Wide-angle and broadband polarization converter
US7583439B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 9, 2007 |
| Grant date | Sep 1, 2009 |
| Priority date | — |
| Expiry date | Jan 2, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/283
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Apparatus and methods for a polarization converter comprising a polarization beam splitter for receiving an input light beam and allows a transverse magnetic to pass through the polarization beam splitter and reflects a transverse electric wave and a diffraction grating having a reflectivity and polarization convertible grating for receiving the transverse electric wave reflects back a reflected transverse electric wave having a polarization rotation. The broadband wide-angle polarization beam splitter can be alternative optical elements such as a prism or an optical device having multi-layered films. The diffraction grating can be a diffraction grating having alternating parallel protrusions and recesses, metallic diffraction grating, metal-coated diffraction grating, metal-coated multi-layered diffraction grating, non-metallic reflective material surface grating, volume grating, a multi-layer grating, diffractive grating having sub-wavelength grating periods or diffractive grating having multi-orders diffraction gratings. The diffraction grating can have alternative shapes such as binary, trapezoidal, sinusoidal, parabolic, triangular and Gaussian.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.