CPC G02B 6/124 (2013.01) [G02B 2006/12061 (2013.01); G02B 2006/12126 (2013.01)] | 20 Claims |
1. A structure comprising:
a waveguide absorber with a grating pattern, wherein the waveguide absorber comprises alternating wide regions and narrow regions, and the grating pattern is a gap between a pair of the wide regions and adjacent to the narrow region between the pair of the wide regions,
wherein the waveguide absorber is provided in a spiral configuration and the spiral configuration comprises concentrically placed rounded turns.
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