US 12,123,827 B2
Plasmonic structure, light source, and wavelength selective absorber
Jie Li, Saitama (JP); and Shunya Fukui, Saitama (JP)
Assigned to TAMRON CO., LTD., Saitama (JP)
Filed by TAMRON CO., LTD., Saitama (JP)
Filed on Oct. 14, 2021, as Appl. No. 17/501,600.
Claims priority of application No. 2020-219597 (JP), filed on Dec. 28, 2020.
Prior Publication US 2022/0205903 A1, Jun. 30, 2022
Int. Cl. G01N 21/33 (2006.01); G01J 3/02 (2006.01); G01J 3/42 (2006.01)
CPC G01N 21/33 (2013.01) [G01J 3/0205 (2013.01); G01J 3/42 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A plasmonic structure comprising:
a first conductor layer that covers a specified surface;
a dielectric layer; and
a second conductor layer that includes a plurality of conductor patterns that is two-dimensionally and periodically arranged, each of the plurality of conductor patterns having a circular shape or a regular polygonal shape, the first conductor layer, the dielectric layer, and the second conductor layer being stacked in this order, wherein
a diameter D of a circle circumscribed on each of the plurality of conductor patterns satisfies a following condition:
200 nm≤D≤800 nm,
a thickness g of the dielectric layer and the diameter D satisfy a following condition:
0.3≤g/D≤0.6, and
a wavelength band in which absorptivity is greater than or equal to 90% is a wavelength band continuous for 0.5 times or more a value of a center wavelength thereof.