Nippon Telegraph and Telephone Corporation

Nippon Telegraph and Telephone Public Corporation

Akiyuki Tate

Tadayuki Imai

Masahiro Sasaura

Takashi Kurihara

Kazuo Fujiura

Seiji Toyoda

Koji Enbutsu

Makoto Shimokozono

Hiroshi Fushimi

Touru Matsuura

Kazuhito Higuchi

Shogo Yagi

Noboru Sonehara

Tsutomu Horikoshi

Osamu Niwa

Takeshi Okada

Takaaki Akimoto

Yuko Ueno

Haruhiko Kojima

Koichi Arishima

Hiroaki Hiratsuka

The present invention relates to a benzene detecting element capable of detecting benzene selectively and highly sensitively, and a preparation process thereof. The benzene detecting element of the present invention is a mesoporous silicate for detecting benzene selectively and highly sensitively in atmospheric air, and the detecting element has a nanosized fine pore having a highly ordered periodic fine pore structure, and the wall of the nanosized fine pore has a sub-nanosized fine pore. The nanosized fine pore has a pore size of from 0.15 nm to 50 nm in radius, the sub-nanosized fine pore has a pore size of from 0.05 to 0.5 nm in radius, and at least the sub-nanosized fine pore among the fine pores is modified with an organosilicon functional group having a phenyl group, or a silanol group. The present invention also relates to a preparation process of the detecting element.

Benzene detecting element and preparation process of same

The present invention provides an optical switch, an optical modulator, and a wavelength variable filter each of which has a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch according to the present invention includes a 3-dB coupler () placed on an input, a 3-dB coupler () placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section () that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaNbO(0&#x3c;x&#x3c;1) and KLiTaNbO(0&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;1), or KTaNbOor KLiTaNbO.

Optical switch, optical modulator and wavelength variable filter

An optical switch, an optical modulator, and a wavelength variable filter each have a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch includes a 3-dB coupler placed on an output, a 3-dB coupler placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaNbO(0&#x3c;x&#x3c;1) and KLiTaNbO(0&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;1), or KTaNbOor KLiTaNbO.

A method and an apparatus for three-dimensional holographic display suitable for moving object display are disclosed. At least one hologram of a display target object is displayed on a display device, and a non-scattered light is irradiated onto the display device to produce a scattered light. Then the scattered light from the display device as an object light of the display target object and the non-scattered light as a reference light are irradiated simultaneously at different incident angles onto a photorefractive medium having a photorefractive effect, and interference fringes generated by the object light and the reference light are recorded in the photorefractive medium. Then, the three-dimensional image is displayed by irradiating only the non-scattered light onto the photorefractive medium so as to reproduce a holographic image corresponding to the interference fringes recorded in the photorefractive medium.

Method and apparatus for three-dimensional holographic display suitable for video image display

An electrophotographic photoreceptor comprises an electrically conductive substrate, a layer of charge generating material which chloroaluminium phthalocyanine and chloroaluminium monochlorophthalocyanine are evaporated in a vacuum over the electrically conductive substrate and the evaporated film of chloroaluminium phthalocyanine and chloroaluminium monochlorophthalocyanine are treated by an organic solvent selected from the group consisting tetrohydrofurane, methanol, acetone, methyl ethyl ketone, .alpha.-chloronaphthalene, pyridine, a layer of charge transport material overcoated the layer of charge generating material. The electrophotographic photoreceptor and the preparation thereof is disclosed to apply for use in a laser printing machine in which a light of laser diode or light emission diode is used as a light source. The solvent treated layer of evaporated film of chloroaluminium phthalocyanine and chloroaluminium monochlorophthalocyanine are observed to have a high photosensitivity in near infrared region, especially over 750 nM of wavelength regions.

Electrophotographic photoreceptor and preparation thereof

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Mito, Japan

Akiyuki Tate