Plasmon–phonon coupling in graphene–hyperbolic bilayer heterostructures

Yin, Geping; Yuan, Jun; Jiang, Wei; Zhu, Jin; Ma, Yungui

doi:10.1088/1674-1056/25/11/114216

Cited by 4 publications

(5 citation statements)

References 39 publications

(47 reference statements)

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“…These bounded surface modes carry high density of state of photons and can largely raise the evanescent wave tunneling and thus overall thermal radiation efficiency, as found in the measurement. This effect will be more obvious at smaller gaps or replacing Si with a low-index substrate that will enhance the bandwidth and intensity of the bounded modes 45 .…”

Section: Resultsmentioning

confidence: 99%

“…It needs to be pointed out that silicon may not be the best choice to host grapheme if one wants to maximize the heat flux and for this aim polar materials such as silica or BN may be used where the occurrence of plasmon–phonon hybridization can further strengthen the tunneling of evanescent waves 20 , 45 . However, the Si/Gr heterostructure proposed here can provide a promising framework to harvest thermal energy.…”

Section: Resultsmentioning

confidence: 99%

“…Compared with that on the i-Si substrate, the asymmetrical super-mode nature of the evanescent-wave band does not change (Fig. 5e) but the dispersion diagram shifts to lower frequencies and in this case the interlayer coupling will be weakened in particular at large gaps (e.g., d > 100 nm) 45 . On the other hand, the momentum and mode pattern matches will improve the near-field coupling of plasmonic polaritons between graphene and silicon substrate.…”

Section: Graphene On Doped Silicon (D-si)mentioning

confidence: 92%

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Observing of the super-Planckian near-field thermal radiation between graphene sheets

Jiang¹,

Du²,

Su³

et al. 2018

Nat Commun

Self Cite

134

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Thermal radiation can be substantially enhanced in the near-field scenario due to the tunneling of evanescent waves. Monolayer graphene could play a vital role in this process owing to its strong infrared plasmonic response, however, which still lacks an experimental verification due to the technical challenges. Here, we manage to make a direct measurement about plasmon-mediated thermal radiation between two macroscopic graphene sheets using a custom-made setup. Super-Planckian radiation with efficiency 4.5 times larger than the blackbody limit is observed at a 430-nm vacuum gap on insulating silicon hosting substrates. The positive role of graphene plasmons is further confirmed on conductive silicon substrates which have strong infrared loss and thermal emittance. Based on these, a thermophotovoltaic cell made of the graphene–silicon heterostructure is lastly discussed. The current work validates the classic thermodynamical theory in treating graphene and also paves a way to pursue the application of near-field thermal management.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Graphene On Doped Silicon (D-si)mentioning

confidence: 92%

See 1 more Smart Citation

Observing of the super-Planckian near-field thermal radiation between graphene sheets

Jiang¹,

Du²,

Su³

et al. 2018

Nat Commun

Self Cite

134

View full text Add to dashboard Cite

show abstract

“…In the investigation of the performance of the BSW sensor, the reflectance, sensitivity, field distribution as well as figure of merit (FOM) are analyzed through the transfer-matrix method (TMM). [34,35] The EM fields of the transfer-matrix polarized wave (H x = H z = 0, E y = 0) in each layer ( j) can be described as…”

Section: Theoretical Background and Modelmentioning

confidence: 99%

“…x . [35] The propagation matrix that propagates freely through a given material is given by The dynamic matrix that propagates through the boundary of two dielectrics is defined as…”

Section: Theoretical Background and Modelmentioning

confidence: 99%

Confinement of Bloch surface waves in a graphene-based one-dimensional photonic crystal and sensing applications

Zou¹,

Zheng²,

Chen³

2018

Chinese Phys. B

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Bloch surface waves (BSWs) are excited in one-dimensional photonic crystals (PhCs) terminated by a graphene monolayer under the Kretschmann configuration. The field distribution and reflectance spectra are numerically calculated by the transverse magnetic method under transfer-matrix polarization, while the sensitivity is analyzed and compared with those of the surface plasmon resonance sensing method. It is found that the intensity of magnetic field is considerably enhanced in the region of the terminated layer of the multilayer stacks, and that BSW resonance appears only in the interface of the graphene and solution. Influences of the graphene layers and the thickness of a unit cell in PhCs on the reflectance are studied as well. In particular, by analyzing the performance of BSW sensors with the graphene monolayer, the wavelength sensitivity of the proposed sensor is 1040 nm/RIU whereas the angular sensitivity is 25.1 • /RIU. In addition, the maximum of figure of merit can reach as high as 3000 RIU −1 . Thus, by integrating graphene in a simple Kretschmann structure, one can obtain an enhancement of the light-graphene interaction, which is prospective for creating label-free, low-cost and high-sensitivity optical biosensors.

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Graphene Metamaterials for Intense, Tunable, and Compact Extreme Ultraviolet and X‐Ray Sources

et al. 2019

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The interaction of electrons with strong electromagnetic fields is fundamental to the ability to design high‐quality radiation sources. At the core of all such sources is a tradeoff between compactness and higher output radiation intensities. Conventional photonic devices are limited in size by their operating wavelength, which helps compactness at the cost of a small interaction area. Here, plasmonic modes supported by multilayer graphene metamaterials are shown to provide a larger interaction area with the electron beam, while also tapping into the extreme confinement of graphene plasmons to generate high‐frequency photons with relatively low‐energy electrons available from tabletop sources. For 5 MeV electrons, a metamaterial of 50 layers and length 50 µm, and a beam current of 1.7 µA, it is, for instance, possible to generate X‐rays of intensity 1.5 × 107 photons sr−1 s−1 1%BW, 580 times more than for a single‐layer design. The frequency of the driving laser dynamically tunes the photon emission spectrum. This work demonstrates a unique free‐electron light source, wherein the electron mean free path in a given material is longer than the device length, relaxing the requirements of complex electron beam systems and potentially paving the way to high‐yield, compact, and tunable X‐ray sources.

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Plasmon–phonon coupling in graphene–hyperbolic bilayer heterostructures

Cited by 4 publications

References 39 publications

Observing of the super-Planckian near-field thermal radiation between graphene sheets

Observing of the super-Planckian near-field thermal radiation between graphene sheets

Confinement of Bloch surface waves in a graphene-based one-dimensional photonic crystal and sensing applications

Graphene Metamaterials for Intense, Tunable, and Compact Extreme Ultraviolet and X‐Ray Sources

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