Evacuated periodic structures and methods of manufacturing
US12158612B2 · kind B2 · utility
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1,096References
18Claims
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Key dates
| Filing date | Mar 7, 2022 |
| Grant date | Dec 3, 2024 |
| Priority date | — |
| Expiry date | May 6, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2270/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Gratings may be used in waveguides. Deep surface relief gratings (SRGs) may offer many advantages over conventional SRGs, an important one being a higher S-diffraction efficiency. Deep SRGs can be implemented as polymer surface relief gratings or evacuated periodic structures (EPSs). EPSs can be formed by first recording a holographic polymer dispersed liquid crystal (HPDLC) periodic structure. Removing the liquid crystal from the cured periodic structure provides a polymer surface relief grating. Polymer surface relief gratings have many applications including for use in waveguide-based displays.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.