US 12,007,530 B2
Photonic crystal optical resonator and method for fabricating same
Kenta Takata, Tokyo (JP); Masaya Notomi, Tokyo (JP); Akihiko Shinya, Tokyo (JP); Eiichi Kuramochi, Tokyo (JP); Hideaki Taniyama, Tokyo (JP); and Shota Kita, Tokyo (JP)
Assigned to Nippon Telegraph and Telephone Corporation, Tokyo (JP)
Appl. No. 17/430,375
Filed by Nippon Telegraph and Telephone Corporation, Tokyo (JP)
PCT Filed Jan. 31, 2020, PCT No. PCT/JP2020/003700
§ 371(c)(1), (2) Date Aug. 12, 2021,
PCT Pub. No. WO2020/166387, PCT Pub. Date Aug. 20, 2020.
Claims priority of application No. 2019-024296 (JP), filed on Feb. 14, 2019.
Prior Publication US 2022/0066068 A1, Mar. 3, 2022
Int. Cl. G02B 1/00 (2006.01); G02B 6/122 (2006.01); H01S 5/10 (2021.01)
CPC G02B 1/005 (2013.01) [G02B 6/1225 (2013.01); H01S 5/10 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A photonic crystal optical resonator comprising:
a photonic crystal main body including a base part and a plurality of columnar lattice elements each having a different refractive index from that of the base part, the plurality of columnar lattice elements being provided on the base part spaced apart in a triangular lattice at intervals not more than a wavelength of targeted light; and
a light confinement portion comprising a point defect configured by a portion obtained by removing at least one of the plurality of columnar lattice elements on respective lattice points of the photonic crystal main body;
wherein each of six first lattice elements of the plurality of columnar lattice elements adjacent to the light confinement portion is configured to shift from first lattice points in a direction of separating from the light confinement portion;
wherein each of twelve second lattice elements of the plurality of columnar lattice elements adjacent to the six first lattice elements on a side of separating from the light confinement portion is configured to shift from second lattice points in the direction of separating from the light confinement portion;
wherein each of the six first lattice elements has a smaller diameter than others of the plurality of columnar lattice elements;
wherein optimization of an amount of shift of the six first lattice elements, optimization of an amount of shift of the twelve second lattice elements, and optimization of a diameter of the six first lattice elements such that a Q value of the photonic crystal optical resonator is maximized simultaneously; and
wherein the Q value of the photonic crystal optical resonator that is maximized exceeds 10 million.