Transmission Enhancement Through Nanoscale Metallic Slit Arrays from the Visible to Mid-Infrared

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Abstract:

In this paper, we systematically investigate the transmission enhancement through nanoscale metallic slit arrays in the wavelength range from visible to mid-infrared. The far-field transmittance of the periodic structure is calculated using the rigorous coupled-wave analysis (RCWA). The electro-magnetic field distribution in the near-field regime is analyzed to elucidate three mechanisms for transmission enhancement. Depending on the spectral region, the enhanced transmission can be attributed to Wood's anomaly, cavity resonance, and the effective-medium behavior. The effects of grating/slit geometry, polarization, and the plane-of-incidence orientation on the radiation transmission are also examined.

Keywords: ELECTROMAGNETIC WAVE; FAR-FIELD TRANSMITTANCE; NANOSLITS; NEAR-FIELD EFFECT

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jctn.2008.008

Publication date: February 1, 2008

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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