Prof. Toshiaki Iwai Profile

Prof. Toshiaki Iwai

Professor at Tokyo Univ of Agriculture and Technology

SPIE Involvement:

Author

Publications (37)

Proceedings Article | 15 June 2020 Paper

RGB-spectroscopic OCT imaging using single-panel CMOS color camera

Yoshiaki Tanuma, Toshiaki Iwai

Proceedings Volume 11521, 115210S (2020) https://doi.org/10.1117/12.2573238

KEYWORDS: Optical coherence tomography, RGB color model, CMOS cameras, Cameras, Light sources, Tomography, Light emitting diodes, Image resolution, Skin, Optical filters

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Proceedings Article | 24 April 2018 Paper

Optical control of orientation of nanosheet in colloidal state

Yasutaka Suzuki, Makoto Tominaga, Takashi Nagashita, Toshiaki Iwai, Teruyuki Nakato, Jun Kawamata

Proceedings Volume 10712, 1071222 (2018) https://doi.org/10.1117/12.2323309

KEYWORDS: Liquid crystals, Particles, Polarization, Liquids, Crystals, Optical manipulation, Laser irradiation, Laser beam propagation, Laser crystals, Liquid crystal lasers

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Proceedings Article | 24 April 2018 Paper

Diffuse light reflectometry for measuring scattering and absorption coefficients of a biological tissue

Daiki Maeda, Toshiaki Iwai, Mitaro Namiki

Proceedings Volume 10711, 107111L (2018) https://doi.org/10.1117/12.2319355

KEYWORDS: Light scattering, Scattering, Particles, Reflectometry, Absorption, Mie scattering, Silica, Tissue optics, Optical properties, Tissues

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Proceedings Article | 18 April 2017 Paper

Microscopic video observation of capillary vessel systems using diffuse back lighting

Minako Sakai, Hiroki Arai, Toshiaki Iwai

Proceedings Volume 10251, 102510E (2017) https://doi.org/10.1117/12.2274907

KEYWORDS: Skin, Tissues, Fiber optic illuminators, Light emitting diodes, Natural surfaces, Imaging systems

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Proceedings Article | 18 April 2017 Paper

Comparative study on visible-OCT imagings using a LED and a super-continuum laser with a wavelength-tunable filter

Etsuko Tokunaga, Toshiaki Iwai

Proceedings Volume 10251, 102511I (2017) https://doi.org/10.1117/12.2272372

KEYWORDS: Skin, Tomography, Imaging systems, LED lighting

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Proceedings Article | 31 October 2016 Paper

Extinction measurement of dense media by an optical coherence tomography technique

Tomoki Ago, Toshiaki Iwai, Ryoko Yokota

Proceedings Volume 10024, 100240I (2016) https://doi.org/10.1117/12.2246364

KEYWORDS: Optical coherence tomography, Light scattering, Absorption, Scattering, Particles, Signal attenuation, Spectroscopy, Silica, Mie scattering, Water

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SPIE Journal Paper | 15 August 2014 Open Access

Real-time photoacoustic imaging system for burn diagnosis

Taiichiro Ida, Yasushi Kawaguchi, Satoko Kawauchi, Keiichi Iwaya, Hitoshi Tsuda, Daizoh Saitoh, Shunichi Sato, Toshiaki Iwai

JBO, Vol. 19, Issue 08, 086013, (August 2014) https://doi.org/10.1117/12.10.1117/1.JBO.19.8.086013

KEYWORDS: Imaging systems, Tissues, Skin, Blood vessels, Photoacoustic imaging, Sensors, Absorption, Injuries, Signal detection, Fiber lasers

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Proceedings Article | 6 August 2014 Paper

Optical characterization of facial foundation applied to skin replicas by using visible FF-OCT

Ryota Kimura, Toshiaki Iwai, Tetsuya Tsugita

Proceedings Volume 9232, 92320X (2014) https://doi.org/10.1117/12.2063854

KEYWORDS: Skin, Optical coherence tomography, Geometrical optics, Light emitting diodes, Tissue optics, Light sources, Neodymium, Tomography, Light, 3D image processing

