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. 08, 2003
Filed:
Oct. 23, 2001
John M. Lannon, Jr., Raleigh, NC (US);
David E. Dausch, Raleigh, NC (US);
Dorota Temple, Cary, NC (US);
MCNC, Research Triangle Park, NC (US);
Abstract
The present invention provides for an improved polarized-light detector device. The device comprises a photodiode having a first contact disposed on the backside of a light-sensing medium and a second contact disposed on the frontside of the light-sensing medium. A spin filter medium is disposed between the backside of the light-sensing medium and the first contact. The application of a magnetic field aligns the magnetic moments in the spin-filter medium to cause the device to discriminate between different polarizations of an optical signal. The polarization discrimination is affected by introducing a net magnetization into the spin filter medium, thereby allowing selected spin-polarized electrons to either be transmitted through the spin filter medium to the point of detection or deflected from further transmission. Additionally, the invention is embodied in a polarization-selective-light detector array and methods for discriminating a polarized optical signal and selective optical wavelength detection.