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US 11,269,137 B2Granted
Wavelength selective filtering with non-radial array of microstructure elements
AssigneeLawrence Livermore National Security, LLC
InventorsLeily S. Kiani, Jay W. Dawson, Derrek R. Drachenberg, Michael J. Messerly, Paul H. Pax
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Abstract
A non-radial array of microstructure elements provides enhanced wavelength selective filtering. The elements are arranged along a line that does not intersect the center of the core. In this configuration, the first coupling element in an array that is nearest to the core is a non-integer array unit spacing from the main waveguide where the array unit spacing is defined as the flat to flat distance of a hexagonal cell.
Claims20
An apparatus comprising:
- a core;
- a lattice of background material surrounding said core and including a subset of background material in direct contact with said core, wherein said subset comprises an inner boundary and an outer boundary, wherein said inner boundary is in contact with and is closer to said core than said outer boundary, wherein the distance from the center of said core to said outer boundary varies from a maximum value to a minimum value depending upon the direction of said distance from said core, wherein said minimum value is located in a valley between maximum values;
- and
- a first outcoupling element located in said valley.
1 more element
An apparatus, comprising:
- a core,
- a lattice of hexagonal elements surrounding said core, wherein the innermost hexagonal elements of said lattice are in contact with said core;
- at least one outcoupling branch configured to evanescently couple to said core, wherein said at least one outcoupling branch is configured in a line that does not intersect the center of said core.
An apparatus, comprising:
- a core;
- a lattice of background elements around said core, wherein said lattice includes a subset of elements around, in contact with and immediately adjacent to said core, wherein said subset of elements comprises a series of large elements alternating with smaller elements, wherein a first line drawn from the center of said core to the outer boundary away from said core of each of said large elements is longer than a second line drawn from the center of said core and that bisects said smaller element to its outer boundary away from said core;
- and
- a first branch element having a center located on a line colinear with said second line.
1 more element
Dependencies are inferred from the claim text.