Chinese Optics Letters, 2020, 18 (6): 063602, Published Online: May. 13, 2020  

Broadband transverse displacement sensing of silicon hollow nanodisk under focused radial polarization illumination in the near-infrared region Download: 800次

Author Affiliations
1 Institute of Modern Optics, Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Nankai University, Tianjin 300350, China
2 School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
Abstract
Broadband transverse displacement sensing by exploiting the interaction of a focused radially polarized beam with a silicon hollow nanodisk is proposed. The multipolar decomposition analysis indicates that the interference between a longitudinal total electric dipole (TED) moment and a lateral magnetic dipole (MD) moment is dominant in the far-field transverse scattering in the near-infrared region. Within a broadband wavelength range with the width of 155 nm, the longitudinal TED is almost in phase with the lateral MD, and then broadband position sensing based on the sensitivity of scattering directivity to transverse displacement can be achieved.

Jianxin Wang, Xianghui Wang, Ming Zeng. Broadband transverse displacement sensing of silicon hollow nanodisk under focused radial polarization illumination in the near-infrared region[J]. Chinese Optics Letters, 2020, 18(6): 063602.

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