Measurements of the negative refractive index of sub-diffraction waves propagating in an indefinite permittivity medium

Korobkin, Dmitriy; Neuner, Burton; Fietz, Chris; Jegenyés, Nikoletta; Ferro, Gabriel; Shvets, Gennady

doi:10.1364/oe.18.022734

Cited by 43 publications

(38 citation statements)

References 33 publications

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“…Unlike plasmonic/dielectric hyperbolic metamaterials, hBN was shown to offer the potential to invert the sign of the permittivity along a given axis, while maintaining low optical losses and offer a one atom thick unit cell. Additionally, this inversion of the sign of the permittivity was also reported for SiO 2 /SiC/SiO 2 SPhP-based metamaterial designs [81]. Further investigations into other polar dielectric van der Waals crystals [76] and polar dielectric crystals [77] should experimentally demonstrate a wealth of such low-loss, naturally hyperbolic materials as well as potentially uncover other unanticipated optical properties.…”

Section: Introduction To Surface Phonon Polaritonssupporting

confidence: 54%

Low-loss, infrared and terahertz nanophotonics using surface phonon polaritons

et al. 2015

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Abstract:The excitation of surface-phonon-polariton (SPhP) modes in polar dielectric crystals and the associated new developments in the field of SPhPs are reviewed. The emphasis of this work is on providing an understanding of the general phenomenon, including the origin of the Reststrahlen band, the role that optical phonons in polar dielectric lattices play in supporting sub-diffraction-limited modes and how the relatively long optical phonon lifetimes can lead to the low optical losses observed within these materials. Based on this overview, the achievements attained to date and the potential technological advantages of these materials are discussed for localized modes in nanostructures, propagating modes on surfaces and in waveguides and novel metamaterial designs, with the goal of realizing low-loss nanophotonics and metamaterials in the mid-infrared to terahertz spectral ranges.

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Section: Introduction To Surface Phonon Polaritonssupporting

confidence: 54%

Low-loss, infrared and terahertz nanophotonics using surface phonon polaritons

et al. 2015

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“…Additionally, the use of metallic layers that are plagued by considerable losses 6,20 caused the resonances to be rather broad (quality factors 4, where and Δω are the resonant frequency and linewidth) and the number of the modes observed 17 to be limited to just the first and in some cases second orders. Alternative approaches utilizing low-loss materials, such as those incorporating polar dielectrics supporting surface phonon polaritons in place of surface plasmons can offer potential improvements and in some cases additional functionality, 21,22 such as multi-frequency hyperlensing. 22 However, in all of these previously discussed hyperbolic metamaterials, the sign of the permittivity tensor was fixed by the geometry of the hybrid structure, resulting in either Type I or Type II behavior for a given sample.…”

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confidence: 99%

Sub-diffractional volume-confined polaritons in the natural hyperbolic material hexagonal boron nitride

et al. 2014

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Strongly anisotropic media, where the principal components of the dielectric tensor have opposite signs, are called hyperbolic. Such materials exhibit unique nanophotonic properties enabled by the highly directional propagation of slow-light modes localized at deeply subdiffractional length scales. While artificial hyperbolic metamaterials have been demonstrated, they suffer from high plasmonic losses and require complex nanofabrication, which in turn induces size-dependent limitations on optical confinement. The low-loss, mid-infrared, natural hyperbolic material hexagonal boron nitride is an attractive alternative. Here we report on three-dimensionally confined 'hyperbolic polaritons' in boron nitride nanocones that support four series (up to the seventh order) modes in two spectral bands. The resonant modes obey the predicted aspect ratio dependence and exhibit high-quality factors (Q up to 283) in the strong confinement regime (up to l/86). These observations assert hexagonal boron nitride as a promising platform for studying novel regimes of light-matter interactions and nanophotonic device engineering.

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“…where ω is the frequency of operation, ω ∞ = 6.7 and γ = 0.9 × 10 12 Hz. We note that this realization formed the testbed for the first complete characterization of the modes of hyperbolic media due to their low loss as compared to plasmonic media 70 . The modes of this HMM can be excited at relatively lower temperatures (400-500K) when the peak of black body emission lies within the Reststrahlen band of SiC.…”

Section: Resultsmentioning

confidence: 96%

Fluctuational electrodynamics of hyperbolic metamaterials

Guo¹,

Jacob²

2014

Journal of Applied Physics

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We give a detailed account of equilibrium and non-equilibrium fluctuational electrodynamics of hyperbolic metamaterials. We show the unifying aspects of two different approaches; one utilizes the second kind of fluctuation dissipation theorem and the other makes use of the scattering method. We analyze the near-field of hyperbolic media at finite temperatures and show that the lack of spatial coherence can be attributed to the multi-modal nature of super-Planckian thermal emission. We also adopt the analysis to phonon-polaritonic super-lattice metamaterials and describe the regimes suitable for experimental verification of our predicted effects. The results reveal that far-field thermal emission spectra are dominated by epsilon-near-zero and epsilon-near-pole responses as expected from Kirchoff's laws. Our work should aid both theorists and experimentalists to study complex media and engineer equilibrium and non-equilibrium fluctuations for applications in thermal photonics.Comment: 13 pages, 8 figure

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Measurements of the negative refractive index of sub-diffraction waves propagating in an indefinite permittivity medium

Cited by 43 publications

References 33 publications

Low-loss, infrared and terahertz nanophotonics using surface phonon polaritons

Low-loss, infrared and terahertz nanophotonics using surface phonon polaritons

Sub-diffractional volume-confined polaritons in the natural hyperbolic material hexagonal boron nitride

Fluctuational electrodynamics of hyperbolic metamaterials

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