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Proceedings Article | 6 August 2014 Paper

Hybrid Mie-MCML Monte Carlo simulation of light propagation in skin layers

Yu Kawai, Toshiaki Iwai

Proceedings Volume 9232, 923206 (2014) https://doi.org/10.1117/12.2063715

KEYWORDS: Skin, Tissue optics, Monte Carlo methods, Mie scattering, Natural surfaces, Tissues, Absorption, Scattering, Light scattering, Ray tracing

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Proceedings Article | 6 August 2014 Paper

Topological imaging of blood vessels by using diffusing light

Shotaro Kohama, Toshiaki Iwai

Proceedings Volume 9232, 92320Y (2014) https://doi.org/10.1117/12.2063714

KEYWORDS: Blood vessels, Skin, Light scattering, Tissues, Scattering, Blood circulation, Diffuse reflectance spectroscopy, Imaging systems, Laser scattering, Tissue optics

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Proceedings Article | 19 September 2013 Paper

One-shot measurement of the air-liquid interface effect by a spectral-domain low-coherence dynamic light scattering technique

T. Watarai, T. Iwai

Proceedings Volume 8839, 88390H (2013) https://doi.org/10.1117/12.2023004

KEYWORDS: Interfaces, Particles, Diffusion, Dynamic light scattering, Light scattering, Scattering, Liquids, Optical coherence tomography, CCD cameras, Cameras

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Proceedings Article | 14 June 2013 Paper

Voxel-based Monte Carlo simulation for light propagation in inhomogeneous turbid media

Katsuhiro Ishii, Tatsuhiro Okada, Izumi Nishidate, Toshiaki Iwai

Proceedings Volume 8799, 87990S (2013) https://doi.org/10.1117/12.2032484

KEYWORDS: Scattering, Light scattering, Monte Carlo methods, Computer simulations, 3D image reconstruction, 3D image processing, Multiple scattering, Photons, Mass attenuation coefficient, Biological research

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Proceedings Article | 4 March 2013 Paper

Real-time photoacoustic imaging system for clinical burn diagnosis

Taiichiro Ida, Yasushi Kawaguchi, Satoko Kawauchi, Keiichi Iwaya, Daizoh Saitoh, Shunichi Sato, Toshiaki Iwai

Proceedings Volume 8581, 858109 (2013) https://doi.org/10.1117/12.2002223

KEYWORDS: Skin, Tissues, Imaging systems, Blood, Photoacoustic imaging, Transducers, Injuries, Defense and security, Photoacoustic spectroscopy, Tissue optics

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Proceedings Article | 28 August 2010 Paper

Spatial stability of particles trapped by time-modulated optical potentials

Johtaro Yamamoto, Toshiaki Iwai

Proceedings Volume 7762, 77622F (2010) https://doi.org/10.1117/12.863550

KEYWORDS: Particles, Switching, Time division multiplexing, Optical tweezers, Spatial light modulators, Holograms, Optical simulations, Holography, Gaussian beams, Numerical analysis

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Proceedings Article | 28 August 2010 Paper

Amplitude-phase modulation for reducing the 0th order beam spot in holographic optical tweezers

Toshiaki Iwai, Johtaro Yamamoto, Yuki Doi

Proceedings Volume 7762, 77622G (2010) https://doi.org/10.1117/12.863551

KEYWORDS: Spatial light modulators, Polarizers, Phase shift keying, Birefringence, Numerical simulations, Modulation, Particles, Polarization, Holograms, Amplitude modulation

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Proceedings Article | 10 July 2009 Paper

Numerical analysis on propagation of light in turbid media using path-length assigned Monte Carlo simulation

Katsuhiro Ishii, Izumi Nishidate, Toshiaki Iwai

Proceedings Volume 7369, 73691A (2009) https://doi.org/10.1117/12.831657

KEYWORDS: Light scattering, Scattering, Monte Carlo methods, Computer simulations, Particles, Multiple scattering, Scattering media, Numerical analysis, Optical coherence tomography, Tissues

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Proceedings Article | 11 September 2006 Paper

