Subdiffractional focusing and guiding of polaritonic rays in a natural hyperbolic material

S. Dai; Q. Ma; T. Andersen; A. S. Mcleod; Z. Fei; M. K. Liu; M. Wagner; K. Watanabe; T. Taniguchi; M. Thiemens; F. Keilmann; P. Jarillo-Herrero; M. M. Fogler; D. N. Basov

doi:10.1038/ncomms7963

論文 Subdiffractional focusing and guiding of polaritonic rays in a natural hyperbolic material

S. Dai ; Q. Ma ; T. Andersen ; A. S. Mcleod ; Z. Fei ; M. K. Liu ; M. Wagner ; K. Watanabe (National Institute for Materials Science) ; T. Taniguchi (National Institute for Materials Science) ; M. Thiemens ; F. Keilmann ; P. Jarillo-Herrero ; M. M. Fogler ; D. N. Basov

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S. Dai, Q. Ma, T. Andersen, A. S. Mcleod, Z. Fei, M. K. Liu, M. Wagner, K. Watanabe, T. Taniguchi, M. Thiemens, F. Keilmann, P. Jarillo-Herrero, M. M. Fogler, D. N. Basov. Subdiffractional focusing and guiding of polaritonic rays in a natural hyperbolic material. Nature Communications. 2015, 6 (1), 6963. https://doi.org/10.1038/ncomms7963

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We report nano-imaging experiments demonstrating that crystals of hBN, a natural mid-infrared hyperbolic material , can act as a “hyperlens” and as a multi-mode waveguide. The lensing is manifested by subdiffractional focusing of phonon-polaritons launched by metallic disks underneath the hBN crystal. The waveguiding is revealed through the modal analysis of the periodic patterns observed around such launchers and near the sample edges.

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