Accession Number : ADD014332

Title :   Fast Optical Switch and Limiter Using Quantum Size Effect in Metal Grain Composites.

Descriptive Note : Patent Application, Filed 7 Aug 89,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Haus, Joseph W ; Kalyaniwalla, Nauser ; Inguva, Ramarao ; Rowden, Charles M

Report Date : 07 Aug 1989

Pagination or Media Count : 10

Abstract : A block of composite material includes a dielectric material with a dielectric constant of epsilon sub d = 4.66 and which is at least 4 micrometers thick and has electrically conductive microparticles randomly distributed throughout. The composite material exhibits an optical bistability without cavity feedback. The microparticles must be nearly uniform in size and of spherical diameter much smaller than the wavelength of light in the particle. The composite, when illuminated by laser light in the range of 500 nm and of varying intensity, becomes opaque at a critical input intensity and stays opaque until the input intensity reaches a certain level both below and above the intensity at which it initially became opaque. Thus the material behaves as an optical switch and a limiter. Patent applications. (jhd)

Descriptors :   *LIMITERS, *OPTICAL SWITCHING, *PATENT APPLICATIONS, *QUANTUM ELECTRONICS, CAVITIES, COMPOSITE MATERIALS, CONSTANTS, DIELECTRIC PROPERTIES, DIELECTRICS, ELECTRICAL CONDUCTIVITY, FEEDBACK, ILLUMINATION, INPUT, INTENSITY, LASER BEAMS, PARTICLES

Subject Categories : Electrooptical and Optoelectronic Devices
      Electrical and Electronic Equipment
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE