Methods and apparata for direction-selective filtering and applications thereof
US11054660B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 2018 |
| Grant date | Jul 6, 2021 |
| Priority date | — |
| Expiry date | Aug 2, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B30/25
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A multi-layer optical device may include one, two, or three layers. A first layer may include an array of Fourier-transforming optically transmissive elements to map optical radiation between each of a plurality of angles of incidence and corresponding coordinate locations proximate each respective optically transmissive element. A second layer may provide a modulation matrix of optically modulating sub-elements optically coupled to the array of transmissive elements, where each optically modulating sub-element corresponds to one of the coordinate locations of the first layer mapping. A third layer includes an array of inverse Fourier-transforming optically transmissive elements to inverse-map optical radiation from the optically modulating sub-elements of the modulation matrix for propagation at angles corresponding to the angles of incidence from which the optical radiation was received.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.