Exceptional coupling in photonic anisotropic metamaterials for extremely low waveguide crosstalk

Mia, Md Borhan; Ahmed, Syed Z.; Ahmed, Ishtiaque; Lee, Yun Jo; Qi, Minghao; Kim, Sangsik

doi:10.1364/OPTICA.394987

Title: Exceptional coupling in photonic anisotropic metamaterials for extremely low waveguide crosstalk

Journal Article · Tue Jul 28 00:00:00 EDT 2020 · Optica

DOI:https://doi.org/10.1364/OPTICA.394987· OSTI ID:1643201

; Ahmed, Syed Z.; Ahmed, Ishtiaque; Lee, Yun Jo; Qi, Minghao;

Electromagnetic coupling is ubiquitous in photonic systems and transfers optical signals from one device to the other, creating crosstalk between devices. While this allows the functionality of some photonic components such as couplers, it limits the integration density of photonic chips, and many approaches have been proposed to reduce the crosstalk. However, due to the wave nature of light, complete elimination of crosstalk between closely spaced, identical waveguides is believed to be impossible and has not been observed experimentally. Here we show an exceptional coupling that can completely suppresses the crosstalk utilizing highly anisotropic photonic metamaterials. The anisotropic dielectric perturbations in the metamaterial mutually cancel the couplings from different field components, resulting in an infinitely long coupling length. We demonstrate the extreme suppression of crosstalk via exceptional coupling on a silicon-on-insulator platform, which is compatible with a complementary metal-oxide-semiconductor process. The idea of exceptional coupling with anisotropic metamaterials can be applied to many other electromagnetic devices, and it could drastically increase the integration density of photonic chips.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NA-0003525

OSTI ID:: 1643201

Journal Information:: Optica, Journal Name: Optica Vol. 7 Journal Issue: 8; ISSN 2334-2536

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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