Researches on analysis of light scattering phenomena and their applications to optical measurement systems in biomedical, physicochemical, and environmental research fields
Research members： Dr. Toshiaki Iwai
Research fields： Electrical and electronic engineering, Applied physics, Biomedical engineering
Departments： Institute of Engineering
Keywords： light scattering, multiple scattering, Mie scattering generalized Lorentz-Mie theory, dynamic light scattering, optical coherence tomography, environmental particle, radiation pressure, optical tweezers, low-coherence dynamic light scattering
Web site：
Summary
Light scattering phenomena occur when objects to be measured are under illumination of light. Since the light propagating through a biological tissue or a dense suspension of particles is scattered many times, the multiple scattering becomes dominant. Based on analysis of such the multiple-scattering phenomena, the measurement systems have been studied in our laboratory to perform tomographic imaging of skin and biological tissues by optical coherence tomography; to manipulate and arrange nanoparticles or living cells by holographic optical tweezers; to characterize micro- and nano-particles in the dense media and Brownian dynamics in the area close to the interface between different phases by low-coherence dynamic light scattering; to image blood-vessel dynamics by diffusing light topography; and to develop optical counters for pollens and environmental particles.
Reference articles and patents
1) “Direct observation of submicron Brownian particles at a solid-liquid interface by extremely short coherence dynamic light scattering,” T. Watarai and T. Iwai, Appl. Phys. Express, 7 (2014) 10.7567/APEX.7.032502.
2) “Spectroscopic study on appearances of make-up skins using a visible RGB-LED OCT,” T. Tsugita, R. Kimura, and T. Iwai, Skin.Res. Technol. 20 (2014) 10.1111/srt.12130.
3)「光多重散乱現象解析」，岩井俊昭，光散乱の基礎と応用（講談社サイエンティフィック，東京，2014），第3章pp.109-134.
4) “Polarization analysis of light scattered by pollen grains of Cryptomeria japonica,” T. Iwai, Jpn. J. Appl. Phys. 52 (2013) 10.7567/JJAP.52.062404.
5) ”On-demand holographic optical tweezers,” J. Yamamoto and T. Iwai, Optical Nano and Micro Actuator Technology G. K. Knopf and Y. Otani (ed.) (CRC Press, Baca Raton, 2013) Chap.11, pp.333-345.
6) “Highly controllable optical tweezers using dynamic electronic holograms,” J. Yamamoto and T. Iwai, Curr. Pharm. Biotech., 13 (2012) 2655.
Contact
University Research Administration Center(URAC),
Tokyo University of Agriculture andTechnology
urac[at]ml.tuat.ac.jp
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