Sub-wavelength efficient polarization filter (SWEP filter)
US6661952B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 2001 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | Jun 15, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/30
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A polarization sensitive filter includes a first sub-wavelength resonant grating structure (SWS) for receiving incident light, and a second SWS. The SWS are disposed relative to one another such that incident light which is transmitted by the first SWS passes through the second SWS. The filter has a polarization sensitive resonance, the polarization sensitive resonance substantially reflecting a first polarization component of incident light while substantially transmitting a second polarization component of the incident light, the polarization components being orthogonal to one another. A method for forming polarization filters includes the steps of forming first and second SWS, the first and second SWS disposed relative to one another such that a portion of incident light applied to the first SWS passes through the second SWS. A method for separating polarizations of light, includes the steps of providing a filter formed from a first and second SWS, shining incident light having orthogonal polarization components on the first SWS, and substantially reflecting one of the orthogonal polarization components while substantially transmitting the other orthogonal polarization component…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.