Authors: | M. Yang, Y. Yan, Z. Wu, G. Morthier, M. Zhao | Title: | High performance grating couplers on 220nm thick silicon by inverse design for perfectly vertical coupling | Format: | International Journal | Publication date: | 7/2023 | Journal/Conference/Book: | Scientific Reports
| Editor/Publisher: | Nature, | Volume(Issue): | 13 p.18112 | DOI: | 10.1038/s41598-023-45168-2 | Citations: | 8 (Dimensions.ai - last update: 8/12/2024) Look up on Google Scholar
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Abstract
Efficient grating couplers (GCs) for perfectly vertical coupling are difficult to realize due to the second-order back reflection. In this study, apodized GCs (AGCs) are presented for achieving perfectly-vertical coupling to 220 nm thick silicon-on-insulator (SOI) waveguides in the C-band. We compare the performance of the AGCs to that of uniform GCs (UGCs) and demonstrate the superiority of the former. The AGCs were obtained through inverse design using gradient-based optimization and were found to effectively suppress back reflection and exhibit better matching to the Gaussian beam profile. The design and measurement results show that AGCs have a 3 dB lower coupling loss than UGCs. We fabricated focusing AGCs by electron beam lithography with a single, 70 nm shallow etch and a minimum feature size of 100 nm, which makes them compatible with CMOS technology. The AGCs achieved a coupling efficiency of −5.86 dB for perfectly vertical coupling. Overall, our results demonstrate the potential of AGCs for achieving high-performance coupling in the C-band on the SOI platform. Related Research Topics
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