Modes of interaction between nanostructured metal and a conducting mirror as a function of separation and incident polarization

F. Bonnie; M. D. Arnold; G. B. Smith; A. R. Gentle

doi:10.1117/12.2022794

19 September 2013 Modes of interaction between nanostructured metal and a conducting mirror as a function of separation and incident polarization

F. Bonnie, M. D. Arnold, G. B. Smith, A. R. Gentle

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Proceedings Volume 8818, Nanostructured Thin Films VI; 881809 (2013) https://doi.org/10.1117/12.2022794
Event: SPIE NanoScience + Engineering, 2013, San Diego, California, United States

Abstract

The optical resonances that occur in nanostructured metal layers are modulated in thin film stacks if the nanostructured layer is separated from a reflecting conducting layer by various thicknesses of thin dielectric. We have measured and modeled the optical response of interacting silver layers, with alumina spacer thickness ranging from a few nm to 50 nm, for s- and p-polarized incident light, and a range of incident angles. Standard thin film models, including standard effective medium models for the nanostructured layer, will break down for spacer thickness below a critical threshold. For example, with polarisation in the film plane and some nano-islands, it may occur at around 10 nm depending on spacer refractive index. Of particular interest here are novel effects observed with the onset of percolation in the nanolayer. Hot spot effects can be modified by nearby mirrors. Other modes to consider include (a) a two-particle mode involving a particle and its mirror image (b) A Fano resonance from hybridisation of localized and de-localised plasmon modes (c) a Babinet’s core-(partial) shell particle with metal core-dielectric shell in metal (d) spacing dependent phase modulation (e) the impact of field gradients induced by the mirror at the nano-layer.

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F. Bonnie, M. D. Arnold, G. B. Smith, and A. R. Gentle "Modes of interaction between nanostructured metal and a conducting mirror as a function of separation and incident polarization", Proc. SPIE 8818, Nanostructured Thin Films VI, 881809 (19 September 2013); https://doi.org/10.1117/12.2022794

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KEYWORDS

Mirrors

Silver

Metals

Thin films

Data modeling

Reflectivity

Absorption

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