PhD Position in Photonics. multi-color lasers for mm-wave all-optical processing applications.

Updated: 30 days ago
Job Type: FullTime
Deadline: 31 May 2021

Multi-color lasers, i.e., lasers with the capability to emit simultaneously at multiple wavelengths, open exciting perspectives for a wide range of applications, from optical sensing to data-communication or mm-wave and THz all-optical processing. Combined with the outstanding and continuous progress of generic foundry platforms making Photonic Integrated Circuits (PIC) widely available, it is now possible to design multi-color lasers specifically tailored for various applications. The main bottleneck of this development is the difficulty to finely control multi-color lasers. In short, depending on the internal mechanism, these lasers can either be versatile but extremely sensitive, or robust but without any practical control parameter. Yet, we recently proposed a new technique based on phase-controlled optical feedback which showed great promises. We were able to induce a complete wavelength switch in a two-color laser with a suppression ratio up to 50 dB. Moreover, the feedback cavity can be monolithically integrated on the same chip as the laser, hence ensuring a low footprint of the complete system.

Now, in the frame of a Starting Grant from the European Research Council: ERC-StG-2020 project COLOR’UP (https://b-phot.org/research/european-research-council/color-up ), we want to focus on the dynamics of multi-color lasers and investigate how they could be exploited for processing exploited for all-optical processing of mm-wave and THz signals. In this context, we are looking for an excellent PhD candidate in photonics (duration = 48 months) to join our team. The research work will therefore include:

  • Design and simulation of novel multi-color laser structures compatible with the constraints of the generic foundry platform
  • Testing, validation, and detailed characterization of the photonic ICs (PICs)
  • Development of new solutions to improve the current feedback-based control technique to achieve complete and precise control of multi-color lasers.
  • Investigations of the impact of feedback on the laser dynamics and mode competition.
  • Identification of processing capabilities and development of a demonstrator.

The candidate will join the Brussels Photonics (B-PHOT) research group of the Vrije Universiteit Brussel (VUB) in Belgium, www.b-phot.org . Chaired by Prof. H. Thienpont, the team composed of more than 45 internationally recognized researchers is widely known for its work in fundamental and applied photonics research covering the entire research cycle from modelling and fabrication, to characterization and Proof-Of-Concept. In the last 20 years, the group has built significant expertise in the field of semiconductor laser – including modelling, design and on-chip implementation of new laser structures – but also in nonlinear dynamics and chaos-based applications. The candidate will therefore have the opportunity to contribute to the field in a vivid and fruitful environment.

Starting date: September – October 2021.

For more information, please contact Prof. M. Virte (martin.virte@vub.be ) or Dr. P. Marin-Palomo (pablo.marin-palomo@vub.be ).

To apply, please send your detailed CV (including a copy of the Master diploma and a Transcript of records), letters of recommendation, any supporting documents demonstrating technical skills (theses or scientific papers), and an application letter to Prof. M. Virte (martin.virte@vub.be ) by e-mail before May 15th , 2021.

If no suitable candidate has been found after the deadline, the position will remain open until it is filled.

If your application is selected based on the CV and accompanying documents, you will be invited for a teleconference interview and online tests.

References:

PhD Thesis of Robert Pawlus (joint PhD between VUB and TU Darmstadt): https://tuprints.ulb.tu-darmstadt.de/11917/1/Dissertation_RPawlus.pdf

Pawlus et al., "dual-wavelength lasers on generic foundry platform", https://arxiv.org/abs/1911.03533

R Pawlus, R de Mey, S Breuer, M Virte, "Control of dual-wavelength laser using monolithically integrated phase-controlled optical feedback" - Semiconductor Lasers and Laser Dynamics IX, 2020


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