Tunable Light–Matter Interaction and the Role of Hyperbolicity in Graphene–hBN System

Kumar, Anshuman; Low, Tony; Fung, Kin Hung; Avouris, Phaedon; Fang, Nicholas X.

doi:10.1021/acs.nanolett.5b01191

Cited by 293 publications

(266 citation statements)

References 76 publications

(165 reference statements)

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“…The SPPPs, however, do not show up. This can be understood since the mode profile of SPPPs is largely confined on the surface with graphene [33], and this inherent inhomogeneity is not captured by EMT. The effect can be better seen from Fig.…”

Section: Hybrid Polaritons In Graphene/hbn Multilayersmentioning

confidence: 99%

Near-field heat transfer between graphene/hBN multilayers

et al. 2017

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We study the radiative heat transfer between multilayer structures made by a periodic repetition of a graphene sheet and a hexagonal boron nitride (hBN) slab. Surface plasmons in a monolayer graphene can couple with a hyperbolic phonon polaritons in a single hBN film to form hybrid polaritons that can assist photon tunneling. For periodic multilayer graphene/hBN structures, the stacked metallic/dielectric array can give rise to a further effective hyperbolic behavior, in addition to the intrinsic natural hyperbolic behavior of hBN. The effective hyperbolicity can enable more hyperbolic polaritons that enhance the photon tunneling and hence the near-field heat transfer. However, the hybrid polaritons on the surface, i.e. surface plasmon-phonon polaritons, dominate the near-field heat transfer between multilayer structures when the topmost layer is graphene. The effective hyperbolic regions can be well predicted by the effective medium theory (EMT), thought EMT fails to capture the hybrid surface polaritons and results in a heat transfer rate much lower compared to the exact calculation. The chemical potential of the graphene sheets can be tuned through electrical gating and results in an additional modulation of the heat transfer. We found that the near-field heat transfer between multilayer structure does not increase monotonously with the number of layer in the stack, which provides a way to control the heat transfer rate by the number of graphene layers in the multilayer structure. The results may benefit the applications of near-field energy harvesting and radiative cooling based on hybrid polaritons in two-dimensional materials.

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Section: Hybrid Polaritons In Graphene/hbn Multilayersmentioning

confidence: 99%

Near-field heat transfer between graphene/hBN multilayers

et al. 2017

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“…Furthermore, h-BN is a particularly good match for graphene, since they share very similar lattices such that h-BN helps maintain the high mobility of graphene [44]. Such a graphene-h-BN combined system has been studied in the literature [33,45]. Fig .…”

Section: A Optical Modulatormentioning

confidence: 99%

Metasurface perfect absorber based on guided resonance of a photonic hypercrystal

et al. 2016

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By exploiting the guided resonance of a photonic hypercrystal -a periodic structure that combines the properties of hyperbolic materials and photonic crystals -we numerically demonstrate a perfect absorber consisting of a photonic hypercrystal slab, a dielectric spacer and a back reflector. The guided resonance of the photonic hypercrystal slab creates a field enhancement and confinement within a deep subwavelength thickness; therefore, the ultra-thin photonic hypercrystal slab serves as a two-dimensional resonator that can be treated accurately as a metasurface. We show that the perfect absorber is equivalent to a metasurface Salisbury screen, where the metasurface formed by the photonic hypercrystal slab provides the appropriate electric sheet conductivity required for critical coupling. We also present examples of combining the perfect absorber with graphene to make optical modulators and to improve the absorption in graphene photodetectors.

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“…Since both graphene plasmons and hBN phonons reside in the mid-IR, the optical properties of graphene-hBN heterostructures would allow one to marry the advantage of their constituents: electrical tunability in the former and high quality factor of the latter. Therefore, recently it has been investigated theoretically [4] and verified experimentally [5,6,9] that, due to the hybridization of surface plasmon polaritons in graphene with the hyperbolic phonon polaritons of a thin film of hBN, the hyperbolic polaritons can be effectively modulated in a van der Waals heterostructure composed of a monolayer of graphene on hBN. Consequently, the eigenmodes of the graphene-hBN metastructure are hybrid plasmon-phonon polaritons (HPPs) [9].…”

Section: Introductionmentioning

confidence: 99%

“…Heterostructures composed of graphene and hexagonal boron nitride (hBN) have recently attracted a great deal of attention due to their unusual electronic band structure, which is sensitive to the crystallographic alignment between graphene and hBN [1][2][3] and also because of their optical properties [4][5][6]. hBN is a natural hyperbolic material, for which the dielectric constants are the same in the basal plane (ϵ t ≡ ϵ x ϵ y ) but have opposite signs (ϵ t ϵ z < 0) in the normal one (ϵ z ) in the mid-infrared (mid-IR) region.…”

Section: Introductionmentioning

confidence: 99%

Hybrid plasmon–phonon polariton bands in graphene–hexagonal boron nitride metamaterials [Invited]

et al. 2017

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We theoretically investigate mid-infrared electromagnetic wave propagation in multilayered graphene-hexagonal boron nitride (hBN) metamaterials. Hexagonal boron nitride is a natural hyperbolic material that supports highly dispersive phonon polariton modes in two Reststrahlen bands with different types of hyperbolicity. Due to the hybridization of surface plasmon polaritons of graphene and hyperbolic phonon polaritons of hBN, each isolated unit cell of the graphene-hBN metamaterial supports hybrid plasmon-phonon polaritons (HPPs). Through the investigation of band structure of the metamaterial we find that, due to the coupling between the HPPs supported by each unit cell, the graphene-hBN metamaterial can support HPP bands. The dispersion of these bands can be noticeably modified for different thicknesses of hBN layers, leading to the appearance of bands with considerably flat dispersions. Moreover, analysis of light transmission through the metamaterial reveals that this system is capable of supporting high-k propagating HPPs. This characteristic makes graphene-hBN metamaterials very promising candidates for the modification of the spontaneous emission of a quantum emitter, hyperlensing, negative refraction, and waveguiding.

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Tunable Light–Matter Interaction and the Role of Hyperbolicity in Graphene–hBN System

Cited by 293 publications

References 76 publications

Near-field heat transfer between graphene/hBN multilayers

Near-field heat transfer between graphene/hBN multilayers

Metasurface perfect absorber based on guided resonance of a photonic hypercrystal

Hybrid plasmon–phonon polariton bands in graphene–hexagonal boron nitride metamaterials [Invited]

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