3 years ago

Efficiency of Launching Highly Confined Polaritons by Infrared Light Incident on a Hyperbolic Material

Efficiency of Launching Highly Confined Polaritons by Infrared Light Incident on a Hyperbolic Material
Trond I. Andersen, Alex McLeod, Zhe Fei, Jeremy Rosenfeld, Michael M. Fogler, Takashi Taniguchi, Pablo Jarillo-Herrero, Kenji Watanabe, Yafang Yang, Fritz Keilmann, Mark Thiemens, D. N. Basov, Siyuan Dai, Qiong Ma, Yinming Shao, Zhiyuan Sun, Mengkun Liu, Michael D. Goldflam
We investigated phonon–polaritons in hexagonal boron nitride—a naturally hyperbolic van der Waals material—by means of the scattering-type scanning near-field optical microscopy. Real-space nanoimages we have obtained detail how the polaritons are launched when the light incident on a thin hexagonal boron nitride slab is scattered by various intrinsic and extrinsic inhomogeneities, including sample edges, metallic nanodisks deposited on its top surface, random defects, and surface impurities. The scanned tip of the near-field microscope is itself a polariton launcher whose efficiency proves to be superior to all the other types of polariton launchers we studied. Our work may inform future development of polaritonic nanodevices as well as fundamental studies of collective modes in van der Waals materials.

Publisher URL: http://dx.doi.org/10.1021/acs.nanolett.7b01587

DOI: 10.1021/acs.nanolett.7b01587

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