	US 12,265,256 B2
	Bricked sub-wavelength periodic waveguide, modal adapter, power divider and polarisation splitter that use said waveguide
Juan Gonzalo Wangüemert Pérez, Málaga (ES); Íñigo Molina Fernández, Málaga (ES); Alejandro Ortega Moñux, Málaga (ES); Robert Halir, Málaga (ES); and Jose Manuel Luque Gonzalez, Málaga (ES)
Assigned to UNIVERSIDAD DE MÁLAGA, Málaga (ES)
Appl. No. 17/922,350
Filed by UNIVERSIDAD DE MÁLAGA, Málaga (ES)
PCT Filed Apr. 27, 2021, PCT No. PCT/ES2021/070279 § 371(c)(1), (2) Date Oct. 28, 2022, PCT Pub. No. WO2021/219913, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. P202030367 (ES), filed on Apr. 29, 2020.
Prior Publication US 2023/0176266 A1, Jun. 8, 2023
Int. Cl. G02B 6/124 (2006.01); G02B 6/122 (2006.01); G02B 5/18 (2006.01); G02B 5/30 (2006.01); G02B 6/10 (2006.01); G02B 6/12 (2006.01); G02B 6/24 (2006.01)

CPC G02B 6/124 (2013.01) [G02B 6/1228 (2013.01); G02B 5/18 (2013.01); G02B 5/30 (2013.01); G02B 6/107 (2013.01); G02B 2006/1209 (2013.01); G02B 2006/1215 (2013.01); G02B 2006/12154 (2013.01); G02B 6/24 (2013.01); G02B 2207/117 (2013.01)]

18 Claims

1. A bricked sub-wavelength periodic waveguide through which a wave propagates in a propagation direction, the periodic waveguide comprising:

a substrate on which there is arranged a plurality of blocks of a core material arranged in a periodic manner with a period ‘Λ_z’ in the propagation direction, and a cover material, arranged between and on the plurality of blocks, there being first blocks of width ‘a_x’ and second blocks of width ‘b_x’, alternating on the substrate perpendicularly to the propagation direction according to a period ‘Λ_x’, and the second blocks being shifted a distance ‘d_z’ in the propagation direction with respect to the first blocks,

wherein the period ‘Λ_z’ fulfills:

Λ_z<λ/(2·n_eff)

λ being the wavelength of the wave that propagates through the periodic waveguide and n_effbeing an effective mode index.