Influence of vertex angles on the extraordinary optical transmission characteristics of triangular and bow-tie-shaped apertures |
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| Authors: | Hai-Long Liu Na Wang Yong-Hong Liu Xi-Jun Wu |
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| Institution: | 1. Physics Department and Center for Free-Electron Laser Science, Universität Hamburg, 22761 Hamburg, Germany;2. Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung, Helmholtz-Zentrum Berlin für Materialen und Energie GmbH, 12489 Berlin, Germany;3. DESY Photon Science, 22607 Hamburg, Germany;1. Department of Integrative Structural and Computational Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA;2. Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717, USA;3. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, MS 99, Menlo Park, CA 94025, USA;4. Electrical and Computer Engineering, Cornell University, Weill Hall Room 135, Cornell University, Ithaca, NY 14853, USA |
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| Abstract: | The influence of vertex angles on the extraordinary optical transmission (EOT) characteristics of isosceles triangular apertures is numerically investigated with a three-dimensional finite-difference time-domain (FDTD) method. It has been found that the resonant peak characteristics are dependent on the vertex angles of triangular aperture (TA) and the polarized directions of incident light. The resonant peak amplitude is dramatically decreased, when the vertex angle is increased. A blue-shift/red-shift phenomenon is observed in both of the two cases. Detailed studies indicate that the transmission peak characteristics are due to the effects of localized surface plasmon modes excited along the sidewalls and Fabry–Pérot-like resonance. The EOT performance of TA arrays is compared with that of the rectangular aperture arrays. In addition, a bow-tie-shaped aperture (BTA) can be recognized as two overlapped TAs. The EOT properties of BTA with varying bow angles are also studied and analyzed. |
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