Abstract: In an infrared detection element 15, a first substrate 36 is bonded to a front side of a pyroelectric substrate 20. Since the thermal expansion coefficient of the first substrate 36 is lower than that of the pyroelectric substrate 20, deformation of the pyroelectric substrate 20 due to thermal expansion can be suppressed by the first substrate 36. Further, since a thermal expansion coefficient difference D is 8.9 ppm/K or less, the thermal expansion coefficient between the first substrate 36 and the pyroelectric substrate 20 is not excessively large, and this can suppress deformation of the infrared detection element 15 due to the thermal expansion coefficient difference between the first substrate 36 and the pyroelectric substrate 20.

Abstract: A connecting structure includes an optical waveguide part, a holding part of holding an optical input member, and an adhering part adhering the optical waveguide part and holding part. The optical waveguide part includes an optical waveguide substrate including an optical waveguide. At least one of the holding part and optical waveguide part includes a recess and an adhesive face adjacent to the recess. The adhering part is provided on the adhesive face and in a single region distant from the optical waveguide substrate in a direction of thickness of the optical waveguide substrate. The recess is provided between the adhering part and optical waveguide substrate. A space is provided between an end face of the optical input member and an end face of the optical waveguide.

Abstract: It is provided a thermoelectric conversion element used at a high operation temperature of 500° C. or higher and including a laminate structure and electrodes. The laminate structure includes a plurality of p-type silicide substrates, and a plurality of n-type silicide substrates alternately laminated with each other, and adhesive layers each adhering the p-type and n-type silicide substrate adjacent to each other. The adhesive layer is made of a cured matter of an inorganic adhesive of a mixture of an inorganic binder and a filler. The electrodes are formed on the laminate structure and electrically connecting the p-type and n-type silicide substrates. The p-type and n-type silicide substrates have thicknesses of 0.5 mm or larger and 3.0 mm or smaller, the adhesive layer has a thickness of 0.5 mm or larger and 2.0 mm or smaller and has a thermal expansion coefficient of 7×10?6/° C. or larger and 16×10?6/° C. or smaller.

Abstract: A pyroelectric element includes a pyroelectric substrate; a light-receiving section composed of a front-side electrode, a back-side electrode, and a light-receiving portion; and a light-receiving section composed of a front-side electrode, a back-side electrode, and a light-receiving portion. Since the pyroelectric substrate warps in a cavity-facing region opposite a cavity, the light-receiving area of the light-receiving sections is greater than that in the case where there is no warp. It is thus possible to improve detection sensitivity of the pyroelectric element without making the size of the pyroelectric element larger than that in the case where there is no warp.

Abstract: A device for irradiating an electromagnetic wave irradiates an electromagnetic wave having a target frequency in a range of 0.1 THz to 30 THz to the outside of a non-linear optical crystal. The device includes a main body composed of a non-linear optical crystal and a sub wavelength grating structure formed on a surface of the main body. The sub wavelength grating structure includes column shaped bodies regularly arranged on a surface of the main body. Each of the column shaped bodies includes a constant width part having a constant width and a base part provided from the surface toward the constant width part. A surface of the base part has a shape of an arc having a center of curvature in the outside of the base part viewed in a cross section of the column shaped body cut along a direction in which the column shaped bodies are arranged.

Abstract: An optical modulation device 1 includes a supporting body 2 including a pair of grooves 2b, 2c and a protrusion 2d between the grooves, a ridge par 6 including a channel type optical waveguide capable of multi mode propagation, a first side plate part 3A formed in a first side of the ridge part 6, a second side plate part 3B formed in a second side of the ridge part, a first adhesive layer 4A adhering the first side plate part 3A and the supporting body 2, a second adhesive layer 4B adhering the second side plate part 3B and the supporting body 2, and a third adhesive layer 4C adhering the ridge part 6 and the protrusion 2d. The device 1 further includes a first electrode 7A provided on a side face 6b of the ridge part on the first groove side, and a side face 3b and an upper face 3c of the first side plate part, and a second electrode 7B provided on a side face 6c of the ridge part 6 in the second groove side, the second groove 2c and a side face 3b and an upper face 3c of the second side plate part 3B.

