Optimised low-loss multilayers for imaging with sub-wavelength resolution in the visible wavelength range

Details Optimised low-loss multilayers for imaging with sub-wavelength resolution in the visible wavelength range Optimised low-loss multilayers for imaging with sub-wavelength resolution in the visible wavelength range

2011-02-15

arxiv.org/abs/1102.3083v1

J. Appl. Phys. vol. 109, 084302 (2011)

Physics

Optics

Scientific paper

10.1063/1.3573479

We optimise the effective skin-depth and resolution of Ag-TiO2, Ag-SrTiO3, and Ag-GaP multilayers for imaging with sub-wavelength resolution. In terms of transmission and resolution the optimised multilayers outperform simple designs based on combined use of effective medium theory, impedance matching and Fabry-Perot resonances. For instance, an optimised Ag-GaP multilayer consisting of only 17 layers, operating at the wavelength of 490 nm and having a total thickness equal to one wavelength, combines 78% intensity transmission with a resolution of 60 nm. It is also shown that use of the effective medium theory leads to sub-optimal multilayer designs with respect to the trade-off between the skin depth and resolution already when the period of the structure is on the order of 40 nm or larger.

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