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Proceedings Paper

Bioimaging by molecular-vibration-sensitive quantitative phase microscopy based on wide-field mid-infrared photothermal excitation
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Paper Abstract

Label-free optical imaging is valuable for studying fragile biological phenomena where chemical and/or optical damages associated with exogenous labelling of biomolecules are not wanted. Molecular vibrational (MVI) and quantitative phase imaging (QPI) are the two most-established label-free imaging methods that provide biochemical and morphological information of the sample, respectively. While these methods have pioneered numerous important biological analyses along their intensive technological development over the past twenty years, their inherent limitations are still left unresolved. In this contribution, we present a unified imaging scheme that bridges the technological gap between MVI and QPI, achieving simultaneous and in-situ integration of the two complementary label-free contrasts using the midinfrared (MIR) photothermal effect. Our method is a super-resolution MIR imaging where vibrational resonances induced by wide-field MIR excitation and the resulting photothermal RI changes are detected and localized with the spatial resolution determined by a visible-light-based QPI system. We demonstrate applicability of this method, termed MV-sensitive QPI (MV-QPI), to live-cell imaging. Our MV-QPI method could allow for quantitative mapping of subcellular biomolecular distributions within the global cellular morphology in a label-free and damage-less manner, providing more comprehensive pictures of complex and fragile biological activities.

Paper Details

Date Published: 21 February 2020
PDF: 7 pages
Proc. SPIE 11252, Advanced Chemical Microscopy for Life Science and Translational Medicine, 112521N (21 February 2020); doi: 10.1117/12.2545728
Show Author Affiliations
Miu Tamamitsu, The Univ. of Tokyo (Japan)
Keiichiro Toda, The Univ. of Tokyo (Japan)
Yu Nagashima, The Univ. of Tokyo (Japan)
Ryoichi Horisaki, Osaka Univ. (Japan)
Japan Science and Technology Agency (Japan)
Takuro Ideguchi, The Univ. of Tokyo (Japan)
Japan Science and Technology Agency (Japan)

Published in SPIE Proceedings Vol. 11252:
Advanced Chemical Microscopy for Life Science and Translational Medicine
Ji-Xin Cheng; Wei Min; Garth J. Simpson, Editor(s)

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