Surface Plasmon Polaritons in Time-Modulated Metallic Materials for Non-Reciprocal Controllable Leaky-Wave Antennas

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 permit...

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Bibliographic Details
Published in:IEEE access 2022, Vol.10, p.28461-28470
Main Authors: Dinh, Minh Quang, Thuy Le, Minh
Format: Article
Language:English
Subjects:
Antennas
Continuous radiation
Coupling
Couplings
Differential equations
Dispersion
Finite difference time domain method
Finite-difference time-domain
Frequency modulation
Incident waves
Leaky waves
Mathematical models
Metallic materials
Modulation
non-reciprocity
Optical communication
Optical components
Optical pumping
Polaritons
Radiation
Reciprocity
surface plasmon polariton
Time-domain analysis
time-modulation
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Summary: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.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2022.3157869