Abstract: An optical frequency converter includes a waveguide including a core made of a nonlinear optical medium having a refractive index n1,light in a wavelength region of light, and cladding disposed so as to cover the core and made of a material whose refractive index n2,light in the wavelength region of light is lower than the refractive index n1,light, and a coupling section made of a material whose refractive index n3,THz in a wavelength region of a terahertz wave is higher than the refractive index n1,light and disposed in contact with the cladding. The coupling section is configured to couple the waveguide with a space in the wavelength region of the terahertz wave. The coupling section covers the cladding.

Abstract: A power transmission device that includes an electromagnetic wave-shielding wall partitioning a space and a space, a rotating shaft penetrating through the electromagnetic wave-shielding wall to transmit rotating drive force, and a bearing supporting the rotating shaft. The rotating shaft includes a first shaft member supported by the bearing, a shaft joint part provided on an end of the first shaft member, and a second shaft member rotating together with the first shaft member. The first shaft member and the second shaft member are formed of a conductive material, and the shaft joint part has an insulating part formed of an insulating material. An outer race component part of the bearing has an annular close-contact surface formed of a conductive material.

Abstract: An oscillation device for oscillating a terahertz wave includes a substrate, an active layer which is provided on an upper portion of the substrate and which generates a terahertz wave by intersubband transition of carrier, and a luminous layer which is provided on an upper portion of the substrate and which generates light by interband transition of carrier. In addition, the luminous layer is arranged at a position at which the light generated in the luminous layer can radiate on the active layer.

Abstract: An oscillator includes a resonator section structured such that a dielectric is interposed between first and second conductors and such that the first and second conductors are electrically connected to a resonant tunneling diode, a capacitor section structured such that the dielectric is interposed between the first and second conductors, a line section configured to electrically connect the resonator section and the capacitor section in parallel to each other, and a resistor section configured to electrically connect the first and second conductors to each other. A first position of the resonator section and a second position of the capacitor section are connected to each other by the line section so that the first position and the second position are substantially electrically equivalent to each other in a wavelength range larger than a wavelength of an electromagnetic wave that resonates in the resonator section.

Abstract: Provided is a waveguide for guiding an electromagnetic wave between a first conductor layer and a second conductor layer each having a negative dielectric constant real part for the electromagnetic wave, the waveguide including a tapered structure in a part of the waveguide at which the electromagnetic wave exits or enters, in which a spatial profile of the tapered structure perpendicular to an optical axis extends to both sides with respect to the optical axis at least in one direction orthogonal to the optical axis as being closer to an opening plane at an outermost part of the tapered structure.

Abstract: To provide a resonator that includes a resonant tunneling diode. A resistor layer provided in series with the resonant tunneling diode, a dielectric provided in contact with the resonant tunneling diode, and first and second conductors that are placed so that the resonant tunneling diode and the dielectric are sandwiched therebetween are provided. Further, a resonator area where the dielectric is sandwiched between the first and second conductors, and a resistor area where the resonant tunneling diode and the resistor layer are sandwiched between the first and second conductors are provided in parallel with each other.

Abstract: Provided are a waveguide with which strain and defect caused by a manufacturing process or the like or caused in a semiconductor in an initial stage or during operation are suppressed so that improvement and stabilization of characteristics are expected, and a method of manufacturing the waveguide. A waveguide includes a first conductor layer and a second conductor layer that are composed of a negative dielectric constant medium having a negative real part of dielectric constant with respect to an electromagnetic wave in a waveguide mode, and a core layer that is in contact with and placed between the first conductor layer and the second conductor layer, and includes a semiconductor portion. The core layer including the semiconductor portion has a particular depressed and projected structure extending in an in-plane direction.

Abstract: Provided are a waveguide capable of suppressing strain and defect caused in a semiconductor in an initial stage or during operation due to a manufacturing process or the like to realize improvement and stabilization of characteristics such as oscillation characteristics, and a method of manufacturing the waveguide. A waveguide includes a first conductor layer and a second conductor layer that are composed of a negative dielectric constant medium having a negative real part of dielectric constant with respect to an electromagnetic wave in a waveguide mode, and a core layer that is in contact with and placed between the first conductor layer and the second conductor layer, and includes a semiconductor portion. At least the first conductor layer has a particular depressed and projected structure extending in an in-plane direction.

Abstract: The present invention relates to an oscillator. The oscillator includes a resonator unit configured to resonate terahertz waves generated by an active layer using intersubband transitions of a carrier. The oscillator further includes a strain generating unit configured to generate strain of the active layer. Still furthermore, the oscillator includes a control unit configured to control the strain generating unit in accordance with the oscillation characteristic (the frequency or the output) of the terahertz waves resonated by the resonator unit.

Abstract: An oscillation circuit including: a negative resistance element; a resonance circuit connected to the negative resistance element; and a stabilization circuit connected in parallel with the negative resistance element to suppress parasitic oscillation, wherein the stabilization circuit includes a variable shunt resistor and a adjusting device for adjusting the shunt resistor.

Abstract: A sole and footwear provided with such soles are capable of properly controlling the movement of a foot pressure center, using a simple configuration. This sole includes: a sole body (41) which forms each bottom part of the footwear; and a foot pressure protrusion portion (43) which is provided in this sole body (41), and guides a foot pressure center corresponding to the center of a pressure applied to the bottom of each foot that moves when a person walks or runs, along a predetermined foot pressure center route from the heel toward the vicinity of the root of the fourth toe.

