期刊
IEEE ACCESS
卷 10, 期 -, 页码 28461-28470出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2022.3157869
关键词
Couplings; Frequency modulation; Modulation; Mathematical models; Metallic materials; Dispersion; Time-domain analysis; Finite-difference time-domain; leaky waves; non-reciprocity; surface plasmon polariton; time-modulation
资金
- Vingroup Joint Stock Company (Vingroup JSC), Vingroup
- Vingroup Innovation Foundation (VINIF) [VINIF.2020.DA09]
In this work, the authors propose using time-modulation in metallic materials as a coupling mechanism between radiation and surface plasmon polaritons (SPP) without the need for optical components. They demonstrate the coupling through simulations and show that it can be actively controlled via strength and frequency modulation.
In this work, we propose using time-modulation in metallic materials, which can be realized through either optical pumps or electric signals, as a coupling mechanism between radiation and surface plasmon polaritons (SPP) without using any optical component. By applying temporal changes in the permittivity of metallic materials, scattered waves yield different frequencies from incident waves, potentially satisfying the continuous wave vector condition and enabling SPP from radiation. The coupling is observed in finite-difference time-domain simulations, where the dispersive metallic materials are modeled using auxiliary differential equations. Under the same modulation, coupling from radiation to SPP and from SPP to radiation differ strongly, showing clear evidence of the non-reciprocity. In addition, the coupling is also actively controllable via strength and frequency modulation. We also demonstrate the coupling at multiple angles, which is difficult to achieve with common methods such as Kretschmann or Otto configurations. The direct and non-reciprocal coupling between radiation and SPP can be beneficial for the application of telecommunication to form transmitting-only and receiving-only leaky-wave antennas in full-duplex transceivers.
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