Anisotropic leaky-like perturbation with subwavelength gratings enables zero crosstalk

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

doi:10.1038/s41377-023-01184-5

Title: Anisotropic leaky-like perturbation with subwavelength gratings enables zero crosstalk

Abstract

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.

Authors:

Kabir, Md Faiyaz;

; Ahmed, Ishtiaque; Jaidye, Nafiz; Ahmed, Syed Z.;

Publication Date:: Fri Jun 02 00:00:00 EDT 2023

Sponsoring Org.:: USDOE

OSTI Identifier:: 1983421

Grant/Contract Number:: NA-0003525

Resource Type:: Published Article

Journal Name:: Light, Science & Applications

Additional Journal Information:: Journal Name: Light, Science & Applications Journal Volume: 12 Journal Issue: 1; Journal ID: ISSN 2047-7538

Publisher:: Nature Publishing Group

Country of Publication:: United Kingdom

Language:: English

Citation Formats


                    Kabir, Md Faiyaz, Mia, Md Borhan, Ahmed, Ishtiaque, Jaidye, Nafiz, Ahmed, Syed Z., and Kim, Sangsik. Anisotropic leaky-like perturbation with subwavelength gratings enables zero crosstalk.  United Kingdom: N. p., 2023. 
Web.  doi:10.1038/s41377-023-01184-5.

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                    Kabir, Md Faiyaz, Mia, Md Borhan, Ahmed, Ishtiaque, Jaidye, Nafiz, Ahmed, Syed Z., & Kim, Sangsik. Anisotropic leaky-like perturbation with subwavelength gratings enables zero crosstalk.  United Kingdom.  https://doi.org/10.1038/s41377-023-01184-5

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                    Kabir, Md Faiyaz, Mia, Md Borhan, Ahmed, Ishtiaque, Jaidye, Nafiz, Ahmed, Syed Z., and Kim, Sangsik. Fri .  
"Anisotropic leaky-like perturbation with subwavelength gratings enables zero crosstalk".  United Kingdom.  https://doi.org/10.1038/s41377-023-01184-5.

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@article{osti_1983421,

  title        = {Anisotropic leaky-like perturbation with subwavelength gratings enables zero crosstalk},

  author       = {Kabir, Md Faiyaz and Mia, Md Borhan and Ahmed, Ishtiaque and Jaidye, Nafiz and Ahmed, Syed Z. and Kim, Sangsik},

  abstractNote = {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.},

  doi          = {10.1038/s41377-023-01184-5},

  journal      = {Light, Science & Applications},

  number       = 1,

  volume       = 12,

  place        = {United Kingdom},

  year         = {Fri Jun 02 00:00:00 EDT 2023},

  month        = {Fri Jun 02 00:00:00 EDT 2023}

}

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Title: Anisotropic leaky-like perturbation with subwavelength gratings enables zero crosstalk

Abstract

Citation Formats

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