Spin-orbit optical phenomena pertain to the wider class of electromagnetic effects originating from the interaction of the photon spin with the spatial structure and propagation characteristics of an optical wave, mediated by suitable optical media. There are many emerging photonic applications of spin-orbit interactions (SOI) of light, such as control of the optical wave propagation via the spin, enhanced optical manipulation, and generation of structured optical fields. Unfortunately, current applications are based on symmetric SOI, that is, the behaviours of polarized photons with two opposite spins are opposite, leading to the limit of spin-based multiplexers. The symmetry of SOI can be broken in our proposed metasurfaces, consisting of spatially varying birefringence, which can arbitrarily and independently build SOI for two opposite spins without reduction of optical energy usage. We obtain three kinds of dual-functional metasurfaces at visible and infrared wavelengths with high efficiency. Our concept of generation of asymmetric SOI for two spins, using anisotropic metasurfaces, will open new degrees of freedoms for building new types of spin-controlled multifunctional shared-aperture devices for the generation of complex structured optical fields.
Symmetry breaking of photonic spin-orbit interactions in metasurfaces
First published at:Mar 15, 2017
Opto-Electronic Engineering Vol. 44, Issue 03, pp. 319 - 325 (2017) DOI:10.3969/j.issn.1003-501X.2017.03.006
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Get Citation: Zhang Fei, Pu Mingbo, Luo Jun, et al. Symmetry breaking of photonic spin-orbit interactions in metasurfaces[J]. Opto-Electronic Engineering, 2017, 44(3): 319–325.
ACS nano, 2017