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:
Nov. 21, 2006
Filed:
Jan. 06, 2004
Malcolm C. Smith, Winchester, MA (US);
Richard S. Payne, Andover, MA (US);
Malcolm C. Smith, Winchester, MA (US);
Richard S. Payne, Andover, MA (US);
Polychromix Corporation, Wilmington, DE (US);
Abstract
A reflective diffraction grating having grooves and ridges and providing high throughput efficiency in the minus-first diffraction order. All but the zeroth diffraction order and the minus-first diffraction order may be prevented from existence by directing the radiation onto the grating at an appropriate angle. The radiation having a TM polarization is eliminated from the zeroth order by destructive interference by appropriate selection of a the groove width of the grating, and radiation having a TE polarization is eliminated from the zeroth order by destructive interference by depositing an overcoat of an appropriate thickness. A dielectric material may be deposited in the grooves.