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From asymmetrical transmitter to the nonreciprocal isolator using time-varying metasurfaces

Optical and Quantum Electronics volume 54, Article number: 268 (2022) Cite this article

Abstract

We present an emulation design method for converting asymmetrical transmitters to nonreciprocal isolators equipped with time-varying metasurfaces. To illustrate the model, we design a structure using a combination of the photonic crystal (PhC) and time-varying metasurface. Moreover, we propose a general approach for numerical analysis of the time-modulated proposed structure using the extension of the transfer matrix method (TMM) which consists of working through the device one layer at a time and calculating an overall transfer matrix including the time-variation of the permittivity and permeability in each layer. Also, we use an optimization algorithm that is less used in the field of electromagnetism but is suitable for fast and accurate parameter optimization. The results show that the proposed method, using pure time-varying metasurfaces which cannot prepare full nonreciprocity alone, is a promising procedure for breaking the Lorentz reciprocity in the general isolator system as well as maintaining the main core of previously asymmetric designed structure.

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All the relevant data associated with this work will be made available from the corresponding author upon reasonable request.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, Tarbiat Modares University (TMU), Tehran, Iran

    Yaser Khorrami & Davood Fathi

  2. Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran

    Amin Khavasi

  3. EM Lab, Department of Electrical and Computer Engineering, University of Texas at El Paso, El Paso, TX, 79968, USA

    Raymond C. Rumpf

Authors
  1. Yaser Khorrami
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  2. Davood Fathi
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  3. Amin Khavasi
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  4. Raymond C. Rumpf
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Correspondence to Davood Fathi.

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Khorrami, Y., Fathi, D., Khavasi, A. et al. From asymmetrical transmitter to the nonreciprocal isolator using time-varying metasurfaces. Opt Quant Electron 54, 268 (2022). https://doi.org/10.1007/s11082-022-03592-0

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  • DOI: https://doi.org/10.1007/s11082-022-03592-0

Keywords

  • Nonreciprocity
  • Asymmetric transmission
  • Isolator
  • Spacetime
  • Metasurface