US 2013/0155516 A1 · NANO FRACTAL DIFFUSER

Abstract

A diffusive device has an array of discrete facets which may be of a size and pattern similar to a fractal. The facet dimensions can be greater than half the wavelength of incident light such that the facets substantially diffract light. A polarizing wire-grid layer comprised of an array of elongated parallel conductive wires with a period less than half the wavelength of incident light may be disposed between, beneath, or above the facets. The wire-grid polarizes the light by substantially reflecting light having an s-polarization orientation and substantially transmitting a portion of light having a p-polarization orientation.

Claims20

Dependent claims

A light diffuser comprising:

a. a substrate having a top surface and a bottom surface;
b. a layer disposed over the top surface of the substrate;
and
c. at least sixteen facets:
i. having at least two different sizes;
ii. having a bottom surface disposed towards the substrate and a top surface opposing the bottom surface;
iii. formed in the layer with facet dimensions >λ/2, where λ is the wavelength of light incident on the at least sixteen facets to create a substantially diffuse light beam;
and
iv. forming distinct groups arranged in a fractal pattern.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/495,296Filed 13 Jun 2012

Priority

25 Jun 2009

Published

20 Jun 2013

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

G02B 5/02
Optical elements other than lenses: diffusing elements; Afocal elements
G02B 5/0252
Characterised by the diffusing properties: using holographic or diffractive means
G02B 5/1814
Diffraction gratings: structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings
G02B 5/3058
Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state: comprising electrically…

Nano fractal diffuser

Life of this patent

Nano fractal diffuser

Life of this patent

Abstract

Claims20