Journal
NANOSCALE
Volume 11, Issue 12, Pages 5746-5753Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr00675c
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Funding
- National Key Research and Development Program of China [2017YFA0700202]
- National Natural Science Foundation of China [61675147, 61605141, 61735010]
- National Natural Science Foundation of China Major Research Program Integration Project [91838301]
- Basic Research Program of Shenzhen [JCYJ20170412154447469]
- Wenzhou City Governmental Public Industrial Technology Project [G20160014]
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Pancharatnam-Berry (P-B) metasurfaces introduce geometric phases to circularly polarized electromagnetic waves through geometric rotation of the unit cells, thereby converting spin angular momentum (SAM) to orbital angular momentum (OAM) of photons and achieving flexible modulation of spin-polarized waves. It is highly desirable for dynamically tunable P-B metasurfaces to be actively applied. Here, combining double split-ring resonators (DSRRs) with photosensitive semiconductor germanium (Ge), we propose three types of all-optical active Pancharatnam-Berry coding metasurface for dynamic amplitude modulation of spin waves and vortex beams in the terahertz band. Coupled with signal processing methods such as the convolution operation, optical active P-B coding metasurfaces show a strong regulation effect on terahertz beams. This opens up a broad path for coding metasurface applications such as high-speed wireless terahertz communications.
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