Enhanced Resolution Imaging By Aperiodically Perturbed Photonic Time Crystals

Manzoor, Zahra; Taravati, Sajjad

doi:10.1364/cleo_qels.2020.fth4q.7

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…Some of the recently proposed applications of STM metamaterials and metasurfaces include mixer-duplexerantennas [36], unidirectional beam splitters [11], nonreciprocal filters [37], [38], signal coding metasurfaces [15], [39], ST metasurfaces for advanced wave engineering and extraordinary control over electromagnetic waves [6], [8], [12]- [14], [17], [19], [40]- [48], nonreciprocal platforms [27], [29], [31], [48]- [52], frequency converters [12], [16], [22], [23], time-modulated antennas [53], [54] spectral camouflage metasurfaces [55], antenna-mixer-amplifiers [56], and enhanced resolution imaging photonic crystals [57]. This diverse and significant capability of STM media is due to their unique interactions with the incident field [27], [47], [58]- [61].…”

Section: Introductionmentioning

confidence: 99%

4D Wave Transformations Enabled by Space–Time Metasurfaces: Foundations and illustrative examples

Taravati

Eleftheriades

2023

IEEE Antennas Propag. Mag.

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Static metasurfaces have shown to be prominent compact structures for reciprocal and frequency-invariant transformation of electromagnetic waves in space. However, incorporating temporal variation to static metasurfaces enables dynamic apparatuses which are capable of four-dimensional tailoring of both the spatial and temporal characteristics of electromagnetic waves, leading to functionalities that are far beyond the capabilities of conventional static metasurfaces. This includes nonreciprocal full-duplex wave transmission, pure frequency conversion, parametric wave amplification, space-time (ST) decomposition, and space-time wave diffraction. This paper overviews our recent progress on analysis and functionalities of ST metasurfaces and slabs to break reciprocity. We study different operation regimes of ST metasurfaces such as scattering and diffraction at ST interfaces, ST sinusoidally-varying surfaces and slabs, as well as transmissive and reflective ST metasurfaces.

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Section: Introductionmentioning

confidence: 99%

4D Wave Transformations Enabled by Space–Time Metasurfaces: Foundations and illustrative examples

Taravati

Eleftheriades

2023

IEEE Antennas Propag. Mag.

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“…Such nonreciprocal metasurfaces can be modeled by bianisotropic constitutive parameters and introduce functionalities that are far beyond the capabilities of conventional static metasurfaces. This includes nonreciprocal full-duplex wave transmission, parametric wave amplification, pure frequency conversion, spatiotemporal decomposition, and space-time wave diffraction 21,[23][24][25][26][27][28][29][30] .…”

Section: Introductionmentioning

confidence: 99%

Programmable Nonreciprocal Meta-Prism

Taravati

Eleftheriadees

2021

Preprint

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Optical prisms are made of glass and map temporal frequencies into spatial frequencies by decomposing incident white light into its constituent colors and refract them into different directions. Conventional prisms suffer from their volumetric bulky and heavy structure and their material parameters are dictated by the Lorentz reciprocity theorem.. Considering various applications of prisms in wave engineering and their growing applications in the invisible spectrum and antenna applications, there is a demand for compact apparatuses that are capable of providing prism functionality in a reconfigurable manner, with a nonreciprocal/reciprocal response. Here, we propose a nonreciprocal metasurface-based prism constituted of an array of phase-and amplitude-gradient frequency-dependent spatially variant radiating super-cells. In conventional optical prisms, nonreciprocal devices and metamaterials, the spatial decomposition and nonreciprocity functions are fixed and noneditable. Here, we present a programmable metasurface integrated with amplifiers to realize controllable nonreciprocal spatial decomposition, where each frequency component of the incident polychromatic wave can be transmitted under an arbitrary and programmable angle of transmission with a desired transmission gain. Such a polychromatic metasurface prism is constituted of frequency-dependent spatially variant transistor-based phase shifters and amplifiers for the spatial decomposition of the wave components. Interesting features include three-dimensional prism functionality with programmable angles of refraction, power amplification, and directive and diverse radiation beams. Furthermore, the metasurface prism can be digitally controlled via a field-programmable gate array (FPGA), making the metasurface a suitable solution for radars, holography applications, and wireless telecommunication systems.

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“…In practice, the ST modulation is achieved through pumping the external energy into the medium [14], [15], [21], [29], [38]. Some of the recently proposed applications of STM metamaterials and metasurfaces include mixer-duplexerantenna [45], unidirectional beam splitters [14], nonreciprocal filters [46], [47], signal coding metasurfaces [18], [48], ST metasurfaces for advanced wave engineering and extraordinary control over electromagnetic waves [6], [11], [15]- [17], [21], [23], [24], [26], [49]- [56], nonreciprocal platforms [38], [40], [42], [56]- [60], frequency converters [15], [19], [22], [29], [30], time-modulated antennas [61]- [64] spectral camouflage metasurfaces [65], antenna-mixer-amplifiers [66], and enhanced resolution imaging photonic crystals [67]. This strong capability of STM media is due to their unique interactions with the incident field [38], [54], [68]- [71].…”

Section: Introductionmentioning

confidence: 99%

Four-Dimensional Wave Transformations By Space-Time Metasurfaces

Taravati,

Eleftheriades

2020

Preprint

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Static metasurfaces have shown to be prominent compact structures for reciprocal and frequency-invariant transformation of electromagnetic waves in space. However, incorporating temporal variation to static metasurfaces would result in dynamic apparatuses which are capable of four-dimensional tailoring of both the spatial and temporal characteristics of electromagnetic waves, leading to functionalities that are far beyond the capabilities of conventional static metasurfaces. This includes nonreciprocal full-duplex wave transmission, pure frequency conversion, parametric wave amplification, spatiotemporal decomposition, and space-time wave diffraction. This paper reviews recent progress and opportunities offered by space-time metasurfaces to break reciprocity, revealing their potential for low-energy, compact, integrated non-reciprocal devices and subsystems, and discusses the future of this exciting research front.

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Enhanced Resolution Imaging By Aperiodically Perturbed Photonic Time Crystals

Abstract: This study presents enhanced resolution imaging systems formed by aperiodically perturbed temporal photonic crystals. Such crystals excite low loss high modes with wavenumbers above diffraction limit and ability to manipulate Floquet mode’s phase and amplitude.

Cited by 5 publications

References 7 publications

4D Wave Transformations Enabled by Space–Time Metasurfaces: Foundations and illustrative examples

4D Wave Transformations Enabled by Space–Time Metasurfaces: Foundations and illustrative examples

Programmable Nonreciprocal Meta-Prism

Four-Dimensional Wave Transformations By Space-Time Metasurfaces

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