Karen Odonnell Long

US Patent:

8519382, Aug 27, 2013

Filed:

Feb 25, 2011

Appl. No.:

12/932934

Inventors:

Kevin A. Boulais - La Plata MD, US
Donald W. Rule - Silver Spring MD, US
Karen J. Long - Upper Marlboro MD, US
Francisco Santiago - Fredericksburg VA, US
Pearl Rayms-Keller - Fredericksburg VA, US

Assignee:

The United States of America as Represented by the Secretary of the Navy - Washington DC

International Classification:

H01L 35/24

US Classification:

257 40, 257E51001

Abstract:

A photocapacitor device is provided for responding to a photon having at least a specified energy. The photocapacitive device includes a first portion composed of a photocapacitive material; a second portion composed of a non-photocapacitive material; and a depletion region disposed between the first and second portions. The photocapacitive and non-photocapacitive materials respectively have first and second Fermi-energy differences, with the second Fermi-energy difference being higher than the first Fermi-energy difference.

US Patent:

20140061507, Mar 6, 2014

Filed:

Aug 28, 2012

Appl. No.:

13/573279

Inventors:

Kevin A. Boulais - LaPlata MD, US
Alfredo N. Rayms-Keller - Fredericksburg VA, US
Michael S. Lowry - Fredericksburg VA, US
Francisco Santiago - Fredericksburg VA, US
Karen J. Long - Upper Marlboro MD, US
Walter D. Sessions - King George VA, US
Natasha Laguodas Wilkerson - College Park MD, US
Reniery Cevallos - King George VA, US

Assignee:

United States Government, as Represented by the Secretary of the Navy - Arlington VA

International Classification:

H01B 3/02

US Classification:

2504921, 252600

Abstract:

A material is provided for switching dielectric constant between distinct first and second values responsive to electromagnetic radiation having a specified energy. The material includes a medium transparent to the radiation and a plurality of particulates. Each particulate has a dipole that assumes one of distinct first and second parameters that correspond to the first and second values. The particulates are suspended within the medium. The parameters are either dipole span or charge strength. The dipole of each particulate sets to the first parameter by default and sets to the second parameter in response to the radiation. The particulates can be composed from undoped semi-insulating gallium arsenide. The medium can be polymethylmethacrylate, for example.