Abstract
By utilizing the strongly induced plasmon coupling between discrete nano-antennas and quantitatively controlling the crystalline proportions of an underlying Ge2Sb2Te5 (GST) phase-change thin layer, we show that nanoscale light localizations in the immediate proximity of plasmonic nano-antennas can be spatially positioned. Isolated energy hot-spots at a subwavelength scale can be created and adjusted across the landscape of the plasmonic system at a step resolution of λ/20. These findings introduce a new approach for nano-circuitry, bio-assay addressing and imaging applications.
Highlights
With the rapid development of nanophotonics, increasing attention has been focused on the precise control of the highly confined optical fields on a nanoscale
By utilizing the strongly induced plasmon coupling between discrete nano-antennas and quantitatively controlling the crystalline proportions of an underlying Ge2Sb2Te5 (GST) phase-change thin layer, we show that nanoscale light localizations in the immediate proximity of plasmonic nano-antennas can be spatially positioned
To achieve the goal of controlling nanoscale light localizations, conventional focusing methods have been proved insufficient as the optical wavelength is on a much larger microscale, whereas promising approaches that use various types of nanostructures and manipulate different characteristics of an incident light beam have emerged [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]
Summary
With the rapid development of nanophotonics, increasing attention has been focused on the precise control of the highly confined optical fields on a nanoscale. We demonstrate a novel approach in which the constituent plasmonic resonators placed on a thin film of phase-change material can be selectively excited, generating isolated near-field energy hot-spots with selective excitation under a monochromatic plane wave illumination.
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