Nippon Sheet Glass Company, Limited

Other

Masatoshi Nara

Shigeo Kittaka

Keiji Tsunetomo

Kazuaki Oya

Takahiro Asai

Masahiro Hirata

Akira Fujisawa

Tatsuhiro Nakazawa

Yukio Sueyoshi

Koichiro Kiyohara

Kiyotaka Ichiki

Hiroki Ando

A waveguide elementincluding a photonic crystal waveguide including a corethat is constituted by a photonic crystal having a refractive index periodicity at least in one direction, and that propagates an electromagnetic wave in a direction in which the photonic crystal does not have the refractive index periodicity. At least one of materials forming the coreconstituted by the photonic crystal, and at least a portion of a cladding in contact with a side face of the coreare constituted by a fluid. Thus, it is possible to provide a waveguide element that can be used as a light control element, can be produced easily and also can be applied to an optical sensor.

Waveguide element, method for producing the waveguide element, and optical sensor

A transparent conductive film wherein the height number distribution of projections present on the surface is expressed by a distribution function of &#x3c7;type having a degree of freedom of 3.5 to 15 when the unit of the horizontal axis is a nanometer, the height/width ratio number distribution is expressed by a distribution function of &#x3c7;type having a degree of freedom of 10-35&#x3c7;, the projections having a height of 50-350 nm account for 70% of more, and the projections having a height/width ratio of 0.25-1.02 account for 90% or more.

Transparent conductive film and its manufacturing method, and photoelectric conversion device comprising it

In a waveguide element using a photonic crystal including a core formed of a photonic crystal having a refractive index periodicity in at least two directions perpendicular to a propagation direction of an electromagnetic wave and a cladding arranged in contact with the core in order to confine the electromagnetic wave in the core, an incident side phase modulation portion is provided for allowing an electromagnetic wave that is coupled to a band on or near a Brillouin zone boundary in a photonic band structure in the core and propagates in the core to enter the core.

Waveguide element using photonic crystal

An optical element, composed of an one-dimensional photonic crystal of a triangular prism shape and a multilayer film and a phase modulation unit are used together, with the phase modulation unit adjacent or abutting to a light input end surface of the optical element. Input light is phase-modulated by the phase modulation unit in the same period and direction as those of photonic crystal so that only specific high-order band light can be propagated through the optical element. When this optical element is formed in an optical waveguide, a small-size spectroscopic device having high resolving power can be provided.

Optical element using one-dimensional photonic crystal and spectroscopic device using the same

An optical element according to the invention constituted by a multilayer structure having a periodic structural portion as at least one region constituted by repetition of a predetermined period, wherein an end surface of the multilayer structure not parallel to layer surfaces of the multilayer structure is used as a light input surface whereas one or each of opposite surfaces of the multilayer structure parallel to the layer surfaces is used as a light output surface. There is an intermediate layer between a medium and a surface of the multilayer structure, the intermediate layer having a refractive index less than the refractive index of the medium. The periodic structural portion of the multilayer structure can be regarded as a one-dimensional photonic crystal. Refracted light from the one-dimensional photonic crystal has good directivity and the direction of the refracted light has strong dependence on wavelength. When this wavelength dependence property is used, a spectroscopic device or a polarized light separating device of high resolution can be achieved without increase in device size.

Optical element and spectroscopic device using the same

An optical element according to the invention uses a thin film-like two-dimensional photonic crystal having a structure of periodic repetition in two directions perpendicular to each other. When the two periodic directions are Y-axis and Z-axis directions, opposite surfaces of the photonic crystal structure perpendicular to the Z-axis direction and parallel to the Y-axis direction are used as a light input surface and a light output surface respectively. The direction of movement of light rays incident onto the light input surface is decided so that it is parallel to the YZ plane and inclined at a predetermined inclination angle to the Z-axis direction.

Optical element

In the invention, light incident onto an end surface of one-dimensional photonic crystal is phase-modulated in the same period and direction as those of the photonic crystal to thereby propagate only specific high-order band light in the photonic crystal. That is, a phase modulation unit for generating phase-modulated wave having the same period as that of the periodic structure is disposed adjacent or close to a light incident surface of the periodic structure.

In a transparent layered product in which a coating film having a surface with roughness is formed on a glass sheet, the reflectance of the transparent layered product is decreased by controlling the refractive index distribution in a transition layer produced by the roughness. In the transition layer present at the surface of the coating film, in which the refractive index varies continuously in its thickness direction, the variation in refractive index in the thickness direction was indicated by a convex curve over the whole area of the transition layer, when the variation is shown on a plane defined by a horizontal axis indicating a refractive index and the vertical axis indicating the thickness direction of the transition layer, with the glass sheet positioned on the lower side.

Growing community of inventors

Osaka, Japan

Masatoshi Nara