Anti-reflection subwavelength gratings for InP-based waveguide facets.
Opt Lett
; 46(15): 3701-3704, 2021 Aug 01.
Article
in En
| MEDLINE
| ID: mdl-34329260
ABSTRACT
We demonstrate the anti-reflection properties of lithographically defined subwavelength gratings applied to the facets of integrated waveguides realized in the InP membrane-on-silicon platform. The subwavelength gratings are based on the gradient index effect to create a smooth index transition between the core material and air, making it possible to obtain reflections below -30dB at a wavelength of 1550 nm for both TE and TM polarized modes, as shown by 3D finite-difference time-domain simulations. Characterizations performed using Mach-Zehnder interferometers as test structures show relative reflections as low as -25dB, confirming the effectiveness of the technique.
Full text:
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Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Opt Lett
Year:
2021
Document type:
Article