Coupling between hyperbolic phonon polaritons excited in two ultrathin hBN sheets

Coupling between hyperbolic phonon polaritons excited in two ultrathin hBN sheets Xiaohu Wu, Chengshuai Su, Kezhang Shi, Feng Wu, and Ceji Fu Shandong Institute of Advanced Technology, Jinan 250100, China LTCS and Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, China Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310058, China School of Optoelectronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510665, China Corresponding author: xiaohu.wu@iat.cn In this work, the hyperbolic phonon polaritons (HPPs) in ultrathin hBN sheets are numerically studied. The dispersion relation and distribution of electric field are calculated to confirm the excitation of HPPs. Besides, the coupling effect between HPPs of two ultrathin hBN sheets are investigated. When the distance between two hBN sheets are smaller than the propagation length of the HPPs in the air, the HPPs can be strongly coupled. Therefore, the photon tunneling probability can be greatly enhanced. The split of the HPPs is similar to that of the surface waves, and such phenomenon is well explained in this work. We believe that this work will deepen our understanding of the HPPs in ultrathin hyperbolic materials. In addition, the knowledge about the HPPs will help us understand the near-field radiative heat transfer between hyperbolic materials.

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