US 12,436,336 B2
Optical scanning element
Jungo Kondo, Miyoshi (JP); Kentaro Tani, Nagoya (JP); Keiichiro Asai, Nagoya (JP); and Tomoyoshi Tai, Inazawa (JP)
Assigned to NGK INSULATORS, LTD., Nagoya (JP)
Filed by NGK Insulators, Ltd., Nagoya (JP)
Filed on Nov. 30, 2022, as Appl. No. 18/060,032.
Application 18/060,032 is a continuation of application No. PCT/JP2021/025816, filed on Jul. 8, 2021.
Claims priority of application No. 2020-123752 (JP), filed on Jul. 20, 2020.
Prior Publication US 2023/0103702 A1, Apr. 6, 2023
Int. Cl. G02B 5/18 (2006.01); G02B 6/122 (2006.01); G02B 6/34 (2006.01); G02F 1/03 (2006.01); G02F 1/295 (2006.01); G02B 6/12 (2006.01); G02B 6/293 (2006.01); G02B 6/32 (2006.01)
CPC G02B 6/1225 (2013.01) [G02B 5/18 (2013.01); G02B 6/34 (2013.01); G02F 1/295 (2013.01); G02B 2006/1204 (2013.01); G02B 2006/12042 (2013.01); G02B 2006/12045 (2013.01); G02B 2006/12107 (2013.01); G02B 2006/1213 (2013.01); G02B 6/293 (2013.01); G02B 6/32 (2013.01); G02B 2207/101 (2013.01); G02F 1/03 (2013.01); G02F 2201/305 (2013.01); G02F 2202/20 (2013.01); G02F 2202/32 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An optical scanning element, comprising:
a photonic crystal layer having holes periodically formed in an electro-optical crystal substrate;
a line-defect optical waveguide formed in the photonic crystal layer;
a diffraction grating arranged in at least one portion selected from an upper portion, a left side surface portion, and a right side surface portion of the line-defect optical waveguide; and
electrodes arranged on a left side and a right side of the line-defect optical waveguide,
wherein the optical scanning element is configured so that an emission angle of light emitted from an upper surface of the line-defect optical waveguide is changed,
wherein the electro-optical crystal substrate includes one selected from the group consisting of: lithium niobate; lithium tantalate; potassium titanate phosphate;
potassium lithium niobate; potassium niobate; potassium tantalate niobate; and a solid solution of lithium niobate and lithium tantalate.