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Near-field heat transfer between graphene-Si grating heterostructures with multiple magnetic-polaritons coupling
KTH, School of Electrical Engineering and Computer Science (EECS), Electromagnetic Engineering.ORCID iD: 0000-0002-3401-1125
2019 (English)In: International Journal of Heat and Mass Transfer, ISSN 0017-9310, E-ISSN 1879-2189, Vol. 134, p. 1119-1126Article in journal (Refereed) Published
Abstract [en]

Near-field thermal radiation (NFTR) between two graphene-covered Si grating (G/Si grating) heterostructures consisting of multilayered G/Si grating cells is investigated, in comparison with that between single-G/Si-grating-cell structures. The calculations are based on the scattering theory utilizing rigorous coupled-wave analysis (RCWA). It is found that strong magnetic polaritons (MPs) can be induced in the single G/Si grating cell, and coupling of multiple MPs can be observed in multilayered G/Si grating heterostructures, which leads to a broader band of high photon-tunnelling probabilities in the phase space. As a result, when the thickness of each grating layer is fixed, the heat flux of the 4-G/Si grating heterostructures, with chemical potential μ = 0.1 eV and grating period L x = 80 nm, is 1.65- and 9.12-fold larger than those of the 1-G/Si grating and only Si grating structures at d = 100 nm, respectively. When the total thickness of the entire G/Si grating heterostructure is fixed, the 1-G/Si grating model performs better than 2- or 4-G/Si grating models because higher loss inherited from additional graphene sheets would reduce the momenta of the near-unity energy transmission coefficient in the k-space.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 134, p. 1119-1126
Keywords [en]
Graphene-Si grating heterostructures, Multiple magnetic polaritons, Near-field thermal radiation, Surface plasmon polaritons
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-246435DOI: 10.1016/j.ijheatmasstransfer.2019.01.037ISI: 000462418300094Scopus ID: 2-s2.0-85061693692OAI: oai:DiVA.org:kth-246435DiVA, id: diva2:1300710
Note

QC 20190329

Available from: 2019-03-29 Created: 2019-03-29 Last updated: 2019-04-24Bibliographically approved

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