US 11,940,560 B2
Ultra-long subwavelength grating based optical antenna for optical phased array
Xiaochuan Xu, Shenzhen (CN); Jiaxin Chen, Shenzhen (CN); Wanxin Li, Shenzhen (CN); and Yong Yao, Shenzhen (CN)
Assigned to Harbin Institute of Technology, Shenzhen, Shenzhen (CN)
Filed by Harbin Institute of Technology, Shenzhen, Shenzhen (CN)
Filed on Feb. 4, 2021, as Appl. No. 17/168,089.
Claims priority of application No. 202010736857.5 (CN), filed on Jul. 28, 2020.
Prior Publication US 2022/0037780 A1, Feb. 3, 2022
Int. Cl. H01Q 3/26 (2006.01); G01S 7/481 (2006.01); G02B 6/124 (2006.01); G02F 1/295 (2006.01)
CPC G01S 7/4814 (2013.01) [G02B 6/124 (2013.01); G02F 1/2955 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An ultra-long subwavelength grating as the optical antenna for optical phased arrays, comprising a top structure and a bottom structure which are vertically stacked,
wherein a refractive index of the bottom structure is lower than a refractive index of the top structure,
wherein a strip waveguide is formed in a middle of the top structure, and subwavelength blocks are disposed in the top structure with a gap between edges of the strip waveguide and edges of the subwavelength blocks and with periodicity on two sides of the strip waveguide and the periodicity of the subwavelength blocks are arrayed in a direction along the strip waveguide to form the grating structure.