Wavelength selective thermal emitters using nitride quantum wells and photonic crystals
Dr. Dongyeon Daniel Kang, Kyoto University
Wavelength selective thermal emitters are highly desired for the development of the compact/energy-efficient spectroscopic sensing systems capable of detecting various gases such as COx, CH4, and NOx, which are strongly needed in environmental science, medical care, and other industrial applications. In addition, for the latter applications, dynamic control of thermal emission intensity is important for such emitters because synchronous detection can increase the signal-to-noise ratio significantly.
Our recent studies demonstrated that efficient narrow-band infrared thermal emitters can be realized by using intersubband-transitions in multiple quantum wells (MQW) and the photonic-crystal band-edge resonant effect, where the electronic and photonic states are successfully controlled and unnecessary thermal emission is substantially suppressed by employing GaN/AlGaN MQWs and photonic crystals. Furthermore, we achieved the demonstration of dynamic control of narrowband thermal emission by modulating the electron density in the MQWs.
Note: A light lunch will be available at 1:00pm. The seminar will begin at 1:15pm.