Plenary Sessions

Plenary Sessions Tue. 20 April 2021, 13:00-15:00

Photonic Innovations for Pandemic Management and a Brighter World

Plenary Speakers

Keisuke Goda Shin-ichi Nagahama

Keisuke Goda

Department of Chemistry, University of Tokyo, Japan / Department of Bioengineering, University of California, Los Angeles, USA / Institute of Technological Sciences, Wuhan University, China

Theme:"COVID-19 & Photonics"



COVID-19 & Photonics

The COVID-19 pandemic has dramatically changed our life. According to WHO, as of October 2020, 10% of the world population may have been infected with the coronavirus, leading to more than one million confirmed deaths. While scientists are making efforts in various sectors to beat the pandemic, photonics plays an important role in coronavirus detection as well as clinical diagnosis and therapy of COVID-19 and its complications via optical sensing, spectroscopy, and imaging. For example, infrared thermography performs real-time thermal mapping of pedestrians on the street, whereas SERS sensitively identifies viruses in airborne aerosols and wastewaters. Moreover, photonics is an essential part of PCR testing (for detecting infections) and flow cytometry (for evaluating treatment effectiveness) via fluorescence detection. In my talk, I will discuss recent related findings and technology about COVID-19 including my group’s work on optical imaging and spectroscopy of COVID-19.


Keisuke Goda is a professor in the Department of Chemistry at the University of Tokyo in Japan, an adjunct professor in the Institute of Technological Sciences at Wuhan University in China, and an adjunct professor in the Department of Bioengineering at UCLA in USA.
He obtained a BA degree from UC Berkeley summa cum laude in 2001 and a PhD from MIT in 2007, both in physics. At MIT, he worked on the development of gravitational-wave detectors in the LIGO group which led to the 2017 Nobel Prize in Physics. After several years of work on high-speed imaging and microfluidics at Caltech and UCLA, he joined the University of Tokyo as a professor in 2012. His research group focuses on the development of serendipity-enabling technologies based on laser-based molecular imaging and spectroscopy together with microfluidics and computational analytics to push the frontier of science. He has published >300 papers including many in top journals, filed >30 patents, and received numerous awards such as JSPS Prize, Japan Academy Medal, Yomiuri Gold Medal, and MEXT Prize. He is a fellow of SPIE and RSC.

Shin-ichi Nagahama

Principal Researcher, General manager LD Development Dept. NICHA Corporation, Japan

Theme:"GaN-based laser diodes and their new applications"



GaN-based laser diodes and their new applications

Visible light Laser Diodes (LDs) have many features that other light sources do not have, such as wide color reproduction range, small size, robustness, long lifetime, low power consumption, and small etendue. Recently, in GaN-based LDs, Green LDs have been mass-produced in addition to Blue LDs. By adding existing AlGaInP-based red LDs to these, RBG LDs are now available. As a result, laser displays that use LDs as the light source for laser TVs and laser projectors have been commercialized more and more.
Currently, laser displays using visible light LDs are growing in the market. In addition to consumer applications, visible light LDs are also being used in new applications such as vehicles, lighting, and industrial applications such as laser processing. In this presentation, we will report on our history and current status of the development of GaN-based LDs and outline their new applications.


Shin-ichi Nagahama is Principal Researcher and General Manager of LD business unit at NICHIA corporation. He joined Nichia in 1991 and participated in the development of GaNbased blue LEDs. And in 1993, Nichia announced the world’s first high-brightness blue LED.
The following year, in 1994, he started developing GaN-based violet LDs, and succeeded in the world’s first GaN-based LD emission by current injection in 1995. After that, he pushed forward with the development to cover a wider range of emission wavelengths, and as a result, UV (375 nm) to blue (460 nm) and green (532 nm) LDs have been commercialized. In 2002, he received his Ph.D. from Tokushima University, Japan. He has written more than 100 patents on GaN-based light emitting devices in Japan and more than 200 in foreign countries.