Skip to main content

Trinity College Dublin, The University of Dublin

Trinity Menu Trinity Search



You are here Research > Research Groups > Semiconductor Photonics Group > Open Positions

Open Positions

All these positions have now been filled

Project 1: “development of an on-chip optical frequency synthesizer”

Project Description

With the help of a self-referenced optical frequency comb (OFC), optical frequencies can be controlled to the same precision as microwave frequencies. Currently self-referenced OFC systems are only available through bench-top setups such as a combination of femtosecond pulsed lasers, EDFAs, and highly nonlinear optical fiber. The whole setup is bulky, expensive and sensitive to environment changes. There is strong interest to miniaturize the whole setup to chip-scale so that a highly accurate optical frequency source would be cheap and easily available for applications such as a chip-scale optical clock, high spectral efficiency optical communications, and LiDAR. It could be realized now due to the development of photonic integration technology. In this project, a low-linewidth high-power tunable semiconductor laser for pumping will be developed at Huazhong University of Science and Technology (HUST). At Trinity College Dublin (TCD), high quality SiN microcavities for OFC generation will be developed. Both sides will then work together to co-package the pumping laser with the microcavity chip, the frequency doubling chip, low noise photodetectors, and all electronic components for frequency reference and locking. A chip sized optical frequency synthesizer with accuracy down to the Hertz level is our project aim. 
Applications are invited for a post-doc position and two four-year PhD studentships in Photonics group led by Professor John Donegan in the School of Physics, Trinity College Dublin. Successful applicants will join a vibrant community of students and postdoctoral researchers.  Trinity College Dublin, the University of Dublin is ranked 1st in Ireland and in the top 100 world universities by the QS World University Rankings. Further information on the group can be found at https://www.tcd.ie/Physics/research/themes/photonics/ 

These studies will provide an excellent base for a career both in academia and in high-value industry. The research is funded by Science Foundation Ireland for the work in Ireland and by National Science Foundation of China for the work in China.

PhD Studentships:
Stipend: €18,000 per annum for 4 years in addition to tuition fees. 
Funding is available for Irish and EU students.
International applicants with full funding are welcome to apply. Proof of funding will be required at application stage. 
The successful candidates will be highly self-motivated and have a first class or upper-second class honours degree from an Irish university, or an equivalent from another country, in Physics, Theoretical Physics, Material Science or Nanoscience, with a strong interest in photonic devices. A M.Sc. in a related area would be an advantage. A high level of written and oral communication skills in English is essential.

Graduate student one will work on integrated microring resonantors in SiN materials looking at structures that produce quality factors about 106 and have low loss.
Graduate student 2 will work on the injection locking of a 2 micron laser which will be developed by our collaborators in China. We need to characterize the laser and develop a robust injection locking technique that could stably lock the laser for a long time.

 

Post-doctoral position:

Salary upto €58371 depending on experience (4-5 years post PhD) must be an expert in semiconductor device fabrication. Clearly, we will seek a researcher with strong experience in the design of photonics devices. A key research goal for this project is to produce SiN microcavity structures with quality factors about 106, this will require very careful precise fabrication and use of the suite of fabrication tools available in CRANN. It is clear that innovations in SiN and other materials must be delivered as part of the project. Expertise in device designs, in e-beam lithography, in etching will be essential, with experience in optical lithography also a bonus.

Candidates for this post-doc position must have a PhD in Physics or Electronic Engineering and have had experience of modelling and fabrication during their PhD programmes.

How to Apply
Prospective candidates should send a detailed CV, a covering letter outlining their educational background, research interests and motivations, transcript of your marks if available, and the names and contact details of two academic referees to Professor John Donegan jdonegan@tcd.ie with subject heading photonics positions TCD.
Funding is available from January 2018 but this can be flexible to the timetable of the successful candidate.  
All applicants whose first language is not English and who have not been educated through the medium of English must present one of the following qualifications in the English language to be eligible for registration in the University:

  • IELTS: Grade 6.5 overall
  • TOEFL: 88 internet-based, 570 paper-based, 230 computer-based
  • University of Cambridge: 
    Proficiency Certificate, Grade C or better (CEFR Level C1 or C2) 
    Advanced Certificate, Grade C or better (CEFR Level C1 or C2) 
  • Pearson Test of English (Academic) - PTE Academic: a minimum score of 63 to be eligible (with no section score below 59)

Please note that test scores are only valid for 2 years.


