Analytic modal solution to transmission and collimation of light by one-dimensional nanostructured subwavelength metallic slits
| Autor: | Zhi-Yuan Li, Yi-Lei Hua |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 105:013104 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.3043885 |
| Popis: | Light transmitting through a subwavelength slit on an ordinary metal plate is diffracted to all directions but if the exit plane of the slit is patterned with periodical nanostructures, the diffracted light may be compressed into a collimated beam within a small angle. In this paper, we develop a rigorous theoretical method for solving the surface wave induced beam collimation in nanostructured subwavelength metallic slits. The method combines the analytical modal expansion method, the supercell technique, the transfer-matrix method, and the conventional Kirchhoff’s diffraction theory. It allows for quantitative investigation of coupling of the incident light into the guided wave of the slit and coupling of the guided wave out of the nanostructured exit plane. We have used the method to examine light transmission through the nanostructured metallic slit and the corresponding diffraction and beam collimation behaviors. We have extensively analyzed the angular transmission spectrum as a function of the nano... |
| Databáze: | OpenAIRE |
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