Abstract: An optical modulation device 1 includes a supporting body 2 including a pair of grooves 2b, 2c and a protrusion 2d between the grooves, a ridge par 6 including a channel type optical wave guide capable of multi mode propagation, a first side plate part 3A formed in a first side of the ridge part 6, a second side plate part 3B formed in a second side of the ridge part, a first adhesive layer 4A adhering the first side plate part 3A and the supporting body 2, a second adhesive layer 4B adhering the second side plate part 3B and the supporting body 2, and a third adhesive layer 4C adhering the ridge part 6 and the protrusion 2d. The device 1 further includes a first electrode 7A provided on a side face 6b of the ridge part on the first groove side, and a side face 3b and an upper face 3c of the first side plate part, and a second electrode 7B provided on a side face 6c of the ridge part 6 in the second groove side, the second groove 2c and a side face 3b and an upper face 3c of the second side plate part 3B.

Abstract: A device of irradiating an electromagnetic wave irradiates an electromagnetic wave having a target frequency in a range of 0.1 THz to 30 THz to the outside of a crystal. The device includes a main body 7 composed of a non-linear optical crystal and a sub wavelength grating structure 5 formed on a surface of the main body 7. The sub wavelength grating structure 5 includes column shaped bodies 6 regularly arranged on a surface 7a of the main body 7. Each of the column shaped bodies 6 includes a constant width part 6d having a constant width and a base part 6g provided from the surface toward the constant width part 6d. A surface 6b of the base part 6g has a shape of an arc having a center of curvature in the outside of the base part 6g viewed in a cross section of the column shaped body cut along a direction X or Y in which the column shaped bodies are arranged.

Abstract: It is provided a device oscillating an electromagnetic wave having a target frequency of 0.1 THz to 30 THz. The device includes a main body made of a non-linear optical crystal and a sub-wavelength grating structure formed on the main body. The sub-wavelength grating structure includes protrusions arranged in first direction “X” and second direction “Y” on the main body, first grooves 3X each provided between the adjacent protrusions and extending in the first direction, and second grooves 3Y each provided between the adjacent protrusions and extending in the second direction. Each of the protrusions includes a pair of first faces opposing in the first direction “X” with each other and a pair of second faces opposing in the second direction “Y” with each other. The width of the first face is made smaller from the main body 7 toward an upper end 2c of the protrusion 2.

Abstract: An optical waveguide device includes a ferroelectric layer having a thickness of 4 ?m-7 ?m; a supporting body; and an adhesive layer adhering a bottom face of the ferroelectric layer and supporting body. The ferroelectric layer includes a ridge comprising a channel optical waveguide, first and second protuberances on opposite sides of the ridge, inner grooves between the ridge and protuberances, respectively, and outer grooves outside of the protuberances, respectively. The outer groove is deeper than the inner groove. The ridge portion has a width of 6.6 ?m-8.5 ?m, a distance of an outer edge of the first protuberance and an outer edge of the second protuberance is 8.6 ?m-20 ?m, the inner groove has a depth of 2.0 ?m-2.9 ?m, and the outer groove has a depth of 2.5 ?m-3.5 ?m.

Abstract: A thin plate type vibration device 10 includes a vibration layer 2 composed of an oxide single crystal. The vibration layer 2 includes a first main face 2a and a second main face 2b, and further includes a fixed end part 2e, a free end part 2c and a central vibration part 2d provided between the fixed end part and free end part. The device 10 further includes an anchor part 7 composed of an oxide single crystal or a silicon single crystal and bonded to the fixed end part 2e of the vibration layer 2 at the first main face 2a. The device further includes a weight part 6 composed of an oxide single crystal or a silicon single crystal and bonded to the free end part 2c at the first main face 2a.

Abstract: It is provided a wavelength converting device oscillating an idler light having a wavelength of 5 to 10 ?m from a pump light. The wavelength of the idler light is longer than that of the pump light. The wavelength converting device includes a wavelength converting layer 5 of a semiconductor non-linear optical crystal and having a thickness of 50 ?m or smaller. The wavelength converting layer 5 includes a crystal orientation inversion structure wherein crystal orientation of the optical crystal is inverted at a predetermined period and at least one flat main face 5b. The device further includes a Peltier device 2 controlling a temperature of the wavelength converting layer 5; and a clad portion 4 joined with the flat main face 5b of the wavelength converting layer 5 and provided between the wavelength converting layer 5 and the Peltier device 2. The pump light, idler light and signal light satisfies a particular phase matching condition.

