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Proceedings Paper

Scattering engineering at the extreme with complex media (Conference Presentation)
Author(s): Francesco Monticone

Paper Abstract

The ability to control the optical scattering response of a material body is of crucial importance in different scientific areas and practical applications, spanning from light trapping for solar cells, to optical tweezers, near-field optical imaging, advanced meta-lenses, etc. In this talk, we review our recent efforts on engineering the optical scattering response at the extreme using complex material platforms and engineered nanostructures. We focus on three main topics in this exciting area. (a) We review some useful physical bounds on scattering and absorption imposed by causality and passivity, and discuss our recent investigation on broadband invisibility and absorption enhancement, with particular focus on the associated limits and the stability issues in the case of active media; we also elucidate the differences and similarities between invisible objects (cloaked objects and anapolar scatterers) and scatterers supporting nonradiating eigenmodes, or bound states in the continuum. (b) As an example of useful application of scattering suppression, we discuss the design of invisible near-field probes for scanning optical microscopy, realized by engineering their impedance at the nanoscale; we also discuss their experimental demonstration at infrared frequencies. (c) Finally, we demonstrate the potential of novel nonreciprocal and topological media to enable even more extreme scattering effects, for example ultra-low-frequency and shape-independent scattering resonances.

Paper Details

Date Published: 9 September 2019
Proc. SPIE 11081, Active Photonic Platforms XI, 110810C (9 September 2019); doi: 10.1117/12.2528531
Show Author Affiliations
Francesco Monticone, Cornell Univ. (United States)

Published in SPIE Proceedings Vol. 11081:
Active Photonic Platforms XI
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)

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