Abstract: An optical semiconductor device in which a first optical waveguide 407 comprising a silicon-containing amorphous semiconductor layer and a second optical waveguide 409 containing a silicon-containing i-type semiconductor layer as a constituent element are disposed in different layers in a range in which optical interaction can occur. An electro-optical modulator 409 having a pin junction structure comprising a p-type semiconductor layer 403, an i-type semiconductor layer 404, and an n-type semiconductor layer 405 is provided to at least a portion of the second optical waveguide 409, and the index of refraction of the second optical waveguide is varied by the electro-optical modulator, whereby light waves propagated through the first optical waveguide are modulated.

Abstract: An optical semiconductor device in which a first optical waveguide 407 comprising a silicon-containing amorphous semiconductor layer and a second optical waveguide 409 containing a silicon-containing i-type semiconductor layer as a constituent element are disposed in different layers in a range in which optical interaction can occur. An electro-optical modulator 409 having a pin junction structure comprising a p-type semiconductor layer 403, an i-type semiconductor layer 404, and an n-type semiconductor layer 405 is provided to at least a portion of the second optical waveguide 409, and the index of refraction of the second optical waveguide is varied by the electro-optical modulator, whereby light waves propagated through the first optical waveguide are modulated.

Abstract: A light source circuit transmits light incident from a semiconductor laser source to a plurality of optical devices. At least one optical branch section is formed to branch one input-side optical waveguide at least into a first output-side optical waveguide terminal and a second output-side optical waveguide terminal. A light path length (L1) between the optical branch section and a next-stage optical branch section or the optical device is connected to the first output-side optical waveguide extending from the optical branch section and a light path length (L2) between the optical branch section and the next-stage optical branch section selected such that the absolute value of a difference between (L1) and (L2) is (¼+i/2) times (i is zero or a positive integer) the wavelength of the light transmitted through the light source circuit.

Abstract: A light source circuit transmits light incident from a semiconductor laser source to a plurality of optical devices. At least one optical branch section is formed to branch one input-side optical waveguide at least into a first output-side optical waveguide terminal and a second output-side optical waveguide terminal. A light path length (L1) between the optical branch section and a next-stage optical branch section or the optical device is connected to the first output-side optical waveguide extending from the optical branch section and a light path length (L2) between the optical branch section and the next-stage optical branch section selected such that the absolute value of a difference between (L1) and (L2) is (¼+i/2) times (i is zero or a positive integer) the wavelength of the light transmitted through the light source circuit.

Abstract: An object of the present invention is to provide a three-dimensional photonic crystal which allows an internal formation of a defect structure with an arbitrary shape and size. Multiple holes extending to two different directions are formed obliquely to a base body surface in order to form a first crystal and a second crystal. Base body left between the holes are made to be rods. Moreover, a connection crystal layer is formed by a part of rods having a size different from that of the rods in the first crystal and the second crystal. The connection crystal layer is held between the first crystal and the second crystal and they are fused. In a three-dimensional photonic crystal thus obtained, the rod becomes a point defect. The shape and size of the point defect can be arbitrarily set in any directions within the connection crystal layer. The shape and size of the point defect can also be controlled by adjusting the thickness of the connection crystal layer.

Abstract: By making a cathode substrate function as a cathode and applying a voltage to the cathode and an anode, an electron emission element emits an electron from an electron source provided on the cathode substrate, and irradiates the electron onto an electron irradiation surface formed on the anode surface. The electron source is thread-type and provided on the cathode substrate. A deflecting voltage generates the electric field around the electron source. The electron source including a charge receives a power from the generated electric field to curve. Therefore, an irradiation position of the electron moves on the electron irradiation surface. Since it becomes unnecessary to move the electron irradiation surface and the electron source, a configuration of the electron emission element or an apparatus including the electron emission element is not complicated, and can be miniaturized and simple.

Abstract: An object of the present invention is to provide a three-dimensional photonic crystal which allows an internal formation of a defect structure with an arbitrary shape and size. Multiple holes extending to two different directions are formed obliquely to a base body surface in order to form a first crystal and a second crystal. Base body left between the holes are made to be rods. Moreover, a connection crystal layers is formed by a part of rods having a size different from that of the rods in the first crystal and the second crystal. The connection crystal layer is held between the first crystal and the second crystal and they are fused. In a three-dimensional photonic crystal thus obtained, the rod becomes a point defect. The shape and size of the point defect can be arbitrarily set in any directions within the connection crystal layer. The shape and size of the point defect can also be controlled by adjusting the thickness of the connection crystal layer.

Abstract: A method for applying a carbon nanotube growth catalyst to at least one specified location on a substrate surface of a substrate formed of conductive material, and the method includes a preparation step for preparing on the substrate a coating layer having a hole contacting the substrate surface at a location corresponding to the specified location. The method also includes a deposition step for forming by deposition a conical deposited material on a substrate surface portion contacting the hole by irradiating the substrate with electrically conductive material particles in a oblique direction from above the coating layer while rotating the substrate about a shaft perpendicular to the substrate surface, and for forming by deposition an eaves-like deposited layer which extends to close an opening of the hole.

