Light transmission through a circular metallic grating under broadband radial and azimuthal polarization illumination |
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| Authors: | Lerman Gilad M Grajower Meir Yanai Avner Levy Uriel |
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| Affiliation: | Department of Applied Physics, The Benin School of Engineering and Computer Science, The Hebrew University of Jerusalem, Jerusalem, Israel. gilad.lerman@mail.huji.ac.il |
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| Abstract: | We studied the characteristics of a circular metallic grating illuminated by broadband radial and azimuthal polarizations. We demonstrated that this scenario is the cylindrical analogue of a one-dimensional Cartesian grating illuminated by TM and TE polarizations. We measured the transmission spectra of this structure and observed strong polarization selectivity and, specifically, a resonance for radial polarization excitation, indicating a strong coupling to surface plasmons. The structure may be attractive for applications where pure radial polarization is needed, such as tight focusing, material processing, and particle trapping. |
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