Yoshio Hayasaki

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We envision a laser-induced plasma technology in general applications for public use. If laser-induced plasma aerial images were made available, many useful applications such as spatial aerial AR, aerial user interfaces, volumetric images could be produced. This would be a highly effective display for the expression of three-dimensional information.(More)
We present a new method of rendering aerial haptic images that uses femtosecond-laser light fields and ultrasonic acoustic fields. In conventional research, a single physical quantity has been used to render aerial haptic images. In contrast, our method combines multiple fields (light and acoustic fields) at the same time. While these fields have no direct(More)
The proposed technique for optical neural networks can perform all the neural operations in a positive range. Bipolar weights of the neurons are represented by unipolar weights with a positive constant. By superposing the reversal inputs to the weighted sums, we can perform subtraction in a neuron by the nonlinear output function with a negative offset(More)
We propose a holographic-laser-drawing volumetric display using a computer-generated hologram displayed on a liquid crystal spatial light modulator and multilayer fluorescent screen. The holographic-laser-drawing technique has enabled three things; (i) increasing the number of voxels of the volumetric graphics per unit time; (ii) increasing the total input(More)
Digital super-resolution interference microscopy (DiSRIM) based on an optical interference measurement and a complex-amplitude pattern matching method is a method for observing nanostructures beyond the diffraction limit of light. The fundamental property of this method is investigated form a size measurement of a single rectangular convex element with a(More)
We demonstrate an optical profilometer composed of an optical frequency comb source, a single pixel camera, and an optoelectronic interferometer in radio frequecny range. The system enables us to measure an object with a large depth much more than a light wavelength. The wide dynamic range is achieved by the high stability of the RF signal. The single pixel(More)
We demonstrate the three-dimensional position measurement of a 100nm-gold nanoparticle held in optical tweezers in solution using an in-line low-coherence digital holographic microscope. The trapped gold nanoparticle had the axial movement of 4.5nm in the standard deviation when a 300mW laser beam was focused with an 1.25NA objective lens.
We use an interferometric time-resolved observation of a femtosecond-laser pulse interaction with glass from 100 fs to 10 ns at submicrometer spatial lateral resolution. The phase and amplitude images reveal sequence of events after the irradiation of a single ultra-short laser pulse at close-to-threshold intensity when permanent refractive index changes(More)