This presentation unveils recent photonic crystal research with two main topics. Firstly, we showcase efficient narrow-band infrared thermal emitters achieved by intersubband transitions in multiple quantum wells (MQWs) paired with photonic-crystal resonance. Our breakthrough enables dynamic control of narrowband thermal emission, vital for compact and energy-efficient spectroscopic sensing systems. Secondly, we present high Q factor SiC photonic crystal nanocavity research, addressing challenges and solutions for achieving superior Q factors. This innovation holds potential for optimizing optical cavity performance. Shifting focus, we spotlight projects from the Korea Institute of Science and Technology's Center for Quantum Information. These projects include diamond NV center-based quantum technologies like spin-qubit control, diamond nanophotonics, and bright NV centers.

Dongyeon Daniel Kang earned his B.S. degree in Electrical Engineering from Kyoto University in Japan and later completed his Ph.D. in Electronic Science and Engineering in 2018. His academic journey led him through diverse roles in Prof. Susumu Noda's laboratory, from an undergraduate to a graduate student and then a postdoctoral researcher. His focus was on developing photonic crystal optical/optoelectronic devices for thermal emission control and optical cavity enhancement. Following his postdoctoral work at the Institute for Quantum Computing and Electrical and Computer Engineering, University of Waterloo, he joined Samsung Electronics, contributing to the development of nano-scale CMOS image sensors. Presently, as a senior researcher at the Center for Quantum Information in Korea Institute of Science and Technology, he delves into the study of spin-photon interfaces with NV centers in diamond.