Topological phase transition in wire medium enables high Purcell factor at infrared frequencies

Abstract

In this paper, we study topological phase transition in a wire medium operating at infrared frequencies. This transition occurs in the reciprocal space between the indefinite (open-surface) regime of the metamaterial to its dielectric (closed-surface) regime. Due to the spatial dispersion inherent to wire medium, a hybrid regime turns out to be possible at the transition frequency. Both such surfaces exist at the same frequency and touch one another. At this frequency, all values of the axial wavevector correspond to propagating spatial harmonics. The implication of this regime is the overwhelming radiation enhancement. We numerically investigated the gain in radiated power for a sub-wavelength dipole source submerged into such the medium. In contrast to all previous works, this gain (called the Purcell factor) turns out to be higher for an axial dipole than for a transversal one.

References in corpus (3)

• Nonlocal Homogenization Model for a Periodic Array of Epsilon-Negative Rods
• Hyperbolic metamaterials: nonlocal response regularizes broadband super-singularity
• A System Analysis of Micron-Gap Thermophotovoltaic Systems Enhanced by Nanowires

Cited by in corpus (8)

• Lossless and loss-induced topological transitions of isofrequency surfaces of a composite magnetic-semiconductor medium
• Magnetic hyperbolic metamaterial of polaritonic nanowires
• Wire metamaterial filled metallic resonators
• Microgap thermophotovoltaic systems with low emission temperature and high electric output
• Controlling electromagnetic scattering with wire metamaterial resonators
• Topological transition in coated wire medium
• Enhanced nonlocal effects in metamaterials with moderate-index inclusions
• Characterizing critical exponents via Purcell effect