Efficient Light Funneling based on the non-Hermitian Skin Effect

Abstract

In the last two decades, the ubiquitous effect of dissipation has proven to entail astonishing non-Hermitian features, rather than just being an inescapable nuisance. As an alternative route to non-Hermiticity, we tailor the anisotropy of a lattice, which constitutes an, up to now, barely exploited degree of freedom. In this case, the appearance of an interface dramatically alters the entire eigenmode spectrum, leading to the exponential localization of all modes at the interface, which goes beyond the expectations for Hermitian systems. This effect is dubbed "non-Hermitian skin effect". We experimentally demonstrate it by studying the propagation of light in a large scale photonic mesh lattice. For arbitrary excitations, we find that light is always transported to the interface, realizing a highly efficient funnel for light.

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• Exact analogue of the Hatano-Nelson model in 1D continuous nonreciprocal systems
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• Arbitrary Control of Non-Hermitian Skin Modes via Disorder and An Electric Field
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• Liouvillian skin effects in two-dimensional electron systems at finite temperatures
• Emulating non-Hermitian dynamics in a finite non-dissipative quantum system