Researcher's Information

Professor

NUMAI, Takahiro

Electrical and Electronic Engineering

*Unable to accept new Doctoral students from September 2023

Researcher Database Laboratory HP

Application of interactions of light and electrons to engineering

Photonics/Quantum-Electronics is a research field that deals with interactions of electromagnetic waves and materials. The aim of our research is to create new devices and systems by controlling the interactions of light and electrons. Our major research themes are nano-scale process technology, semiconductor lasers, imaging devices, and optical fiber communication systems.In the research of the nano-scale process technology, we have developed room-temperature imprint lithography that allows us to copy fine patterns, which were formed on a mold, to a surface of resin on a substrate, at room temperature. 
In the research of the semiconductor lasers, we have proposed and theoretically analyzed a new ridge structure, which can emit a laser beam with the fundamental transverse mode up to a high light-output. In the research of the imaging devices, we have discovered a structure, which can control the peak wavelength and spectral width independently. In the research of the optical fiber communication systems, we have proposed and analyzed several schemes to reduce four-wave-mixing noises, which are caused by the third-order optical nonlinear effect in the optical fibers.

  • Fabricated pattern by room-temperature imprint lithography