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9 November 2016 Hyperbolic phonon polaritons in hexagonal boron nitride (Conference Presentation)
Siyuan Dai, Qiong Ma, Zhe Fei, Mengkun Liu, Michael D. Goldflam, Trond Andersen, William Garnett, Will Regan, Martin Wagner, Alexander S. McLeod, Alexandr Rodin, Shou-En Zhu, Kenji Watanabe, T. Taniguchi, Gerado Dominguez, Mark Thiemens, Antonio H. Castro Neto, Guido C.A. M. Janssen, Alex Zettl, Fritz Keilmann, Pablo Jarillo-Herrero, Michael M. Fogler, Dmitri N. Basov
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Proceedings Volume 9918, Metamaterials, Metadevices, and Metasystems 2016; 99181Q (2016) https://doi.org/10.1117/12.2236367
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States
Abstract
Uniaxial materials whose axial and tangential permittivities have opposite signs are referred to as indefinite or hyperbolic media. While hyperbolic responses are normally achieved with metamaterials, hexagonal boron nitride (hBN) naturally possesses this property due to the anisotropic phonons in the mid-infrared. Using scattering-type scanning near-field optical microscopy, we studied polaritonic phenomena in hBN. We performed infrared nano-imaging of highly confined and low-loss hyperbolic phonon polaritons in hBN. The polariton wavelength was shown to be governed by the hBN thickness according to a linear law persisting down to few atomic layers [1]. Additionally, we carried out the modification of hyperbolic response in meta-structures comprised of a mononlayer graphene deposited on hBN [2]. Electrostatic gating of the top graphene layer allows for the modification of wavelength and intensity of hyperbolic phonon polaritons in bulk hBN. The physics of the modification originates from the plasmon-phonon coupling in the hyperbolic medium. Furthermore, we demonstrated the “hyperlens” for subdiffractional focusing and imaging using a slab of hBN [3]. References [1] S. Dai et al., Science, 343, 1125 (2014). [2] S. Dai et al., Nature Nanotechnology, 10, 682 (2015). [3] S. Dai et al., Nature Communications, 6, 6963 (2015).
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Siyuan Dai, Qiong Ma, Zhe Fei, Mengkun Liu, Michael D. Goldflam, Trond Andersen, William Garnett, Will Regan, Martin Wagner, Alexander S. McLeod, Alexandr Rodin, Shou-En Zhu, Kenji Watanabe, T. Taniguchi, Gerado Dominguez, Mark Thiemens, Antonio H. Castro Neto, Guido C.A. M. Janssen, Alex Zettl, Fritz Keilmann, Pablo Jarillo-Herrero, Michael M. Fogler, and Dmitri N. Basov "Hyperbolic phonon polaritons in hexagonal boron nitride (Conference Presentation)", Proc. SPIE 9918, Metamaterials, Metadevices, and Metasystems 2016, 99181Q (9 November 2016); https://doi.org/10.1117/12.2236367
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KEYWORDS
Phonons
Polaritons
Boron
Graphene
Near field scanning optical microscopy
Infrared radiation
Metamaterials
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