Time-modulated Patch Antennas with Nonreciprocal Polarization Handedness

Bourkov, M. A.; Do, James; Liu, X.; Álvarez‐Melcón, A.; Gómez‐Díaz, J. S.

doi:10.1109/ieeeconf35879.2020.9330150

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…Alternatively, space–time metasurfaces can be exploited for realizing magnetless nonreciprocity through circumventing the symmetry constraints upon introducing the spatiotemporal modulation. In fact, by introducing the space–time phase discontinuities to the interface of metasurfaces, they are no longer bounded by Lorentz reciprocity 51 , 61 , 62 . In Ref.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, by introducing the space-time phase discontinuities to the interface of metasurfaces, they are no longer bounded by Lorentz reciprocity. 51,61,62 In Ref. 61, the concept of nonreciprocal wavefront engineering is experimentally demonstrated at microwaves, in which the nonreciprocity arises due to imposing drastically different phase gradients during the up/downconversion.…”

Section: Introductionmentioning

confidence: 99%

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High-quality-factor space–time metasurface for free-space power isolation at near-infrared regime

Sabri,

Mosallaei

2023

Adv. Photon. Nexus

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.Space–time metasurfaces are promising candidates for breaking Lorentz reciprocity, which constrains light propagation in numerous practical applications. There is a substantial difference between carrier and modulation frequencies in space–time photonic metasurfaces that leads to negligible spatial pathway variation of light and weak nonreciprocal response. To surmount this obstacle, herein, the design principle of a high-quality-factor space–time gradient metasurface is demonstrated at the near-infrared regime that increases the lifetime of photons and allows for strong power isolation by lifting the adiabaticity of modulation. The all-dielectric metasurface consists of an array of silicon subwavelength gratings (SWGs) that are separated from distributed Bragg reflectors by a silica buffer. The resonant mode with ultrahigh quality-factor exceeding 104 is excited within the SWG, which is characterized as magnetic octupole and features strong field localization. The SWGs are configured as multijunction p–n layers, whose multigate biasing with time-varying waveforms enables modulation of carriers in space and time. The proposed nonreciprocal metasurface is exploited for free-space optical power isolation by virtue of modulation-induced phase shift. It is shown that under time reversal and by interchanging the directions of incident and observation ports, power isolation of ≈35 dB can be maintained between the two ports in free space.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-quality-factor space–time metasurface for free-space power isolation at near-infrared regime

Sabri,

Mosallaei

2023

Adv. Photon. Nexus

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“…1. A very preliminary theoretical study on this subject by the authors appeared in a recent conference [46]. The antenna relies on time-modulating orthogonal surface currents induced in a patch using low frequency signals with controllable phases.…”

Section: Introductionmentioning

confidence: 99%

Time-modulated Patch Antennas with Tunable and Nonreciprocal Polarization Ellipticity

Do¹,

Zang²,

Melcón³

et al. 2022

Preprint

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In this paper, we propose and demonstrate time-modulated patch antennas able to exhibit opposite polarization ellipticity when operated in transmission or reception, effectively leading to nonreciprocal polarization responses. To this purpose, we merge a patch antenna fed from four symmetrical sides with a low-frequency time-modulation scheme. This configuration exploits the photonic Aharonov Bohm effect to individually manipulate the phase of surface currents flowing along orthogonal directions on the antenna with the phase of the modulation signals. Experimental results at 2.2 GHz demonstrate high conversion efficiency in the time-modulation process (loss 3 dB), isolation levels over 40 dB in transmission/reception mode, and tunability to generate/receive electromagnetic waves with arbitrary polarization ellipticity. Our findings may enable exciting applications in full-duplex communications as well as in polarimetric radar, sensing and imaging systems.

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Time-Modulated Patch Antennas With Tunable and Nonreciprocal Polarization Response

Zang

Álvarez‐Melcón

et al. 2022

IEEE Access

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Time-modulated Patch Antennas with Nonreciprocal Polarization Handedness

Cited by 4 publications

References 7 publications

High-quality-factor space–time metasurface for free-space power isolation at near-infrared regime

High-quality-factor space–time metasurface for free-space power isolation at near-infrared regime

Time-modulated Patch Antennas with Tunable and Nonreciprocal Polarization Ellipticity

Time-Modulated Patch Antennas With Tunable and Nonreciprocal Polarization Response

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