Abstract: To provide a resonator that includes a resonant tunneling diode that can generate an electromagnetic wave. In the resonator, the resonant tunneling diode and a resistor layer are sandwiched between first and second conductors in a direction approximately perpendicular to the in-plane direction of the resonant tunneling diode. Further, the in-plane cross-sectional area of the resistor layer is larger than that of the resonant tunneling diode. Further, the width of the in-plane cross-sectional area of the resistor layer is more than twice as large as the skin depth of an electromagnetic wave to be caused to resonate.

Abstract: An optical frequency converter includes a waveguide including a core made of a nonlinear optical medium having a refractive index n1,light in a wavelength region of light, and cladding disposed so as to cover the core and made of a material whose refractive index n2,light in the wavelength region of light is lower than the refractive index n1,light, and a coupling section made of a material whose refractive index n3,THz in a wavelength region of a terahertz wave is higher than the refractive index n1,light and disposed in contact with the cladding. The coupling section is configured to couple the waveguide with a space in the wavelength region of the terahertz wave. The coupling section covers the cladding.

Abstract: An oscillator includes a resonator section structured such that a dielectric is interposed between first and second conductors and such that the first and second conductors are electrically connected to a resonant tunneling diode, a capacitor section structured such that the dielectric is interposed between the first and second conductors, a line section configured to electrically connect the resonator section and the capacitor section in parallel to each other, and a resistor section configured to electrically connect the first and second conductors to each other. A first position of the resonator section and a second position of the capacitor section are connected to each other by the line section so that the first position and the second position are substantially electrically equivalent to each other in a wavelength range larger than a wavelength of an electromagnetic wave that resonates in the resonator section.

Abstract: Provided is a power transmission device in which leakage of an electromagnetic wave between a space (1) and a space (2) can be suppressed. The power transmission device includes an electromagnetic wave-shielding wall (10) partitioning the space (1) and the space (2), a rotating shaft (20) penetrating through the electromagnetic wave-shielding wall (10) to transmit rotating drive force, and a bearing (80) supporting the rotating shaft (20). The rotating shaft (20) includes a first shaft member (30) pivotally supported by the bearing (80), a shaft joint part (50) provided on an end (31) of the first shaft member (30), and a second shaft member (40) rotating together with the first shaft member (30). The first shaft member (30) and the second shaft member (40) are formed of a conductive material, and the shaft joint part (50) has an insulating part (51) formed of an insulating material.

Abstract: An oscillation device for oscillating a terahertz wave includes a substrate, an active layer which is provided on an upper portion of the substrate and which generates a terahertz wave by intersubband transition of carrier, and a luminous layer which is provided on an upper portion of the substrate and which generates light by interband transition of carrier. In addition, the luminous layer is arranged at a position at which the light generated in the luminous layer can radiate on the active layer.

Abstract: An electromagnetic-wave oscillator includes a substrate, an EMW oscillating unit including a gain portion, an EMW resonance portion, an EMW radiating portion, and a ground (GND) portion, and a supplying unit for supplying electric power to the EMW oscillating unit. The ground portion regulates a predetermined reference electric potential for the gain portion, the EMW resonance portion, and the EMW radiating portion. The EMW oscillating unit is disposed on a first surface of the substrate. The supplying unit is disposed on a second surface of the substrate extending on an opposite side to the first surface. The EMW oscillating unit and the supplying unit are electrically connected via a penetrating electrode formed in the substrate.

Abstract: A resonant tunneling structure for generating oscillation with multiple fundamental oscillation frequencies is provided. A first quantum well layer has a second sub-band (E2). A second quantum well layer has a first sub-band (E1) and a third sub-band (E3). When no electric field is applied, the resonant tunneling structure satisfies “(Eb1, Eb2)<E1<E2<E3”, where band edge energies of a first and second electrical contact layers relative to a carrier are expressed by Eb1 and Eb2, respectively. When a first electric field (Va) is applied, a resonant tunneling phenomenon is caused by the third sub-band and the second sub-band. When a second electric field (Vb) different in polarity from the first electric field is applied, a resonant tunneling phenomenon is caused by the second sub-band and the first sub-band.

Abstract: A training apparatus trains shoulders, arms, and a rear parts without hardening of the muscles, muscle pain and fatigue. It includes a seat part 2, a load application part 3 with load adjustment, right and left guide poles 4 extending vertically with a predetermined interval so that the seat part 2 is in their center position, two lifting parts 5 guided by the right and left guide poles 4, respectively, to be movable up and down, rotating parts 7 connected to shafts 6 rotatable with respect to the lifting parts 5, pulling members 8 connected to the load application part 3 and the lifting parts 5, and load transmission parts 9 connected to the other ends of the pulling members 8 in the lifting parts 5, respectively, and apply load to rotation of the rotating parts 5 about the shafts 6 by the load application part 3.

Abstract: To provide a resonator that includes a resonant tunneling diode that can generate an electromagnetic wave. In the resonator, the resonant tunneling diode and a resistor layer are sandwiched between first and second conductors in a direction approximately perpendicular to the in-plane direction of the resonant tunneling diode. Further, the in-plane cross-sectional area of the resistor layer is larger than that of the resonant tunneling diode. Further, the width of the in-plane cross-sectional area of the resistor layer is more than twice as large as the skin depth of an electromagnetic wave to be caused to resonate.