Wataru Kashihara

Helical Nanocavity-Driven Upconversion Circularly Polarized Luminescence with Efficient Triplet Dynamics in Poly(methyl methacrylate) Stereocomplexes

Abstract Triplet–triplet annihilation photon upconversion circularly polarized luminescence (TTA-UC-CPL) in solid-state materials remains challenging because the molecular ordering required for chirality often compromises triplet energy transfer and oxygen tolerance. Herein, we r...

Preliminary Classification of Black Writing Pen Inks Using Optical-probing Photoacoustic Measurement by Pulsed Laser Excitation Combined with Machine Learning for Forensic Applications

Abstract We successfully measured the photoacoustic (PA) signals of black inks in solution from marking pens using a combination of optical-probing photoacoustic spectroscopy (OPPAS) with nanosecond pulsed laser excitation. OPPAS is a highly sensitive technique that detects heat...