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Open Positions

 

There are two Post-doctoral researcher positions available in the Donegan Photonics group in TCD. Applications are invited for post-doc positions in the 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 110 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/ 

Project 1: “photonic integrated plasmonic devices for recording applications”


Project Description

Plasmonics has shown how to bring light from the micron scale structure of dielectric waveguides to the nanoscale structures that are used in plasmonic devices. A key technology developed from this field of research is heat-assisted-magnetic-recording (HAMR) in which a plasmonic near-field-transducer (NFT) excited by a laser through a dielectric waveguide is used to raise the temperature of a magnetic media containing FePt above its Curie temperature of about 650 K. The NFT ensures that the heating spot on the media excites a spot of about 50 nm x 50 nm which results in a writing density above 1 TB/in2. The Donegan group has been working with Western Digital on various degsins of NFT to achieve this density while reducing the power needed from the pump laser and crucially reducing the temperature of the NFT itself. Working with ASRC, the group has shown structures in Au and its alloys that ensure that temperature rises in the NFT are kept below 400 K, crucial for the long-term stability of the NFT. Very recently, the group has also shown that spin-transfer torque can be used to further enhance the magnetic recording process. The project will feature novel designs of NFT structures for recording in ferroelectric and optical media. Work will also take place on using arrays of plasmonic NFTs to greatly enhance the storage efficiency.  Work will begin with new designs and will follow with fabrication using the various facilities including e-beam fabrication available in the CRANN research centre. Integration of the laser/waveguide/NFT is a key goal. A further research goal for this project is design of novel structures that can handle a high power density, this will require expertise not only in optical but also in thermal modelling.

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 under the AMBER Research Centre.

Post-doctoral position:

Salary up to €55,732 depending on experience (4-5 years post PhD and including pension contribution) must be an expert in plasmonic device fabrication. Clearly, we will seek a researcher with strong experience in the design of photonic and plasmonic devices.  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,and the names and contact details of two academic referees to Professor John Donegan jdonegan@tcd.ie with subject heading “photonics positions plasmonics TCD”. Appointment to commence late 2019.

 

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 les than 50 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 burst-mode operation will also be researched. We will also continue our research on simple widely tunable Vernier designs that show ease of fabrication.  We will further develop techniques that will allow us to map the temperature profile within semiconductor lasers to allow for improved athermal performance. This new platform of semiconductor laser devices will deliver for Ireland with impacts in the area of optical communications and optical sensors. 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. 

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 under its PI programme.

Post-doctoral position:

Salary up to €55,732 depending on experience (4-5 years post PhD and including pension contribution) 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 devices working with an external foundry.  They will also supervise the characterisation of the fabricated devices along with the graduate students working on this project.

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,and the names and contact details of two academic referees to Professor John Donegan jdonegan@tcd.ie with subject heading “photonics positions laser TCD”. Appointment to commence late 2019.