Circular-polarization-selective transmission induced by spin-orbit coupling in a helical tape waveguide

Yahong Liu, Qinghua Guo, Hongchao Liu, Congcong Liu, Kun Song, Biao Yang, Quanwen Hou, Xiaopeng Zhao, Shuang Zhang, Miguel Navarro-Cia

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Spin-orbit coupling of light, describing the interaction between the polarization (spin) and spatial degrees of freedom (orbit) of light, plays an important role in subwavelength scale systems and leads to many interesting phenomena, such as the spin Hall effect of light. Here, based on the spin-orbit coupling, we design and fabricate a helical tape waveguide (HTW), which can realize a circular-polarization-selective process. When the incident circularly polarized wave is of the same handedness as the helix of the HTW, a nearly complete transmission is observed; in contrast, a counterrotating circular polarization of incident wave results in a much lower transmission or is even totally blocked by the HTW. Indeed, both simulations and experiments reveal that the blocked component of power leaks through the helical aperture of the HTW and forms a conical beam analogous to helical Cherenkov radiation due to the conversion from the spin
angular momentum to the orbital angular momentum. Our HTW structure demonstrates its potential as a polarization selector in a broadband frequency range.
Original languageEnglish
Article number054033
JournalPhysical Review Applied
Issue number5
Publication statusPublished - 22 May 2018


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