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Article
Efficient phase matching algorithm for measurements of ultrathin indium tin oxide film thickness in white light interferometry
A novel method is proposed to measure the thickness of the indium tin oxide (ITO) film, which is less than 20 nm, using valid Fourier’s phase information of white light correlogram and curve matching algorithm...
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Article
Simple and accurate optical height sensor for wafer inspection systems
An accurate method for measuring the wafer surface height is required for wafer inspection systems to adjust the focus of inspection optics quickly and precisely. A method for projecting a laser spot onto the ...
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Article
A columnar model explaining long-term memory
A hologram provides a useful model for explaining the associative memory of the brain. Recent advances in neuroscience emphasize that single neurons can store complex information and that subtle changes in neu...
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Article
Widening the range of high-precision quantitative measurement in retardation-modulated differential interference microscope
To realize high-precision and wide-field measurements in retardation-modulated differential interference contrast (RM-DIC) microscope, we developed a new technique to stitch plural images taken by a high-magni...
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Article
In-focus Fourier-domain Optical Coherence Tomography by Complex Numerical Method
We introduce a numerical in-focus Fourier-domain optical coherence tomography(in-focus FD-OCT) which can measure cross-sectional images of samples with the high lateral resolution comparable with the resolutio...
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Article
Real Time and Full-range Complex Fourier Domain Optical Coherence Tomography
High speed complex full-range Fourier domain optical coherence tomography (FD-OCT) is demonstrated. This FD-OCT requires only a single A-scan for each single transversal position for full-range Fourier domain ...
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Article
Polarization Characteristics of Multiple Backscattering in Human Blood Cell Suspensions
The degree of polarization on normal and spiny red blood cell suspensions is analyzed by Mueller matrix measurement. Cells with spiny surface figures are prepared by adding salt to the suspension of diluted hu...
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Article
Direct Fabrication of Surface Relief Holographic Diffusers in Azobenzene Polymer Films
We propose a direct fabrication of light diffusers using azobenzene polymer films. Holographic recordings of surface relief diffusers are formed on the polymer film by exposure to an Nd:YAG laser (532 nm) thro...
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Article
Numerical Analysis of Photoinduced Surface Relief Grating Formation by Particle Method
The time evolution of photoinduced surface relief grating formation on azobenzene polymer films is analyzed by particle method for fluid mechanics. The surface relief grating is grown by using two beams interf...
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Article
Application of Surface Relief Hologram Using Azobenzene Containing Polymer Film
Surface relief holograms are fabricated by irradiation of laser interference patterns on an azobenzene polymer film. The hologram needs no post-treatment, and can be erased by heating the films to above its gl...
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Article
Jones Matrix Imaging of Biological Samples Using Parallel-Detecting Polarization-Sensitive Fourier Domain Optical Coherence Tomography
A polarization-sensitive Fourier domain optical coherence tomography (PS-FD-OCT) system has been developed. By using a two-dimensional CCD camera, this PS-FD-OCT simultaneously obtains two spectral interferogr...
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Article
Computer-Generated Holograms Based on the Three-Dimensional Fourier Spectrum
A method to synthesize a computer-generated hologram (CGH) of real-existing objects from projection images is proposed. Different from other similar methods, our method enables the synthesis of a CGH with only...
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Article
Polarization-Sensitive Spectral Interferometric Optical Coherence Tomography for Human Skin Imaging
Polarization-sensitive spectral interferometric optical coherence tomography (PS-SI-OCT) is designed for imaging of the inner structure of a biological tissue with polarization properties corresponding to Müll...
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Article
Polarization Sensitive Spectral Interferometric Optical Coherence Tomography for Biological Samples
A spectral interferometric optical coherence tomography (OCT) system which has polarization sensitivity is developed. This system reduces the mechanical scanning dimension by employing the principle of spectra...
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Article
Explanation of Human Skin Color by Multiple Linear Regression Analysis Based on the Modified Lambert-Beer Law
Quantitative analysis of human skin color is needed in the medical and cosmetic fields. Because of the strong light scattering by biological tissues, however, analysis of skin color has not yet been fully succ...
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Article
Direct Fabrication Methods of Surface Relief Electro-Optic Gratings in Azo-Polymer Films
Two fabrication methods of surface relief electro-optic (EO) gratings in azo-polymer films are described: surface deformation by a continuous wave laser and laser ablation by a pulse laser. In the fabrication ...
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Article
Fractional Fringe Order Method Using Fourier Analysis for Absolute Measurement of Block Gauge Thickness
A fringe analysis method, which combines the Fourier transform with the fractional fringe order method for measuring the absolute thickness of a block gauge, is presented. An approximate integer part of the fr...
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Article
Phase Retrieval of Phase-Shifting Interferometry with Iterative Least-Squares Fitting Algorithm: Experiments
We report our experimental results of phase-shifting interferometry with an iterative least-squares fitting technique to estimate both the wave front phases and the phase shifts. The method allows phase retrie...
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Article
Nonmechanical Optical Manipulation of Microparticle Using Spatial Light Modulator
A spatial light modulator (SLM) is introduced to an optical manipulation system. The real-time reconfigurable feature of the SLM makes it possible to perform an optical manipulation of microparticles without m...
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Article
Optical Implementation of Entropy Network Mapped from Binary Feature Tree
An entropy network mapped from a binary feature tree is described and compared with the Hamming net. Implementation of the entropy network includes extracting features from an input and making the decision acc...
