Anti-reflection subwavelength gratings for InP-based waveguide facets

Lukas Puts (Corresponding author), Xaveer J.M. Leijtens, Pavel Cheben, Jens Schmid, Sander Reniers, Daniele Melati

Onderzoeksoutput: Bijdrage aan tijdschriftCommunicatieAcademicpeer review

1 Citaat (Scopus)
17 Downloads (Pure)


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 −30 dB 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 −25 dB, confirming the effectiveness of the technique.
Originele taal-2Engels
Pagina's (van-tot)3701-3704
Aantal pagina's4
TijdschriftOptics Letters
Nummer van het tijdschrift15
StatusGepubliceerd - 1 aug 2021


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