Abstract
The present study theoretically investigates the radiative properties of a two-dimensional (2-D) multilayer structure that has a dielectric spacer between a metallic substrate and square cross-sectional metallic gratings. Differently from the one-dimensional metallic strips coated on a dielectric spacer atop an opaque metallic film [Opt. Express 16, 11328 (2008)], the 2-D metallic gratings can support the localized surface plasmon in addition to the propagating surface plasmon along the metal-dielectric interface. Moreover, the presence of a dielectric spacer also allows the excitation of magnetic polaritons. Underlying mechanisms of the surface and magnetic polartions on the proposed structure are elucidated by employing the 2-D rigorous coupled-wave analysis. The results obtained in this study will advance our fundamental understanding of light-matter interaction at the nanometer scale and will facilitate the development of engineered nanostructures for real-world applications, such as thermophotovoltaic and photovoltaic devices.
Highlights
Tailoring the radiative properties, such as reflectance, transmittance, and absorptance, with engineered nanostructures has recently drawn much attention due to their great potential in many promising applications, such as biosensing [1], thermophotovoltaic and photovoltaic energy conversions [2], and nano-manufacturing [3]
The present paper describes the theoretical investigation on the radiative properties of a 2-D multilayer structure that has a dielectric spacer between a metallic substrate and square crosssectional nanoslabs
The 2-D rigorous coupled-wave analysis has been developed to calculate the spectral reflectance of the multilayer structure as well as the magnetic field distribution in the near field
Summary
Tailoring the radiative properties, such as reflectance, transmittance, and absorptance, with engineered nanostructures has recently drawn much attention due to their great potential in many promising applications, such as biosensing [1], thermophotovoltaic and photovoltaic energy conversions [2], and nano-manufacturing [3]. The spectral- and/or directional-selectivity in the radiative properties of engineered nanostructures often result from the excitation of resonance phenomena, such as surface plasmon polariton (SPP). The key underlying mechanism of the SPP and LSP is the coupling of the incident wave with the collective charge density oscillations on the conductor [13]; they are usually observed at the metal-dielectric interface. From the SPP and the LSP, the key underlying mechanism of the MP is the coupling of the incident wave with the anti-parallel current on the metallic strips separated by a dielectric spacer [15, 23]. A number of studies have designed nanostructures to control the radiative properties using the SPP, LSP and the MP, most of them have mainly relied on 1-D structures due to the simplicity in modeling and often attempted to extrapolate the 1-D results to the 2-D structures.
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