Real-time dynamic optical tragging of particles using a phase shift method

Toshiaki Iwai, Johtaro Yamamoto

Proceedings Volume 6326, 63262T (2006) https://doi.org/10.1117/12.684395

KEYWORDS: Particles, Spatial light modulators, Phase shifts, Holograms, Optical tweezers, Fourier transforms, Objectives, Holography, Beam splitters, Time division multiplexing

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Proceedings Article | 23 September 2005 Paper

Diffusing light topography (DLT) for mapping blood vessels

T. Iwai, N. Mikami

Proceedings Volume 5959, 59590E (2005) https://doi.org/10.1117/12.623576

KEYWORDS: Blood vessels, Photons, Scattering, Diffuse reflectance spectroscopy, Light scattering, Mirrors, Laser scattering, Skin, Tissue optics, Diffusion

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Proceedings Article | 19 August 2005 Paper

Laser beam manipulation of particles using dynamic holograms

T. Iwai, M. Shirai

Proceedings Volume 5930, 593020 (2005) https://doi.org/10.1117/12.618084

KEYWORDS: Particles, Holograms, Spatial light modulators, Optical tweezers, Objectives, Modulation, Beam splitters, Glasses, Polarization, Microscopes

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Proceedings Article | 19 November 2003 Paper

Spectrum analysis of dynamic scattering light measured via a low-coherence interferometer

Katsuhiro Ishii, Toshiaki Iwai

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.530035

KEYWORDS: Light scattering, Dynamic light scattering, Light, Interferometers, Scattering, Light sources, Optical testing, Scatter measurement, Spectrum analysis, Laser scattering

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Proceedings Article | 30 October 2001 Paper

Optical fabrications of ordered polystyrene particles using radiation pressure and self-organization

Toshiaki Iwai, Katsuhiro Ishii, Kuon Inoue

Proceedings Volume 4598, (2001) https://doi.org/10.1117/12.447096

KEYWORDS: Particles, Crystals, Photonic crystals, Glasses, Capillaries, Objectives, Spatial frequencies, Optical fabrication, Metals, Crystallography

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Proceedings Article | 30 October 2001 Paper

Numerical simulation of ordered polystyrene particles using radiation pressure and self-organization

Katsuhiro Ishii, Toshiaki Iwai, Kuon Inoue

Proceedings Volume 4598, (2001) https://doi.org/10.1117/12.447094

KEYWORDS: Particles, Monte Carlo methods, Photonic crystals, Crystals, Latex, Dielectrics, Optical simulations, Numerical simulations, Photonic crystal devices, Manufacturing

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Proceedings Article | 13 June 2001 Paper

Simultaneous viscometry and particle sizing on the basis of dynamic light scattering

Katsuhiro Ishii, Toshiaki Iwai, Shigeo Wada, Masaoki Miyakoshi

Proceedings Volume 4263, (2001) https://doi.org/10.1117/12.429329

KEYWORDS: Particles, Light scattering, Blood, Dynamic light scattering, Particle sizing, Speckle, Fluid dynamics, Diffusion, Erbium, Solids

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Proceedings Article | 8 May 2001 Paper

Spatial anisotropy and polarization in enhanced backscattering of light using double-scattering approximation

Katsuhiro Ishii, Toshiaki Iwai

Proceedings Volume 4416, (2001) https://doi.org/10.1117/12.427009

KEYWORDS: Polarization, Backscatter, Particles, Light scattering, Anisotropy, Fractal analysis, Scattering, Rayleigh scattering, Jones vectors, Analytical research

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Proceedings Article | 19 July 1999 Paper

Surface profiling of an absorber embedded in a dense medium by spatial integration of the backscattered light

Toshiaki Iwai, Gaku Kimura

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.354978

KEYWORDS: Scattering, Monte Carlo methods, Light scattering, Integrated optics, Profiling, Backscatter, Laser scattering, Tissues, Tissue optics, Helium neon lasers

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Proceedings Article | 17 May 1999 Paper

Monitoring of the cluster growth in the colloidal suspension using a diffusive-wave spectroscopic technique

