Student Lecture Series: Dec. 4th

Robert Zhang
Bowers Group
​UCSB Electrical Engineering

Unidirectional spontaneous emission from emitting metasurfaces

​Optical metasurfaces --- strategically engineered subwavelength surface structures --- have emerged as an extremely versatile and compact means of manipulating the spatial and polarization structure of an incident beam of light. Critically, the functionality of such metasurfaces depends upon the existence of a well-defined input-phase, i.e., the incident beam. In this talk, I demonstrate the possibility of applying optical metasurface concepts to the spontaneous emission process, thereby generating unidirectional and variable emission from III-V quantum-well structures. 

​​Ryan DeCrescent
Schuller Group
​UCSB Physics

​Gain Characterization of p-doped 1.3 μm InAs Quantum Dot Lasers on Silicon 

​We investigate, both experimentally and theoretically, the gain characteristics of modulation p-doped 1.3 μm quantum dot lasers epitaxially grown on silicon. The inhomogeneous broadening is extracted to be 10 meV. A p-doped quantum dot active region has been found to show lower transparency current and higher material gain. 

Tuesday Dec. 4th at 12:30 pm in ESB 1001
Pizza will be provided!

This is the start of the weekly student lecture series IEEE Photonics is hosting throughout Winter 2019!  Ryan DeCrescent and Robert Zhang will be presenting their talks.