Bending, Trapping, and Slowing Down Light Beams for Highly-Efficient and Ultra-Fast Detection


Bending, Trapping, and Slowing Down Light Beams for Highly-Efficient and Ultra-Fast Detection

Hosted By: Photonic Detection Technical Group

19 August 2019, 14:00 - 15:00

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Photon absorption is generally very weak in most semiconductors when incident photon wavelengths are close to their optical band gap. This leads to weak absorption coefficients requiring considerably thick films for efficient light absorption. Photodetectors designed with thick absorption region cannot operate at high-speed due to long carrier drift-time. Emerging 2D materials with ultra-short photon interaction time are impractical for photodetection, because of low absorption efficiency, despite their ultra-fast response time.

In this webinar hosted by OSA Photonic Detection, Professor Saif Islam of University of California, Davis will demonstrate coupling of normally incident beams of light into laterally propagating modes along the plane of semiconductor films by using a periodic array of micro and nanoscale holes. Such holes, with dimensions close to the wavelength of light, bend and slow down light, thereby contributing to more than an order of magnitude improvement in the light absorption efficiency of photodetector even when designed with thin absorption regions. The presenter will demonstrate this by applying the technique of photon trapping to silicon and germanium. 

What You Will Learn:

  • Design of next generation photodetectors that utilize 2D materials, introduction to photonic crystals, and performance comparison of different photodetectors for various  applications including LiDAR

Who Should Attend:

  • Researchers
  • Engineers
  • Students in the photodetection field


About the presenter(s):

M. Saif Islam, UC Davis


M. Saif Islam received his B.Sc. Degree in Physics form Middle East Technical University (1994, Turkey), M.S. degree in Physics from Bilkent University (1996, Turkey) and Ph.D. degree in Electrical Engineering from UCLA in 2001. He worked for JDS Uniphase Corp., Gazillion Bits, Inc. and HP Labs. M. Saif joined University of California, Davis in 2004, were he is a professor and Chair of the ECE department. He has authored and co-authored more than 250 scientific papers, organized 30 conferences and symposiums as a co-Chair; holding 41 patents as an inventor/co-inventor. M. Saif received NSF Faculty Early Career Award, Outstanding Junior Mid-Career Research Faculty Award, IEEE Professor of the Year and UC Davis Academic Senate Distinguished Teaching Award. He is an elected fellow of the AAAS, OSA, SPIE, and National Academy of Inventors (NAI).