People
Deep ultraviolet to visible photonic devices with high-contrast subwavelength periodic structure
TAKASHIMA Yuusuke[Assistant Professor]
Division of Next-generation Photonics (Joint Faculty)
2016- JSPS research fellowship (DC2)
Tokushima University, Japan, Dr. Eng, 2017
2017- JSPS research fellowship (PD)
2018- Research fellow, Tokushima Univ.
2019- Assistant professor, Graduate School of Technology, Industrial and Social Sciences, Tokushima Univ.
2021- Assistant Professor, Institute of Post-LED Photonics, Tokushima Univ.
- Medical Photonics
- Visible
- Infrared
- Terahertz
- Deep ultraviolet
- Information Technology
- Medical
- Inspection
- Light source / Sensing
- etc.
- nano structure
- visible light
- ultraviolet
- optrical sensing
- Light-emitting diode (LED)
Research Interests
Photonic devices with subwavelength periodic structure (SWS) were developed for deep ultraviolet (DUV) to visible (VIS) wavelength region.
The periodic and abrupt refractive index (RI) contrast of the SWS induces optical eigenmodes, and the modes interacts with the light. Owing to the interaction, optical properties of SWS, such as transmission, reflection and absorption, can be artificially controlled via adjusting its structural dimensions, and this provides new photonic device platform.
Utilizing the designed SWSs, we have already realized many unique DUV to VIS wavelength applications, such as RI sensor incorporating on the GaN-based blue-LED, optical detection for magnetic field (Fig. 1), very high efficiency RGB color filters, very thin high reflective DUV mirror and collimating AlGaN-based 280 nm DUV-LED (Fig. 2).
In the further work, we plan to apply our SWS devices for medical applications, such as photo-sterilization, virus detection, and bio-imaging.