Katsuhiro Ishii, Toshiaki Iwai

Proceedings Volume 3599, (1999) https://doi.org/10.1117/12.348365

KEYWORDS: Particles, Light scattering, Scattering, Multiple scattering, Spectroscopy, Dynamic light scattering, Diffusion, Fractal analysis, Latex, Blood

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Proceedings Article | 7 May 1999 Paper

Optical sensing of fractal aggregates of particles using backscattering enhancement

Katsuhiro Ishii, Toshiaki Iwai

Proceedings Volume 3740, (1999) https://doi.org/10.1117/12.347741

KEYWORDS: Particles, Fractal analysis, Backscatter, Absorption, Optical sensing, Latex, Glasses, Light scattering, CCD cameras, Scattering

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Proceedings Article | 7 May 1999 Paper

Optical monitoring of the concentration profile of submicron latex particles in flow through a translucent water-permeable tube: demonstration of flow-dependent concentration polarization of plasma

Shigeo Wada, Toshiaki Iwai, Takeshi Karino

Proceedings Volume 3740, (1999) https://doi.org/10.1117/12.347796

KEYWORDS: Polarization, Mass attenuation coefficient, Blood, Latex, Particles, Translucency, Arteries, Plasma, Hemodynamics, Optical testing

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Proceedings Article | 29 April 1999 Paper

Particle sizing based on enhanced backscatterings of light from dense disordered media

Toshiaki Iwai, Katsuhiro Ishii, Toshimitsu Asakura

Proceedings Volume 3729, (1999) https://doi.org/10.1117/12.346798

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SPIE Journal Paper | 1 April 1999 Open Access

Correlation properties of light backscattered multiply from fractal aggregates of particles under Brownian motion

Katsuhiro Ishii, Toshiaki Iwai, Toshimitsu Asakura

JBO, Vol. 4, Issue 02, (April 1999) https://doi.org/10.1117/12.10.1117/1.429913

KEYWORDS: Light scattering, Fractal analysis, Absorption, Particles, Scattering, Backscatter, Monte Carlo methods, Retroreflectors, Diffusion, Spectroscopy

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Proceedings Article | 19 June 1998 Paper

Coherent backscattering of light from a polydisperse random medium as a model of fractal aggregations of particles

Toshiaki Iwai, Katsuhiro Ishii, Toshimitsu Asakura

Proceedings Volume 3252, (1998) https://doi.org/10.1117/12.311880

KEYWORDS: Particles, Scattering, Light scattering, Backscatter, Monte Carlo methods, Fractal analysis, Polarization, Diffusion, Rayleigh scattering, Chemical analysis

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Proceedings Article | 18 August 1997 Paper

Monte Carlo simulations of the polarization anisotropy in light backscattered from a fractal aggregation

Katsuhiro Ishii, Toshiaki Iwai, Toshimitsu Asakura

Proceedings Volume 2979, (1997) https://doi.org/10.1117/12.280292

KEYWORDS: Scattering, Light scattering, Fractal analysis, Polarization, Particles, Monte Carlo methods, Absorption, Anisotropy, Rayleigh scattering, Electromagnetic scattering theory

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Proceedings Article | 2 May 1997 Paper

Space-time statistics of coherently backscattered light from fractal and nonfractal random media with absorption

Toshiaki Iwai, Katsuhiro Ishii, Toshimitsu Asakura

Proceedings Volume 2982, (1997) https://doi.org/10.1117/12.273604

KEYWORDS: Light scattering, Fractal analysis, Absorption, Scattering, Particles, Backscatter, Monte Carlo methods, Polarization, Diffusion, Rayleigh scattering

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SPIE Journal Paper | 1 December 1996

Testing parameters in a common test method for phi90 mm/600 Mbyte phase-change optical disks

Seiya Yamada, Takahiro Kubo, Kohei Yamauchi, Junji Ohtsubo, Masahisa Shinoda, T. Utakouji, Toshiaki Iwai

OE, Vol. 35, Issue 12, (December 1996) https://doi.org/10.1117/12.10.1117/1.601115

KEYWORDS: Optical discs, Distortion, Phase measurement, Computer simulations, Optical testing, Standards development, Optics manufacturing, Testing and analysis, Manufacturing, Modulation