| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Polarization-Selective Collimation Effect with a Reflective Plasmonic Cavity |
| MAO Fei-Long, XIE Jin-Jin, FAN Qing-Yan, ZHANG Li-Jian, AN Zheng-Hua** |
| Institute of Advanced Materials, State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433 |
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| Cite this article: |
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MAO Fei-Long, XIE Jin-Jin, FAN Qing-Yan et al 2012 Chin. Phys. Lett. 29 077308 |
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Abstract We report that a metal-dielectric-metal cavity with a perforated top metallic film shows a remarkable polarization-selective collimation effect through reflection on the perforated film. According to simulations, such plasmonic cavities can achieve nearly perfect absorption (R<1.5%) of a transverse magnetic (TM) wave at an optimized incident angle while nearly perfect reflection (R∼100%) at normal incidence. A very wide incident angle range (approximately 15°–65°) is found to exhibit a high absorption ratio exceeding over 70%. In contrast, for a transverse electric (TE) wave, the plasmonic cavities remain highly reflective (R∼100%) regardless of the incident angles. We elucidate that this polarization- and angle-dependent behavior arises from an even-order (N=2) horizontal Fabry–Pérot (FP) resonant mode inside the plasmonic cavity. This effect may find potential applications for angle filtering of polarized divergent light beams in optics.
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Received: 27 April 2012
Published: 29 July 2012
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| PACS: |
73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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71.36.+c
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(Polaritons (including photon-phonon and photon-magnon interactions))
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42.79.Dj
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(Gratings)
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