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
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
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
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-
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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 ]
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
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
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
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. ]
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
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
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]
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
Kakizaki, Sunao; Horan, Paul; Hegarty, John., Surface-normal cascaded planar interconnection with easy alignment, Optics Letters, 20, (22), 1995, p2294 - 2296
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
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
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
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
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.]
K. Fobelets, G. Borghs and J. Hegarty. , Experimental drain current drop-back in. GaAs MESFETs., Electronic Letters, 31, 1995, p2042 - 2044
HEFFERNAN, JF, MONOLAYER ISLANDS IN AN INTERRUPTED-GROWTH TYPE-II SINGLE-QUANTUM-WELL, 1995, -
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
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
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
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
HEGARTY, J, MITCHELL, N, HUSSEY, CD, OPTICS IN IRELAND, OPTICAL ENGINEERING, 33, 1994, 3847 - 3848
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
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
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
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
Andrew Jennings, Paul Horan, and John Hegarty , Optical neural network with quantum well devices,, Applied Optics, 33, (8), 1994, p1469 - 1476
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
G. Farrell, P. Phelan, and J. Hegarty, All-optical synchronisation with frequency division using selfpulsating laser diode, Electronic Letters, 28, (8), 1992, p738 - 739
Farrell, G.; Phelan, P.; Hegarty, J.; , All-optical clock distribution with synchronous frequency division and multiplication , Electronics Letters, 28, (15), 1992, p1387 - 1388
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
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
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
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
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
Farrell, G. Phelan, P. Hegarty, J. , Selfpulsation operating regime for absorber of twin section laser diode, Electronics Letters, 27, (16), 1991, p1403 - 1405
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
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
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
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
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
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
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
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
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
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
J. Hegarty, M. D. Sturge, Exciton localisation in quantum well structures, Surface Science, 196, (1-3), 1988, p555 - 562
MITCHELL, N, FRAGMENTATION OF GALL-STONES USING PULSED LASER-LIGHT, unknown, 1988, 29, ISI Web of Science, 1988, ppA1453 - A1454
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
HEGARTY, J, ENHANCED INELASTIC-SCATTERING AND LOCALIZATION OF EXCITONS IN IN0.53GA0.47AS/INP ALLOY QUANTUM WELLS, 1988, -
Hegarty, J, Optical dephasing in doped glasses , Journal of Luminescence , 36, (4-5), 1987, p273-281
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
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
Research Expertise
Recognition
Representations
Co-Founder and Director of Optronics Ireland
Coordinator of European Consortium on Microcavities
Member of National Research Support Fund Board
Member of the Higher Education Authority (HEA)
Member of the Science Foundation Ireland Technical Advisory Panel on Information and Communications Technology
Chair of the Deans/Vice Presidents for Research under CHIU
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