9 November 2016 Hyperbolic phonon polaritons in hexagonal boron nitride (Conference Presentation)
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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).
Conference Presentation
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Siyuan Dai, Siyuan Dai, Qiong Ma, Qiong Ma, Zhe Fei, Zhe Fei, Mengkun Liu, Mengkun Liu, Michael D. Goldflam, Michael D. Goldflam, Trond Andersen, Trond Andersen, William Garnett, William Garnett, Will Regan, Will Regan, Martin Wagner, Martin Wagner, Alexander S. McLeod, Alexander S. McLeod, Alexandr Rodin, Alexandr Rodin, Shou-En Zhu, Shou-En Zhu, Kenji Watanabe, Kenji Watanabe, T. Taniguchi, T. Taniguchi, Gerado Dominguez, Gerado Dominguez, Mark Thiemens, Mark Thiemens, Antonio H. Castro Neto, Antonio H. Castro Neto, Guido C.A. M. Janssen, Guido C.A. M. Janssen, Alex Zettl, Alex Zettl, Fritz Keilmann, Fritz Keilmann, Pablo Jarillo-Herrero, Pablo Jarillo-Herrero, Michael M. Fogler, Michael M. Fogler, Dmitri N. Basov, Dmitri N. Basov, } "Hyperbolic phonon polaritons in hexagonal boron nitride (Conference Presentation)", Proc. SPIE 9918, Metamaterials, Metadevices, and Metasystems 2016, 99181Q (9 November 2016); doi: 10.1117/12.2236367; https://doi.org/10.1117/12.2236367
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