The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 25, 2000
Filed:
Mar. 31, 1998
Applicant:
Inventors:
Mark A Dodd, Arlington, TX (US);
Lewis T Claiborne, Richardson, TX (US);
Assignee:
Lockheed Martin Corporation, Bethesda, MD (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ; H01L / ;
U.S. Cl.
CPC ...
257 10 ; 257 11 ; 257 21 ; 257189 ; 257432 ; 257459 ;
Abstract
An infrared photocathode comprises an infrared radiation absorbing structure based on multiple quantum well (MQW) material on top of an electron conducting contact layer having a negative electron affinity back surface. In the first photocathode, a top contact layer is etched to form a transmissive diffraction grating to aid photon absorption in the MQW material. In the second photocathode, a plurality of spaced apart MQW structures form a diffraction grating which aids photon absorption in the MQW material.