Brewster plasmons: new optical degrees of freedom driving the forced repose of nanostructures (Conference Presentation)

Gilad Rosenblatt; Boris Simkhovich; Meir Orenstein

doi:10.1117/12.2320580

17 September 2018 Brewster plasmons: new optical degrees of freedom driving the forced repose of nanostructures (Conference Presentation)

Gilad Rosenblatt, Boris Simkhovich, Meir Orenstein

Author Affiliations +

Proceedings Volume 10719, Metamaterials, Metadevices, and Metasystems 2018; 107191R (2018) https://doi.org/10.1117/12.2320580
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

Optical degrees of freedom shape the nature of light-matter interaction. In photonic structures, optical degrees of freedom are commonly described by electromagnetic modes. However, because modes only describe the free-oscillations of light in a structure, they properly account for light-matter interaction only if the physics in question stems solely from the structure rather than be driven by a source. This condition is often violated in nanophotonic systems, envisaged to combine nanoscale geometries and compact light sources into unified functional platforms. Therefore, in such nanostructures the source necessarily induces a tangible forced response not described by electromagnetic modes. Here we experimentally and theoretically explore a new class of optical degrees of freedom that drives the forced response of nanostructures in the presence of sources: Brewster plasmons. We experimentally observe and theoretically prove their existence in a variety of nanostructures, ranging from thin gold films to complex stratified media. We demonstrate with both far-field and near-field measurements that Brewster plasmons exhibit unique nontrivial topological properties compared to standard photonic modes and surface plasmons. These include far-field observable complex fields, exceptional points in which several Brewster plasmons coalesce, and polarization-independent flat-dispersion responses. Moreover, we show that some well-known plasmonic phenomena commonly attributed to surface plasmons actually stem from Brewster plasmon excitations, most notably the Kretschmann reflectance dip and the superlensing effect. Finally, we discuss the future role Brewster plasmons can play in propelling nanophotonics applications, such as in the field of biosensing.

Conference Presentation

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Gilad Rosenblatt, Boris Simkhovich, and Meir Orenstein "Brewster plasmons: new optical degrees of freedom driving the forced repose of nanostructures (Conference Presentation)", Proc. SPIE 10719, Metamaterials, Metadevices, and Metasystems 2018, 107191R (17 September 2018); https://doi.org/10.1117/12.2320580

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KEYWORDS

Plasmons

Nanostructures

Near field optics

Electromagnetism

Light-matter interactions

Nanophotonics

Surface plasmons

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