Spectrally stable thermal emitters enabled by material-based high-impedance surfaces

Abstract

Radiative thermal engineering with subwavelength metallic bodies is a key element for heat and energy management applications, communication and sensing.

Addressing the impact of surface roughness on epsilon-near-zero substrates

“…A variety of wave phenomena emerges from the different physics of ENZ media, examples including supercoupling [5,6] and ideal fluid flow [7,8], geometry-invariant resonators [9], directive emission [10,11], photonic doping [12], nonradiating modes [13][14][15] and guided modes with a flat dispersion profile [16][17][18], just to name a few. Moreover, ENZ media intrinsically enhances light-matter interactions, as it is the case for nonlinear optics [19][20][21][22][23], electrical [24,25] and optical [26,27] modulation, spontaneous emission [28][29][30][31], magnon-optical photon coupling [32,33], entanglement generation [34,35], and light concentration on ultra-thin metallic films for thermal emitters [36,37] and optoelectronic [38] devices.…”

“…SiC is also an excellent material platform for investigating the impact of surface roughness on ENZ media for two reasons: First, it has a high-quality ENZ response, which has enabled the experimental demonstration of frequency pinning of resonant nanoantennas [53], ENZ high-impedance thermal emitters [36,37], and ENZ waveguide and cavity modes [54,55]. Second, its permittivity has a Lorentzian dispersion profile, including a band of negative permittivity supporting the propagation of surface phonon polaritons (SPhP), as well as frequency bands with a dielectric response.…”

Addressing the Impact of Surface Roughness on Epsilon-Near-Zero Silicon Carbide Substrates

“…52 The excellent optical properties of SiC have facilitated experimental demonstrations of superlensing, 53 extraordinary transmission, 54 thermal emitters driven by waste heat, 55 and parametric amplification of phonons. 56 SiC is also an excellent material platform for investigating the impact of surface roughness on ENZ media for two reasons: First, it has a high-quality ENZ response, which has enabled the experimental demonstration of frequency pinning of resonant nanoantennas, 57 ENZ high-impedance thermal emitters, 36,37 and ENZ waveguide and cavity modes. 58,59 Second, its permittivity has a Lorentzian dispersion profile, including a band of negative permittivity supporting the propagation of surface phonon polaritons (SPhP), as well as frequency bands with a dielectric response.…”

“…SiC is also an excellent material platform for investigating the impact of surface roughness on ENZ media for two reasons: First, it has a high-quality ENZ response, which has enabled the experimental demonstration of frequency pinning of resonant nanoantennas, ENZ high-impedance thermal emitters, , and ENZ waveguide and cavity modes. , Second, its permittivity has a Lorentzian dispersion profile, including a band of negative permittivity supporting the propagation of surface phonon polaritons (SPhP), as well as frequency bands with a dielectric response. As schematically depicted in Figure , a variety of polaritonic phenomena is excited at a rough SiC substrate, including distinct ENZ field distributions, propagating and localized SPhP, and coupling to zone-folded longitudinal phonons (ZFLO).…”

“…Epsilon-near-zero (ENZ) media, i.e., materials and/or metamaterial constructs with a near-zero permittivity, have become a very active field of research field due to their qualitatively different optical behavior. − A variety of wave phenomena emerge from the different physics of ENZ media, for example, supercoupling , and ideal fluid flow, , geometry-invariant resonators, directive emission, , photonic doping, nonradiating modes, − and guided modes with a flat dispersion profile, − just to name a few. Moreover, ENZ media intrinsically enhances light–matter interactions, as is the case for nonlinear optics, − electrical , and optical , modulation, spontaneous emission, − magnon-optical photon coupling, , entanglement generation, , and light concentration on ultrathin metallic films for thermal emitters , and optoelectronic devices. Additionally, ENZ systems are currently being used in prototypes of compact antennas and microwave network components, as well as for analog optical computing …”