Reflector (antenna)

About: Reflector (antenna) is a research topic. Over the lifetime, 28730 publications have been published within this topic receiving 212618 citations.

Distributed reflector and wavelength-tunable semiconductor laser

Abstract: The distributed reflector includes a substrate and at least one optical waveguide formed on the substrate and having a refractive index larger than the substrate and at least one optical confinement layer having a refractive index smaller than the optical waveguide layer. A diffractive grating is formed in at least one layer constituting the optical waveguide. The diffractive grating has a structure of which at least one parameter defining optical reflectivity varies depending on its position, and is formed continuously for at least two periods, the period being approximately defined by the length of repeating unit region. The parameter may be pitch, coupling coefficient, bandgap composition, phase shift, etc. The semiconductor laser includes the distributed reflector which may be of a distributed reflector type or distributed feed back type and has distributed reflector regions and a phase adjustment region. Application of current or voltage to the refractive index of the active region or inactive region in which a diffractive grating is present or absent adjusts the refractive index thereof and enables coarse and fine adjustment of lasing wavelength.

Lithographic Apparatus, and Device Manufacturing Method

Abstract: PURPOSE: A lithographic apparatus and a device manufacturing method are provided to be capable of detecting position error and disturbances of a reflector by real-time CONSTITUTION: A reflector alignment system(10) uses an alignment beam(AB1) propagating through a projection system(PL) comprising a mirror group to measure the apparent relative positions of two reference markers fixed to a reference frame(RF) on opposite sides of the projection system The movement of mirrors in the projection system(PL) detects as a shift in the apparent position of a plurality reference markers(11,14)

Optically integrating pixel microstructure

Abstract: An integrated optical microstructure includes a substrate (245) carrying an optical waveguide (240) and supporting a medium (210) disposed to receive optical energy from the waveguide. The medium includes an optical re-radiator such as a phosphor (225), which re-radiates optical energy in response to optical energy received from the waveguide. The structure further includes a reflector (250, 255, 260) disposed to redirect some of the input optical energy emanating from the medium back into the medium, to achieve spatial confinement of the input light delivered by the input waveguide. The structure can thereby increase the efficiency of the light conversion processes of re-radiating materials. An aperture (235) in the reflector permits optical energy emitted by the re-radiator to emerge from the structure and to propagate in a preferred direction, such as toward a viewer or sensor. The structure is useful for increasing the brightness of various kinds of small emissive elements which are excited by light delivered from an integrated optical waveguide, including pixels in an information display.

Variable beamwidth stage light.

Abstract: A variable beamwidth stage light having an axially movable reflector (18) for changes in beamwidth. The reflector has a plurality of radially outwardly and axially forwardly extending leaves in side-by-side relation defining a bowl-shaped reflector surface. A stationary support flange (58) frictionally contacts the radially outward surface of each leaf. The reflector base (26) is sandwiched between a base member (28) and a ring member (24). A motor driven lead screw (30) is attached to the base member to move the reflector axially relative to the support flange. The reflector defines first and second focal points along the axis of the reflector. A light source (16) is fixed at the first focal point, which remains substantially fixed relative to the base member. Contact of the support flange with the reflector leaves causes the diameter of the reflector leaves to vary as the base member is moved, thereby displacing the second focal point and varying the beamwidth issuing from the reflector.

Application of broadband infrared reflector based on cholesteric liquid crystal polymer bilayer film to windows and its impact on reducing the energy consumption in buildings

Abstract: An infrared (IR) polymer reflector based on chiral nematic (cholesteric) liquid crystals has been fabricated which can reflect more than 60% of solar IR energy without interfering with the visible solar radiation. Simulations show that the polymer bilayer film applied to a window of a typical building can have a significant impact on the interior temperature in living and working spaces.