Spontaneous emission enhancement in metal-dielectric metamaterials
Ivan Iorsh, Alexander Poddubny, Alexey Orlov, Pavel Belov, Yuri, Kivshar
TL;DR
This paper investigates how layered metal-dielectric metamaterials can significantly enhance spontaneous emission rates, highlighting the limitations of traditional models and proposing an improved analytical approach.
Contribution
It introduces an analytical model accounting for nonlocal effects, providing accurate predictions of Purcell factors in hyperbolic metamaterials.
Findings
Ultra-high Purcell factors achieved in layered structures
Effective-medium theory underestimates emission enhancement
Analytical model aligns well with numerical results
Abstract
We study the spontaneous emission of a dipole emitter imbedded into a layered metal-dielectric metamaterial. We demonstrate ultra-high values of the Purcell factor in such structures due to a high density of states with hyperbolic isofrequency surfaces. We reveal that the traditional effective-medium approach greatly underestimates the value of the Purcell factor due to the presence of an effective nonlocality, and we present an analytical model which agrees well with numerical calculations.
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