Speaker：Dr. SHEN Chao,Photonics Laboratory, KAUST

Time：2：00p.m.June 29th,2016

Place：A320,SINANO

Abstract:

The unregulated visible light spectrum has recently been harnessed for energy-efficient, ultra-large bandwidth, and secure data transmission. For advancing the high-power, high-speed light-emitter architecture, we present the compact and energy saving laser-diode based devices for free-space and underwater visible light communication (VLC), in place of LEDs. The presentation features our recent investigations: 1) A small footprint integrated waveguide-modulator / laser-diode (IWM-LD) on semipolar GaN substrate, showing a high modulation efficiency of 2.68 dB/V and a -3dB bandwidth of ~1 GHz. 2) Vertical-cavity surface-emitting lasers (VCSELs) based on nonpolar InGaN/GaN quantum-wells and a tunnel-junction intracavity contact for VLC. 3) A semipolar InGaN-based blue-emitting superluminescent diode (SLD) as a droop-free and speckle-free light source, combining the advantages of both LEDs and LDs. 4) Novel single-crystal YAG and perovskite based phosphor material for white light VLC. Finally, the research overview, facilities, and opportunities at KAUST-KACST-UCSB Solid-State Lighting Program will be introduced.

Bio:

Chao is a final year PhD candidate at King Abdullah University of Science and Technology (KAUST). He is also affiliated with KACST Technology Innovation Center (TIC) for solid-state lighting at KAUST and KACST-KAUST-UCSB Solid-State Lighting Program (SSLP). Currently, he has co-authored 13 journal papers, including Optics Express, Optics Letters, ACS Photonics, Nano Letters, etc. In addition, he published 12 conference papers, such as CLEO, IPC, and ICNS, and has two US patents pending. He received BSc. in Materials Physics at Fudan University. Chao is a student member of IEEE Photonics Society, IEEE Electron Device Society, and OSA.