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:
Mar. 01, 2011
Filed:
Sep. 17, 2009
Bruce W. Wessels, Wilmette, IL (US);
Pao T. Lin, Evanston, IL (US);
Bruce W. Wessels, Wilmette, IL (US);
Pao T. Lin, Evanston, IL (US);
Northwestern University, Evanston, IL (US);
Abstract
Apparatus and methods for second harmonic generation with a waveguide. In one embodiment, a method includes the steps of providing a waveguide, wherein the waveguide has a substrate, and a polydomain epitaxial thin film on the substrate, wherein the polydomain epitaxial thin film defines a plane and has a first surface and a second, opposite surface defining a body portion of the polydomain epitaxial thin film therebetween with a film thickness, l, and wherein the polydomain epitaxial thin film has a coherence length, l, and exposing the waveguide to an incident photon beam with a wavelength and a focal point such that the incident photon beam is incident to the plane of the polydomain epitaxial thin film with an angle θ that is formed between the incident beam and the plane of the polydomain epitaxial thin film and satisfies the condition of 0<θ<90, wherein the polydomain epitaxial thin film is formed with the following condition satisfied: l<l. As generated, the second harmonic generation has a conversion efficiency substantially independent of the wavelength of the incident photon beam over the visible spectra range.