Absorption and amplification singularities in metasurface etalons with gain
Nelson de Gaay Fortman, Georg-Michael Krause, Peter Schall, A. Femius Koenderink
TL;DR
The paper explores how metasurfaces with optical gain can achieve both perfect absorption and amplification of light, impacting non-Hermitian photonics and active metasurface design.
Contribution
The novel contribution is the analysis of gain-induced singularities in metasurface etalons using a transfer matrix model, revealing topological constraints and amplification conditions.
Findings
Gain media can induce perfect absorption and amplification singularities in metasurface etalons.
Topological constraints govern the creation and annihilation of these singularities.
Time reversal symmetry arguments have limitations in relating gain and absorption conditions.
Abstract
Passive reflective metasurfaces can possess perfect absorption conditions: Singular scattering anomalies at which all impinging light is absorbed. Perfect absorption is a common yet powerful metasurface design option with applications in energy harvesting, sensing, and more. Less common is the inclusion of optical gain to the system, which can give rise to a singular condition for perfect amplification. We analyze absorption and amplification singularities in plasmon antenna metasurface etalons with gain with a simple transfer matrix model. Our etalon follows the Salisbury screen design: A metal ground plate spaced by dielectric medium from an array of resonant plasmonic scatterers. We include frequency dispersive models for gain media and discuss the limitations of time reversal symmetry arguments for relating gain singularity conditions (reflectivity poles) to the well-known perfect…
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Taxonomy
TopicsMetamaterials and Metasurfaces Applications · Quantum Mechanics and Non-Hermitian Physics · Quantum optics and atomic interactions