Near-Infrared Colloidal Quantum Dots Lasers
| Dates: | 9 November 2022 |
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| Times: | 12:00 - 13:00 |
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| What is it: | Seminar |
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| Organiser: | Photon Science Institute |
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| Who is it for: | University staff, Current University students |
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| Speaker: | Dr. Guy Whitworth |
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Join us for this PSI seminar with guest speaker Dr. Guy Whitworth. Solution-processed semiconductor lasers have achieved much success across the nanomaterial research community. The ease of integration with other photonic components and the potential for upscaling using emerging large-area fabrication technologies (such as roll-to-roll) make these lasers attractive as low-cost photonic light sources that can find use in a variety of applications, including: integrated photonic circuitry, telecommunications, chemo-/bio-sensing, security and lab-on-chip experiments. However, room-temperature solution-processed lasers in the near-infrared telecommunication bands for fiber-optic communications and eye-safe LIDAR applications had remained unrealised prior to this work. In this talk, I will present our work with PbS colloidal quantum dot distributed feedback lasers, where we have demonstrated tunable lasing between 1.55??m to 1.65??m. Additionally I will present studies we have made on ways to reduce the lasing threshold of these devices and the current work we are perusing on core-shell heterostructures.
Speaker
Dr. Guy Whitworth
Organisation: ICFO Institute of Photonic Sciences, Barcelona
Biography: Dr. Guy Whitworth obtained his MPhys in Physics from the University of Southampton in 2012 and went on to obtain his PhD in at the University of St Andrews in 2016, working in the Organic Semiconductor Centre. His PhD thesis entitled “Nano-Engineered Solution Processed Solid-State Seimconductor Lasers” focused on the advancement of conjugated polymer lasers and pioneered the first perovskite distributed feedback lasers. In 2017, he moved to Spain to work at The Catalan Institute of Nanoscience and Nanotechnology (ICN2) to develop a new optical inspection technique for in-line nanofabriacation, and in 2019, he moved to The Institute of Photonic Sciences (ICFO), also in Barcelona. Currently he works with novel infrared quantum dots and has fabricated the very first lasers using Pb-chalcoganide quantum dots (see https://doi.org/10.1038/s41566-021-00878-9).
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