Multilayer grid waveplate
AssigneeMoxtek, Inc.
InventorDaniel Bacon-Brown
Life of this patent
Estimating the term…
Abstract
The waveplates herein (A) can have high performance across a broad wavelength range and broad range of incident angles; (B) can be thin; and (C) can withstand a high temperature. The waveplates can include ribs 12 on a substrate 11 with a channel 13 between each pair of adjacent ribs 12. Each rib 12 can include the following layers in the following order moving outward from the substrate: a bottom-medium-layer BM (nBM), a high-layer H (nH), then a top-medium-layer TM (nTM). Each rib 12 can be located on a bottom-low-layer BL (nBL). A top-low-layer TL (nTL) can be located on a face TMF of the top-medium-layer TM farthest from the substrate 11. Relationships between indices of refraction of these layers can be nBL<nBM<nH and nTM<nTM<nH.
Claims20
A waveplate comprising:
- ribs on a substrate with channels between adjacent ribs;
- each rib located on a bottom-low-layer with a refractive index nBL and an extinction coefficients kBL;
- each rib comprises multiple layers, including a bottom-medium-layer with a refractive index nBM and an extinction coefficients kBM, a high-layer with a refractive index nH and an extinction coefficients kH, and a top-medium-layer with a refractive index nTM and an extinction coefficients kTM;
- each layer of each rib being separate from a corresponding layer in any adjacent rib;
- moving outward from the substrate, an order of the multiple layers in each rib is the bottom-medium-layer, the high-layer, then the top-medium-layer;
- a top-low-layer, with a refractive index nTL and an extinction coefficients kTL, on a face of the top-medium-layer farthest from the substrate;
- each refractive index and extinction coefficient is measured at 550 nm;
- kBL, kBM, kH, kTM, and kTL are all≤0.1;
- nBL<nBM<nH;
- and
- nTL<nTM<nH.
Dependencies are inferred from the claim text.