US 2008/0174736 A1 · Mobile Charge Induced Periodic Poling and Device

Abstract

Devices and methods are disclosed for realizing a high quality bulk domain grating structure utilizing mobile charges that are generated by means of photo-excitation in a substrate. An effect of light exposure (UV, visible, or a combination of wavelengths) is to generate photo-induced charges. The application of a voltage across the substrate combined with the application of light exposure causes a photo-induced current to flow through the substrate. The photo-induced charges (behaving like virtual electrode inside the material) and the photo-induced current result in both reduction of the coercive field required for domain inversion in the material and improve realization of the domain inversion pattern, which previously has not been possible at room temperature.

Claims56

Dependent claims

A domain grating device, comprising:

a substrate with first and second opposing surfaces, the substrate having an inverted domain grating structure comprising a plurality of inverted domains that extend through the entire substrate,
wherein an inverted domain average duty cycle at the first surface is greater than 50% and less than 100% and an inverted domain average duty cycle at the second surface is less than 50% and greater than 0%, and
wherein a length of an inverted domain at the second surface is less than a length of the inverted domain at the first surface.

Dependencies are inferred from the claim text.

Facts

Application

12/034,138Filed 20 Feb 2008

Priority

8 Sep 2006

Published

24 Jul 2008

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

G03B 21/14
Projectors or projection-type viewers; Accessories therefor: details
G02F 1/3544
Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams:…
G02F 1/3558
Characterised by the materials used: poled materials, e.g. with periodic poling; Fabrication of domain inverted structures, e.g. for…
G02F 1/3775
In an optical waveguide structure: with a periodic structure, e.g. domain inversion, for quasi-phase-matching [QPM]

Mobile Charge Induced Periodic Poling and Device

Life of this patent

Mobile Charge Induced Periodic Poling and Device

Life of this patent

Abstract

Claims56