Ultra-compact and polarization-insensitive silicon waveguide 3 × 3 star-crossing based on composite subwavelength grating metamaterials.
Opt Lett
; 49(15): 4326-4329, 2024 Aug 01.
Article
em En
| MEDLINE
| ID: mdl-39090927
ABSTRACT
We present what we believe is the first report on a polarization-insensitive 3 × 3 silicon star-crossing utilizing a composite subwavelength metamaterial waveguide structure. Two different types of subwavelength grating metamaterials (nanohole grating and fan-shaped bent subwavelength grating) are respectively used to address diffraction issues in the crossing region and mode interference issues caused by a compact non-adiabatic design. This approach results in a device with an ultra-compact footprint of 12.68 × 10.98â
µm2 on a standard 220â
nm silicon-on-insulator (SOI) platform. Simulation results show low insertion loss (IL) values of <0.2â
dB/0.3â
dB and suppressed cross talk (CT) levels of <-27.2â
dB/-23.6â
dB for TE/TM polarizations across a wavelength range of 100â
nm (1500-1600â
nm). Experimental measurements of the fabricated devices confirm outstanding performance, with IL values of <0.35â
dB/0.4â
dB and CT levels of <-31.5â
dB/-28.6â
dB for TE/TM polarization in the C-band.
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Base de dados:
MEDLINE
Idioma:
En
Revista:
Opt Lett
Ano de publicação:
2024
Tipo de documento:
Article