Non-reciprocity using quadrature-phase time-varying slab resonators

Chegnizadeh, Mahdi; Memarian, Mohammad; Mehrany, Khashayar

doi:10.1364/josab.37.000088

Cited by 18 publications

(7 citation statements)

References 27 publications

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“…In addition, a large number of versatile and high efficiency electromagnetic systems have been recently reported based on the unique properties of space-time modulation, including space-time metasurfaces for advanced wave engineering and extraordinary control over electromagnetic waves [11? -25], nonreciprocal platforms [26][27][28][29][30][31], frequency converters [19,32], and time-modulated antennas [33,34]. Such strong capabilities of space-time-modulated media is due to their unique interactions with the incident field [22,27,[35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Pure and Linear Frequency Converter Temporal Metasurface

Taravati

Eleftheriades

2021

Preprint

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Metasurfaces are ultrathin structures which are constituted by an array of subwavelength scatterers with designable scattering responses. They have opened up unprecedented exciting opportunities for extraordinary wave engineering processes. On the other hand, frequency converters have drawn wide attention due to their vital applications in telecommunication systems, health care devices, radio astronomy, military radars and biological sensing systems. Here, we show that a spurious-free and linear frequency converter metasurface can be realized by leveraging unique properties of engineered transmissive temporal supercells. Such a metasurface is formed by time-modulated supercells; themselves are composed of temporal and static patch resonators and phase shifters. This represents the first frequency converter metasurface possessing large frequency conversion ratio with controllable frequency bands and transmission magnitude. In contrast to conventional nonlinear mixers, the proposed temporal frequency converter offers a linear response. In addition, by taking advantage of the proposed surface-interconnector-phaser-surface (SIPS) architecture, a spurious-free and linear frequency conversion is achievable, where all undesired mixing products are strongly suppressed. The proposed metasurface may be digitally controlled and programmed through a field programmable gate array. This makes the spurious-free and linear frequency converter metasurface a prominent solution for wireless and satellite telecommunication systems, as well as invisibility cloaks and radars. This study opens a way to realize more complicated and enhanced-efficiency spectrum-changing metasurface.

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Section: Introductionmentioning

confidence: 99%

Pure and Linear Frequency Converter Temporal Metasurface

Taravati

Eleftheriades

2021

Preprint

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Pure and Linear Frequency Converter Temporal Metasurface

Taravati,

Eleftheriades

2021

Preprint

View full text Add to dashboard Cite

Metasurfaces are ultrathin structures which are constituted by an array of subwavelength scatterers with designable scattering responses. They have opened up unprecedented exciting opportunities for extraordinary wave engineering processes. On the other hand, frequency converters have drawn wide attention due to their vital applications in telecommunication systems, health care devices, radio astronomy, military radars and biological sensing systems. Here, we show that a spuriousfree and linear frequency converter metasurface can be realized by leveraging unique properties of engineered transmissive temporal supercells. Such a metasurface is formed by time-modulated supercells; themselves are composed of temporal and static patch resonators and phase shifters. This represents the first frequency converter metasurface possessing large frequency conversion ratio with controllable frequency bands and transmission magnitude. In contrast to conventional nonlinear mixers, the proposed temporal frequency converter offers a linear response. In addition, by taking advantage of the proposed surface-interconnector-phaser-surface (SIPS) architecture, a spurious-free and linear frequency conversion is achievable, where all undesired mixing products are strongly suppressed. The proposed metasurface may be digitally controlled and programmed through a field programmable gate array. This makes the spurious-free and linear frequency converter metasurface a prominent solution for wireless and satellite telecommunication systems, as well as invisibility cloaks and radars. This study opens a way to realize more complicated and enhanced-efficiency spectrum-changing metasurface.

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“…But in the time-gradient metasurface, despite the lack of conservation of the energy and the vertical component of the momentum, due to the conservation of the tangential components of the momentum, the nonreciprocity is not provided (Wu and Grbic 2020; ). So far, some ideas have been given for this subject so that by changing the phase, it is possible to move from purely time-modulated metasurfaces to nonreciprocal applications (Chegnizadeh et al 2020;Sedeh et al 2020). On the other hand, asymmetric structures are widely proposed in many optical applications (Ba et al 2019;Tang et al 2016; Ling et al 2017).…”

Section: Introductionmentioning

confidence: 99%

From Asymmetrical to the Nonreciprocal Isolator Using Time-varying Metasurfaces

Khorrami

Fathi

Khavasi

et al. 2021

Preprint

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We present an emulation design method for converting asymmetric isolators to nonreciprocal ones using 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 previously asymmetric designed structure.

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Non-reciprocity using quadrature-phase time-varying slab resonators

Cited by 18 publications

References 27 publications

Pure and Linear Frequency Converter Temporal Metasurface

Pure and Linear Frequency Converter Temporal Metasurface

Pure and Linear Frequency Converter Temporal Metasurface

From Asymmetrical to the Nonreciprocal Isolator Using Time-varying Metasurfaces

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