Methods and apparatus for broadband angular selectivity of electromagnetic waves
US10073191B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2015 |
| Grant date | Sep 11, 2018 |
| Priority date | — |
| Expiry date | Oct 7, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/0147
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A filter to transmit incident radiation at a predetermined incidence angle includes a plurality of photonic crystal structures disposed substantially along a surface normal direction of the filter. The photonic crystal structure includes a multilayer cell that comprises a first layer having a first dielectric permittivity, and a second layer having a second dielectric permittivity different from the first dielectric permittivity. The first layer and the second layer define a Brewster angle substantially equal to the predetermined incidence angle based on the first dielectric permittivity and the second permittivity. Each photonic crystal structure in the plurality of photonic crystal structures defines a respective bandgap, and the respective bandgaps of the plurality of photonic crystal structures, taken together, cover a continuous spectral region of about 50 nm to about 100 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.