16 April 2019 Abdullah Demir


Speaker: Abdullah Demir, UNAM
Title: Semiconductor Lasers: Can we overcome the limitations using novel architectures?
Date: April 16, 2019
Time: 14:30
Cookie & Tea: SCI 103, 14:15
Place: SCI 103
web: https://physics-seminars.ku.edu.tr/

Semiconductor lasers have developed significantly in the last few decades as key components in industrial and consumer applications mainly due to their small size, performance, and electronic integration. Emerging and future applications need further improvements in these features, but fundamental limitations hinder advancements and require fundamental studies and innovative approaches. In this talk, I will present novel architectures in semiconductor lasers to address these needs. I will discuss the output power limitation mechanisms and demonstrate our experimental results showing significant improvement of the laser output by using gain and photon profile engineering. Using a multi-section waveguide approach, we realized facet cooling in high power semiconductor lasers, which is key for improved operating performance and reliability. I will also demonstrate a new micro-laser fabrication method we developed to overcome the restrictions and problems of the current technology and present our efforts towards nanoscale lasers.

Short Bio: Dr. Abdullah Demir is a faculty member in the Bilkent University – National Nanotechnology Research Center (UNAM) where he is the director of the Nanophotonic Devices Laboratory (nanoPhD Lab). He received his B.S. in Physics and M.S. in Computational Science from Koç University and completed his Ph.D. in Optics from CREOL at University of Central Florida. He worked in R&D groups of semiconductor laser companies (JDSU and Lumentum) in the USA. He moved to Turkey and worked as a research associate in the Physics Department of Bilkent University in 2016-17 before joining UNAM. His research interests are nanophotonic devices, semiconductor lasers, high power laser diodes, VCSEL, quantum cascade lasers, nanoscale light sources. He is the recipient of JDSU Zenith Award (2014) and European Commission Marie Curie Individual Fellowship (2017).