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Using visible light for nonlinear optical imaging and fabrication

Time：10:00, March 16, 2024

MeetingRoom：401@9003

Abstract：

In the deep ultraviolet (UV) spectral region, the interaction of photons and materials induces different types of optical responses in various materials, such as luminescence, photoisomerization, and polymerization. However, due to the lack of optical components and devices available in this deep UV region, its applications have been limited compared to visible light. In this study, we introduce a methodology that aims to emulate the optical excitation properties of deep-ultraviolet light, focusing on two-photon excitation using visible laser pulses. By utilizing this methodology, it is possible to induce high energy excited states in materials using existing optics and visible pulse radiation. Experimental results show that this technique can be applied to two-photon excitation fluorescence microscopy, facilitating simultaneous high-resolution multicolor imaging of biological specimens. Furthermore, it has been shown that this two-photon excitation can activate the photopolymerization process of various materials without the need for conventional polymerization initiators.

Biography:

Katsumasa Fujita, professor of Department of Applied Physics, executive director of Photonics Advanced Research Center at Osaka University. He has been promoted as professor in Department of Applied Physics, Osaka University in 2018. He is Visiting Scientist in RIKEN since 2009, Visiting Professor in Kyoto Prefectural University of Medicine and Joint Appointed Fellow in PhotoBIO-OIL, AIST, Japan since 2019, Executive Director of Photonics Center in Osaka University since 2020. His research and teaching interests is nonlinear optics, biophotonics, super-resolution microscopy, and Raman spectroscopy/microscopy. He has many publications in J. Am. Chem. Soc., ACS NANO, Nat. Commun., Proc. Natl. Acad. Sci. USA and so on. He has achieved awards and honors, such as RIKEN Significant Achievement Award, RIKEN in 2023, Presidential Awards for Encouragement, Osaka University in 2015, Presidential Awards for Encouragement, Osaka University in 2014, Encouraging Prizes, FY2013 Nakatani Award, Nakatani Foundation in 2014, Presidential Awards for Achievement, Osaka University in 2013, The Spectroscopical Society of Japan Award for Young Scientists in 2011, Best Optics Paper Awards, Japan Society of Applied Physics in 2010 and so on.