| Autor: |
Hansen SE, Arregui G, Babar AN, Albrechtsen M, Vosoughi Lahijani B, Christiansen RE, Stobbe S |
| Jazyk: |
angličtina |
| Zdroj: |
Optics express [Opt Express] 2023 May 22; Vol. 31 (11), pp. 17424-17436. |
| DOI: |
10.1364/OE.485356 |
| Abstrakt: |
We design and fabricate a grating coupler for interfacing suspended silicon photonic membranes with free-space optics while being compatible with single-step lithography and etching in 220 nm silicon device layers. The grating coupler design simultaneously and explicitly targets both high transmission into a silicon waveguide and low reflection back into the waveguide by means of a combination of a two-dimensional shape-optimization step followed by a three-dimensional parameterized extrusion. The designed coupler has a transmission of -6.6 dB (21.8 %), a 3 dB bandwidth of 75 nm, and a reflection of -27 dB (0.2 %). We experimentally validate the design by fabricating and optically characterizing a set of devices that allow the subtraction of all other sources of transmission losses as well as the inference of back-reflections from Fabry-Pérot fringes, and we measure a transmission of 19 % ± 2 %, a bandwidth of 65 nm and a reflection of 1.0 % ± 0.8 %. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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