US 12,032,118 B2
Isotropic filters in spatial frequency domain by a photonic crystal slab
Cheng Guo, Stanford, CA (US); Meng Xiao, Wuhan (CN); Momchil Minkov, San Mateo, CA (US); Yu Shi, Redmond, WA (US); and Shanhui Fan, Stanford, CA (US)
Assigned to The Board of Trustees of the Leland Stanford Junior University, Stanford, CA (US)
Filed by The Board of Trustees of the Leland Stanford Junior University, Stanford, CA (US)
Filed on Feb. 22, 2021, as Appl. No. 17/181,318.
Application 17/181,318 is a continuation of application No. 16/190,820, filed on Nov. 14, 2018, granted, now 10,928,551.
Claims priority of provisional application 62/585,816, filed on Nov. 14, 2017.
Prior Publication US 2021/0278566 A1, Sep. 9, 2021
Int. Cl. G02B 1/00 (2006.01); G02B 5/20 (2006.01); G02B 5/28 (2006.01)
CPC G02B 1/005 (2013.01) [G02B 5/20 (2013.01); G02B 5/28 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method of making an isotropic imaging filter comprising a photonic crystal slab, comprising:
designing a photonic crystal slab having a periodic lattice of air through holes, wherein parameters of a photonic crystal slab design include a dielectric constant, a thickness, a through hole radius and a lattice constant,
wherein the periodic lattice of air holes are separated according to a value of the lattice constant,
wherein the thickness and the hole radius are configured such that the photonic crystal slab generates isotropic bands of guided resonances; and
making a photonic crystal slab according to the photonic crystal slab design.