22 February 2012 Tunable plasmonic nanostructures for light trapping and strong field enhancement at the metal surface
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Abstract
A subwavelength plasmonic grating with rectangular grooves on the metal surface is an efficient light trapper with designer resonance position and angular bandwidth. In this work, a new method is presented, where the grooves are filled with a dielectric resulting in a large shift of the resonance wavelength. A case study of a gold grating with grooves 18 nm wide and 47 nm deep is presented, where the resonance is shifted from original 720 nm to 960 nm by filling the grooves with an n = 1.4 immersion oil.
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Aleksandr Polyakov, Aleksandr Polyakov, Kevin F. Thompson, Kevin F. Thompson, Stefano Cabrini, Stefano Cabrini, Peter J. Schuck, Peter J. Schuck, Howard A. Padmore, Howard A. Padmore, } "Tunable plasmonic nanostructures for light trapping and strong field enhancement at the metal surface", Proc. SPIE 8269, Photonic and Phononic Properties of Engineered Nanostructures II, 82691X (22 February 2012); doi: 10.1117/12.909038; https://doi.org/10.1117/12.909038
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