Abstract:
A quasi-optical waveguide apparatus includes a waveguide having a chamber formed by a substantially cylindrical body and configured to propagate terahertz radiation. A plurality of windows are included wherein each window is coupled to a respective end of the waveguide such that the chamber is substantially sealed from the ambient atmosphere. The plurality of windows are transparent to the terahertz radiation.
Abstract:
An apparatus is described that selectively absorbs electromagnetic radiation. The apparatus includes a conducting surface, a dielectric layer formed on the conducting surface, and a plurality of conducting particles distributed on the dielectric layer. The dielectric layer can be formed from a material and a thickness selected to yield a specific absorption spectrum. Alternatively, the thickness or dielectric value of the material can change in response to an external stimulus, thereby changing the absorption spectrum.
Abstract:
An apparatus and method that reduces laser speckle by using stimulated Raman scattering in an optical fiber (710, 718). The fiber core diameter and length are selected to achieve a desired output color. An adjustable despeckler is formed by combining two optical fibers (710, 718) in parallel and adjusting the amount of light in each path with the help of a rotatable waveplate (704) and a pola7rizer (706) as a beam splitter. A homogenizing device (722) illuminates a projector (724).
Abstract:
An apparatus and method that reduces laser speckle by using stimulated Raman scattering in an optical fiber. The fiber core diameter and length are selected to achieve a desired output color. An adjustable despeckler is formed by combining two optical fibers in parallel and adjusting the amount of light in each path.
Abstract:
An electromagnetically responsive element includes an arrangement of self-resonant bodies, such as atoms or quantum dots that form an effective dielectric constant, typically at or near a resonance.
Abstract:
A method and apparatus (100) for configuring and tuning a crystal (102, 106) by selectively controlling a fluid (400) supplied to a plurality of nodes (106) within a substrate (102). The apparatus comprises a substrate (102) having at least one node (106) that can be selectively supplied with a liquid (400) that will change the material property of the node. The node may be a spherical cavity (702) in a three-dimensional structure, a cylindrical aperture (106) in two-dimensional structure, or a cavity (1106) in a one-dimensional structure. The node or nodes in the substrate are coupled to a fluid distribution assembly (104) that selectively alters the material property of the nodes. The material property may be changed by moving the fluid or material in a fluid, using electrohydrodynamic pumping, electroosmotic pumping, electrophoresis, thermocapillarity, electrowetting or electrocapillarity. The change in the material property in at least one of the nodes changes the electromagnetic radiation filtering or switching characteristics of the crystal.