Complex-amplitude modulation of surface waves based on a metasurface coupler
Version 2 2023-03-01, 03:14
Version 1 2023-03-01, 03:14
Posted on 2023-03-01 - 03:14
Simultaneous and independent modulation of the amplitude and phase of surface waves (SWs) is critical in photonics and plasmonics. Here, we propose a method for flexible complex-amplitude modulation of SWs based on a metasurface coupler. Benefiting from the full range complex-amplitude modulation ability of the meta-atoms over the transmitted field, the coupler can convert the incident wave into a driven surface wave (DSW) with an arbitrary combination of amplitude and initial phase. By placing a dielectric waveguide that supports guided SWs below the coupler, the DSWs can resonantly couple to SWs while preserving complex-amplitude modulation. The proposed scheme provides a practical way for freely tailoring the phase and amplitude profiles of SWs wavefronts. As verification, meta-devices for normal and deflected SW Airy beam generation and SW dual focusing are designed and characterized in the microwave regime. Our findings may stimulate various advanced surface optical meta-devices.
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Zhang, Zhihui; Wu, Chao; li, quan; Zhao, Song; Li, Hongqiang (2023). Complex-amplitude modulation of surface waves based on a metasurface coupler. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.6437690.v2
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AUTHORS (5)
ZZ
Zhihui Zhang
CW
Chao Wu
ql
quan li
SZ
Song Zhao
HL
Hongqiang Li