There are currently PhD and Post-doctoral researcher positions available in the Donegan Photonics group.

Project 2: “Athermal semiconductor lasers for applications in information and communications technologies ”

Project Description

The semiconductor laser is a highly efficient photonic device which is the basis for wired optical networks. The device has allowed the very rapid growth in internet traffic with rates upto 20%/yr for VOIP and data centres. While very efficient, most lasers require active cooling to control the power but more importantly, the wavelength of the laser. For DWDM applications, the laser must remain within its channel in a range of only 40 GHz. The Donegan group has developed a laser platform based on high-order surface gratings that show ease of fabrication and exhibit high yield. In this project, we will demonstrate the development of athermal laser performance in this laser platform. The project will feature novel designs that incorporate AWG structures, multi-contact structures that incorporate materials with negative thermo-optic behaviour. Laser designs for heat-assisted magnetic recording will also be developed. This new platform of semiconductor laser devices will deliver for Ireland with impacts in the area of optical communications and magnetic recording. It is anticipated that several patents will be generated from this research which will be licensed to photonic companies within Ireland making a direct impact on the knowledge economy in Ireland. 
Applications are invited for a post-doc position and two four-year PhD studentships in Photonics group led by Professor John Donegan in the School of Physics, Trinity College Dublin. Successful applicants will join a vibrant community of students and postdoctoral researchers.  Trinity College Dublin, the University of Dublin is ranked 1st in Ireland and in the top 100 world universities by the QS World University Rankings. Further information on the group can be found at https://www.tcd.ie/Physics/research/themes/photonics/ 

These studies will provide an excellent base for a career both in academia and in high-value industry. The research is funded by Science Foundation Ireland.

PhD Studentships:
Stipend: €18,000 per annum for 4 years in addition to tuition fees. 
Funding is available for Irish and EU students.
International applicants with full funding are welcome to apply. Proof of funding will be required at application stage. 
The successful candidates will be highly self-motivated and have a first class or upper-second class honours degree from an Irish university, or an equivalent from another country, in Physics, Theoretical Physics, Material Science or Nanoscience, with a strong interest in photonic devices. A M.Sc. in a related area would be an advantage. A high level of written and oral communication skills in English is essential.

Graduate student 1 will work on the laser structures for heat assisted magnetic recording (HAMR) devices and also devices for passive optical networks. Here we focus on the development of a laser structure that will be expected to have a variety of feedback levels that will influence both the dynamics and the temperature of the laser. Graduate student 2 will work on thermal imaging techniques to understand heat flow process in both our standard designs and in the newer devices produced in this project.

Post-doctoral position:

Salary upto €49358 depending on experience (3-4 years post PhD) must be an expert in semiconductor laser design and fabrication. Clearly, we will seek a researcher with strong experience in the design of photonics devices. The post-doc will need strong expertise in translation of device designs into fabricated devics working with the external foundry.  They will also supervise the characterisation of the fabricated devices along with the graduate students.

Candidates for this post-doc position must have a PhD in Physics or Electronic Engineering and have had experience of modelling and fabrication during their PhD programmes.

How to Apply
Prospective candidates should send a detailed CV, a covering letter outlining their educational background, research interests and motivations, transcript of your marks if available, and the names and contact details of two academic referees to Professor John Donegan jdonegan@tcd.ie with subject heading photonics positions TCD.
Funding is available from April 2018 but this can be flexible to the timetable of the successful candidate.  
All applicants whose first language is not English and who have not been educated through the medium of English must present one of the following qualifications in the English language to be eligible for registration in the University:

  • IELTS: Grade 6.5 overall
  • TOEFL: 88 internet-based, 570 paper-based, 230 computer-based
  • University of Cambridge: 
    Proficiency Certificate, Grade C or better (CEFR Level C1 or C2) 
    Advanced Certificate, Grade C or better (CEFR Level C1 or C2) 
  • Pearson Test of English (Academic) - PTE Academic: a minimum score of 63 to be eligible (with no section score below 59)

Please note that test scores are only valid for 2 years.