Abstract: A pyroelectric element includes a pyroelectric substrate being a substrate of lithium tantalate single crystal having an X-axis, a Y-axis, and a Z-axis as crystal axes; front-side electrodes disposed on a front side of the pyroelectric substrate; and back-side electrodes paired with the front-side electrodes, respectively. The pyroelectric substrate is a Y-offcut plate obtained by cutting the lithium tantalate single crystal at an angle turned by a cut angle ? from the Y-axis toward the Z-axis about the X-axis that coincides with a direction along the electrode plane, and the cut angle ? is 30° to 60° or 120° to 150°. The pyroelectric substrate is preferably 10 ?m or less in thickness, and is more preferably 5 ?m to 10 ?m in thickness.

Abstract: An optical modulator includes an optical modulation substrate, an electrical length adjusting substrate, a package containing the substrates, and a plurality of input ports for inputting high frequency electrical signals. The optical modulation substrate includes a substrate body made of an electro-optic material, a ground electrode and a plurality of signal electrodes provided on the substrate body, optical waveguides propagating lights interacting with the signal electrodes, respectively, and electrode input ports inputting the high frequency electrical signals into the signal electrodes, respectively. The signal electrode includes an interacting part, an input end part provided between the electrode input port and interacting part, and a terminal part. The electrical length adjusting substrate includes conductive lines connected to the input ports for inputting the high frequency electrical signals, respectively.

Abstract: A device of oscillating an electromagnetic wave having a frequency of 0.1 THz to 3 THz from pump and idler waves by parametric effect. The device includes a supporting body, an oscillating substrate of a non-linear optical crystal, an adhesive layer adhering the supporting body and the oscillating substrate, and a film for reflecting the electromagnetic wave formed on a surface of the supporting body on the side of the adhesive layer. The oscillating substrate has an upper face, a bottom face and an incident face on which the pump wave is made incident, with the adhesive layer having a refractive index with respect to the pump wave lower than that of the oscillating substrate.

Abstract: A pyroelectric element includes a pyroelectric substrate being a substrate of lithium tantalate single crystal having an X-axis, a Y-axis, and a Z-axis as crystal axes; front-side electrodes disposed on a front side of the pyroelectric substrate; and back-side electrodes paired with the front-side electrodes, respectively. The pyroelectric substrate is a Y-offcut plate obtained by cutting the lithium tantalate single crystal at an angle turned by a cut angle ? from the Y-axis toward the Z-axis about the X-axis that coincides with a direction along the electrode plane, and the cut angle ? is 30° to 60° or 120° to 150°. The pyroelectric substrate is preferably 10 ?m or less in thickness, and is more preferably 5 ?m to 10 ?m in thickness.

Abstract: A pyroelectric element includes a pyroelectric substrate; a light-receiving section composed of a front-side electrode, a back-side electrode, and a light-receiving portion; and a light-receiving section composed of a front-side electrode, a back-side electrode, and a light-receiving portion. Since the pyroelectric substrate warps in a cavity-facing region opposite a cavity, the light-receiving area of the light-receiving sections is greater than that in the case where there is no warp. It is thus possible to improve detection sensitivity of the pyroelectric element without making the size of the pyroelectric element larger than that in the case where there is no warp.

Abstract: An oscillating device includes an oscillating substrate of a non-linear optical crystal and having an incident face where a pump wave and an idler wave are made incident; a first waveguide provided in the oscillating substrate and between the incident face and an interacting part of the pump wave and idler waves; and a second waveguide provided in the oscillating substrate and between the incident face and the interacting part. The first waveguide guides the pump wave and the second waveguide guides the idler wave.

Abstract: A device for oscillating an electromagnetic wave having a frequency of 0.1 THz to 3 THz from pump and idler waves by a parametric effect. The device includes a supporting body, an oscillating substrate made of a non-linear optical crystal, and an adhesive layer adhering the supporting body and oscillating substrate. The oscillating substrate includes an upper face, a bottom face and an incident face on which the pump wave is made incident. The oscillating substrate provides cut-off with respect to the electromagnetic wave oscillated by the parametric effect when the pump and idler waves propagate in parallel with the bottom face.

Abstract: An optical waveguide device includes a substrate of a ferroelectric material, at least a pair of electrodes 4A, 4B provided on one main face of the substrate, and a channel-type optical waveguide 5A formed in a gap 1 of the pair of the electrodes. The optical waveguide 5A has a curved part 15. A central line C of the gap 1 is provided outside of a center line WC of the optical waveguide with respect to the center O of curvature of the curved part 15.