Abstract: By making a cathode substrate function as a cathode and applying a voltage to the cathode and an anode, an electron emission element emits an electron from an electron source provided on the cathode substrate, and irradiates the electron onto an electron irradiation surface formed on the anode surface. The electron source is thread-type and provided on the cathode substrate. A deflecting voltage generates the electric field around the electron source. The electron source including a charge receives a power from the generated electric field to curve. Therefore, an irradiation position of the electron moves on the electron irradiation surface. Since it becomes unnecessary to move the electron irradiation surface and the electron source, a configuration of the electron emission element or an apparatus including the electron emission element is not complicated, and can be miniaturized and simple.

Abstract: A transportation system with high-efficiency and large-capacity utilizing potential energy. A transportation vehicle travels at a high speed by potential energy by a level difference on a magnetic levitation guide disposed in a vacuum transportation passage to transport transportation cargoes to a destination location. The transportation vehicle is levitated on the magnetic levitation guide non-contactingly and with a low frictional resistance utilizing a superconduction. Superconductive magnetic levitation holds the transportation vehicle at a stable floated position mainly utilizing a binding force by the pinning effect of a superconductor.

Abstract: The film forming apparatus comprises: a turntable 1 which rotates an optical disc substrate 3; and a film forming liquid supplying device 2 which supplies an ultraviolet curing resin 4 onto the optical disc substrate 3. While the optical disc substrate 3 is rotated by the turntable 1, the ultraviolet curing resin 4 is supplied onto the optical disc substrate 3 by the film forming liquid supplying device 2.

Abstract: A method of decomposing a polychlorobiphenyl compound-containing material into an unharmful state, wherein the material is treated with a supercritical water containing an alkaline substance at a temperature higher than the critical temperature of water and a pressure higher than the critical pressure of water.

Abstract: An optical recording medium has a substrate and a recording film of phthalocyanine coloring matter provided on the substrate. A recording power is determined in such a manner that a .beta. value represented by the following equation becomes a value between -0.3 and 0.beta.=(A1+A2)/(A1-A2)where A1 represents a peak level in a plus range and A2 represents a peak level in a minus range of a reproduced signal coupled with alternating current.

Abstract: An optical recording medium has a substrate, a recording film of phthalocyanine coloring matter and provided on the substrate, a light reflection film on the recording film, and a protection film on the light reflection film. The light reflection film is made of Au and has a thickness less than 1500 .ANG..

Abstract: A writable recording medium having reduced jitter, improved performance on repeated reproduction, improved light resistance, and sensitivity controllability is disclosed, in which a light-absorbing layer thereof contains (D-1) a cyanine dye having an absorption band in the wavelength region of light for recording or reproduction, (D-2) a cyanine dye having an absorption band in a shorter wavelength region than that of cyanine dye (D-1) and having a smaller absorption than that of cyanine dye (D-1) in the wavelength region of light for recording or reproduction, (Q-1) a quencher for preventing photo-deterioration of cyanine dyes, and (Q-2) a quencher selected from an azo compound and a diphenylamine compound, the weight ratio of cyanine dye (D-2) to cyanine dye (D-1), taken as .alpha., being from 1 to 3, the weight ratio of quencher (Q-1) to quencher (Q-2), taken as .beta., being from 0.

Abstract: An optical recording medium having at least a pair of recording films which have a predetermined light absorption distribution and have steep absorption end slopes which are closer to each other. The difference between the wavelengths of recording or reproduction lights for these two recording films may be close to about 50 nm. A common optical system may be used for recording or reproduction operation for the two recording films, whereby the optical system may be simplified.

Abstract: An information recording apparatus for receiving recording information and index information with respect to the recording information, and recording the recording information on a recordable disc medium, including memory device for storing the index information as first index information, first recording device for recording the recording information on the disc recording medium in accordance with the first index information, control device for producing second index information on the basis of the first information, and second recording device for recording the second index information on the disc recording medium in parallel with the recording by the first recording device.

Abstract: A write once read many type optical disc comprises a light transmissive substrate having a tracking groove formed therein, a light absorbing layer disposed on a surface of the substrate on which the tracking groove is formed, and a light reflection layer disposed on the light absorbing layer, wherein an RMI value defined by the following formula is not lower than 0.22: RMI value=(I.sub.l -I.sub.g)I.sub.o, wherein I.sub.l denotes an electric potential at a land portion, I.sub.g denotes an electric potential at a groove portion, and I.sub.o denotes an electric potential at a mirror surface portion.When the write once read many type optical disc is caused to have a structure as described above, there may be provided the write once read many type optical disc having a good playability, i.e., the optical disc wherein the TE level may be provided assuredly on the basis of a value obtained from one beam.

Abstract: A Langmuir-Blodgett (LB) film forming apparatus has a packing unit for orientating and packing a sample which is a composition for forming a monomolecular film developed on a subphase stored in a first tank, a sampling unit for sampling the orientated and packed monomolecular film on a substrate, and an outer casing enclosing the packing unit and sampling unit. The packing unit has a second tank in which a circulating solution is stored and the first tank is disposed in the solution. A temperature of the circulating solution in the second tank is controlled by a first controller and a temperature of atmosphere enclosed by the casing is controlled by a second controller. The first and second controllers are synchronously operated. The substrate is disposed above the subphase in a vertical attitude.

Abstract: An LB film forming device according to the present invention having a packing control device by which a barrier is moved under the control of the packing control device to compress a sample until the sample spreading over the surface of a subphase liquid provides a predetermined set surface pressure, the absorbance of the thus compressed sample is measured, and thereafter the barrier is moved under the control of the absorbance as desired so as to provide a predetermined set value of the absorbance. Such an LB film forming device may stably provide a film having predetermined film characteristics.