Isotropic filters in spatial frequency domain by a photonic crystal slab
US10928551B2 · kind B2 · utility
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7Claims
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Key dates
| Filing date | Nov 14, 2018 |
| Grant date | Feb 23, 2021 |
| Priority date | — |
| Expiry date | May 3, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/46
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An isotropic imaging filter is provided that includes a photonic crystal slab, where the photonic crystal slab includes a square lattice of air through holes, a dielectric constant, a thickness (d), a through hole radius (r), and a lattice constant (a), where the square lattice of air holes are separated according to a value of the lattice constant, where the thickness is configured according to d=M(a), where the through hole radii is configured according to r=N(a), where the thickness and the hole radii are configured to generate isotropic bands of guided resonances of an incident image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.