Our research focuses on thermal radiation control using advanced optical materials and structures, enabling applications across diverse fields such as radiative cooling, thermophotovoltaic (TPV), low emissivity (Low-E) coatings, and thermal imaging. By utilizing perovskite metal oxides with exceptional thermal stability, we have demonstrated their robust performance even under high-temperature and oxygen-rich environments. Additionally, we have developed thermal emitters specifically designed for near-infrared radiative heat control. Furthermore, our team is actively researching transparent and camouflaged thermal imaging technologies that remain invisible in the visible spectrum yet detectable via thermal cameras, utilizing innovative transparent optical structures.

On-chip optical modulators, which encode electronic data onto optical signals to generate single or multiplexed signals and enable electro-optical and opto-electrical signal conversions, are critical components in photonic integrated circuits (PICs). The development of advanced materials with superior properties compared to existing materials holds significant potential to bridge the technological gap with leading global research groups. Our research team is dedicated to advancing high-performance on-chip optical signal modulation technologies through the epitaxial growth of barium titanate (BTO) thin films with outstanding electro-optic properties, alongside the development of cutting-edge devices such as single-sideband modulators and FSR Mach-Zehnder interferometers.

The growing demand for photodetection, with applications in fields such as biomedical imaging, gas sensing, energy conversion, and optical communication, has sparked significant interest in the development of cost-efficient photodiodes. In particular, recent advances in integrated silicon (Si) photonics, predominantly operating within telecommunication wavelengths, have intensified the focus on NIR photodetection within the Si platform.  Our research team has developed Si-based sub-bandgap photodetection technology by controlling interface defects between transparent oxide thin films and Si, as well as optimizing light absorption in ultra-thin Au films (below 10 nm). Additionally, we are developing UV and visible photodetectors based on perovskite oxide and Ga₂O₃ thin films.