Photon Tunneling via Coupling Graphene Plasmons With Phonon Polaritons of Hexagonal Boron Nitride in Reststrahlen Bands

ASME 2021 Heat Transfer Summer Conference ◽

10.1115/ht2021-62180 ◽

2021 ◽

Author(s):

Ruiyi Liu ◽

Xiaohu Wu ◽

Zheng Cui

Keyword(s):

Boron Nitride ◽

Chemical Potential ◽

Hexagonal Boron Nitride ◽

Near Field ◽

Tunneling Probability ◽

Coupling Mechanism ◽

Work Study ◽

Photon Tunneling ◽

Phonon Polaritons ◽

Graphene Plasmons

Abstract The photon tunneling probability is the most important thing in near-field radiative heat transfer (NFRHT). This work study the photon tunneling via coupling graphene plasmons with phonon polaritons in hexagonal boron nitride (hBN). We consider two cases of the optical axis of hBN along z-axis and x-axis, respectively. We investigate the NFRHT between graphene-covered bulk hBN, and compare it with that of bare bulk hBN. Our results show that in Reststrahlen bands, the coupling of graphene plasmons and phonon polaritons in hBN can either suppress or enhance the photon tunneling probability, depending on the chemical potential of graphene and frequency. This conclusion holds when the optiacal axis of hBN is either along z-axis or x-axis. The findings in this work not only deepen our understanding of coupling mechanism between graphene plasmons with phonon polaritons, but also provide a theoretical basis for controlling photon tunneling in graphene covered hyperbolic materials.

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Enhanced Photon Tunneling by Surface Plasmon–Phonon Polaritons in Graphene/hBN Heterostructures

Journal of Heat Transfer ◽

10.1115/1.4034793 ◽

2016 ◽

Vol 139 (2) ◽

Cited By ~ 35

Author(s):

B. Zhao ◽

Z. M. Zhang

Keyword(s):

Heat Transfer ◽

Surface Plasmon ◽

Chemical Potential ◽

Near Field ◽

Tunneling Probability ◽

Monolayer Graphene ◽

Field Energy ◽

Support Surface ◽

Photon Tunneling ◽

Phonon Polaritons

Enhancing photon tunneling probability is the key to increasing the near-field radiative heat transfer between two objects. It has been shown that hexagonal boron nitride (hBN) and graphene heterostructures can enable plentiful phononic and plasmonic resonance modes. This work demonstrates that heterostructures consisting of a monolayer graphene on an hBN film can support surface plasmon–phonon polaritons that greatly enhance the photon tunneling and outperform individual structures made of either graphene or hBN. Both the thickness of the hBN films and the chemical potential of graphene can affect the tunneling probability, offering potential routes toward passive or active control of near-field heat transfer. The results presented here may facilitate the system design for near-field energy harvesting, thermal imaging, and radiative cooling applications based on two-dimensional materials.

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High-Q dark hyperbolic phonon-polaritons in hexagonal boron nitride nanostructures

Nanophotonics ◽

10.1515/nanoph-2020-0048 ◽

2020 ◽

Vol 9 (6) ◽

pp. 1457-1467 ◽

Cited By ~ 1

Author(s):

Georg Ramer ◽

Mohit Tuteja ◽

Joseph R. Matson ◽

Marcelo Davanco ◽

Thomas G. Folland ◽

...

Keyword(s):

Boron Nitride ◽

Cross Sections ◽

Hexagonal Boron Nitride ◽

Near Field ◽

High Q ◽

Surface Phonon Polaritons ◽

Previous Hypothesis ◽

Phonon Polaritons ◽

Field Reflectance ◽

Strong Confinement

AbstractThe anisotropy of hexagonal boron nitride (hBN) gives rise to hyperbolic phonon-polaritons (HPhPs), notable for their volumetric frequency-dependent propagation and strong confinement. For frustum (truncated nanocone) structures, theory predicts five, high-order HPhPs, sets, but only one set was observed previously with far-field reflectance and scattering-type scanning near-field optical microscopy. In contrast, the photothermal induced resonance (PTIR) technique has recently permitted sampling of the full HPhP dispersion and observing such elusive predicted modes; however, the mechanism underlying PTIR sensitivity to these weakly-scattering modes, while critical to their understanding, has not yet been clarified. Here, by comparing conventional contact- and newly developed tapping-mode PTIR, we show that the PTIR sensitivity to those weakly-scattering, high-Q (up to ≈280) modes is, contrary to a previous hypothesis, unrelated to the probe operation (contact or tapping) and is instead linked to PTIR ability to detect tip-launched dark, volumetrically-confined polaritons, rather than nanostructure-launched HPhPs modes observed by other techniques. Furthermore, we show that in contrast with plasmons and surface phonon-polaritons, whose Q-factors and optical cross-sections are typically degraded by the proximity of other nanostructures, the high-Q HPhP resonances are preserved even in high-density hBN frustum arrays, which is useful in sensing and quantum emission applications.

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High-efficiency modulation of coupling between different polaritons in an in-plane graphene/hexagonal boron nitride heterostructure

Nanoscale ◽

10.1039/c8nr08334g ◽

2019 ◽

Vol 11 (6) ◽

pp. 2703-2709 ◽

Cited By ~ 7

Author(s):

Xiangdong Guo ◽

Hai Hu ◽

Debo Hu ◽

Baoxin Liao ◽

Ke Chen ◽

...

Keyword(s):

Boron Nitride ◽

High Efficiency ◽

Hexagonal Boron Nitride ◽

Van Der Waals ◽

Two Dimensional ◽

Low Loss ◽

Nanophotonic Devices ◽

Phonon Polaritons ◽

Graphene Plasmons

Two-dimensional van der Waals (vdW) materials have a full set of highly confined polariton modes, such as low-loss phonon polaritons and dynamically tunable graphene plasmons, which provide a solution for integrated nanophotonic devices by combining the unique advantages of different polaritons.

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