Anisotropic leaky-like perturbation with subwavelength gratings enables zero crosstalk

Md Faiyaz Kabir; Md Borhan Mia; Ishtiaque Ahmed; Nafiz Jaidye; Syed Z. Ahmed; Sangsik Kim

doi:10.1038/s41377-023-01184-5

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Anisotropic leaky-like perturbation with subwavelength gratings enables zero crosstalk

Original Articles

- Anisotropic leaky-like perturbation with subwavelength gratings enables zero crosstalk
- Light: Science & Applications Vol. 12, Issue 6, Pages: 1153-1161(2023)
- Affiliations：
  
  1.Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA
  2.Department of Physics and Astronomy, Texas Tech University, Lubbock, TX 79409, USA
  3.School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, South Korea
- Author bio：
  
  Sangsik Kim (sangsik.kim@kaist.ac.kr)
- Funds：
- DOI：10.1038/s41377-023-01184-5
  CLC：
- Published：30 June 2023，
  
  Published Online：2 June 2023，
  
  Received：11 January 2023，
  
  Revised：27 April 2023，
  
  Accepted：12 May 2023
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Kabir, M. F. et al. Anisotropic leaky-like perturbation with subwavelength gratings enables zero crosstalk. Light: Science & Applications, 12, 1153-1161 (2023).
DOI：

Kabir, M. F. et al. Anisotropic leaky-like perturbation with subwavelength gratings enables zero crosstalk. Light: Science & Applications, 12, 1153-1161 (2023). DOI： 10.1038/s41377-023-01184-5.

摘要

Abstract

Electromagnetic coupling via an evanescent field or radiative wave is a primary characteristic of light

allowing optical signal/power transfer in a photonic circuit but limiting integration density. A leaky mode

which combines both evanescent field and radiative wave

causes stronger coupling and is thus considered not ideal for dense integration. Here we show that a leaky oscillation with anisotropic perturbation rather can achieve completely zero crosstalk realized by subwavelength grating (SWG) metamaterials. The oscillating fields in the SWGs enable coupling coefficients in each direction to counteract each other

resulting in completely zero crosstalk. We experimentally demonstrate such an extraordinarily low coupling between closely spaced identical leaky SWG waveguides

suppressing the crosstalk by ≈40 dB compared to conventional strip waveguides

corresponding to ≈100 times longer coupling length. This leaky-SWG suppresses the crosstalk of transverse–magnetic (TM) mode

which is challenging due to its low confinement

and marks a novel approach in electromagnetic coupling applicable to other spectral regimes and generic devices.

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