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The chalcogenides represent a unique material platform, capable of providing high-index dielectric, plasmonic, ‘epsilon-near-zero’ (ENZ) or topological insulator properties when the constituent elements are combined in the right proportion. Moreover, they can exhibit reversible, non-volatile structural transitions between solid phases with vastly different electromagnetic properties. We report here...
We experimentally demonstrate a new coherent absorption phenomenon, through which a planar photonic metamaterial may resonantly absorb 100% of incident light. The effect is a time-reversed analogue ‘Lasing Spaser’ action.
We show experimentally that highly localized excitations in planar plasmonic metamaterials drive spatially-coherent, directional, threshold-free light emission, providing a platform for the development of a new generation of nanoscale light sources.
A nanoscale plasmonic metal film can amplify free-electron evanescent fields, leading to strongly enhanced light emission via Smith-Purcell effect through a mechanism analogous to the ‘poor-man's superlens’ for optical evanescent field enhancement.
We review our recent results in the development of nanostructured photonic metamaterials which provide unprecedented levels of active (nonlinear, switchable, tunable) control over light on the sub-wavelength scale.
Free-standing and fiber-coupled photonic metamaterials act as nanoscale, free-electron-driven, tuneable light sources: emission occurs at wavelengths determined by structural geometry in response to electron-beam excitation of metamaterial resonant plasmonic modes.
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