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Proceedings Paper

Efficient spectral confocal meta-lens in the near infrared
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Paper Abstract

Spectral confocal technology is an important three-dimensional measurement technology with high accuracy and non-contact; however, traditional spectral confocal system usually consists of prisons and several lens whose volume and weight is enormous and heavy, besides, due to the chromatic aberration characteristics of ordinary optical lenses, it is difficult to perfectly focus light in a wide bandwidth. Meta-surfaces are expected to realize the miniaturization of conventional optical element due to its superb abilities of controlling phase and amplitude of wavefront of incident at subwavelength scale, and in this paper, an efficient spectral confocal meta-lens (ESCM) working in the near infrared spectrum (1300nm-2000nm) is proposed and numerically demonstrated. ESCM can focus incident light at different focal lengths from 16.7 to 24.5μm along a perpendicular off-axis focal plane with NA varying from 0.385 to 0.530. The meta-lens consists of a group of Si nanofins providing high polarization conversion efficiency lager than 50%, and the phase required for focusing incident light is well rebuilt by the resonant phase which is proportional to the frequency and the wavelength-independent geometric phase, PB phase. Such dispersive components can also be used in implements requiring dispersive device such as spectrometers.

Paper Details

Date Published: 18 November 2019
PDF: 11 pages
Proc. SPIE 11187, Optoelectronic Imaging and Multimedia Technology VI, 111871X (18 November 2019); doi: 10.1117/12.2537309
Show Author Affiliations
Yan Sun, Zhejiang Univ. (China)
Chang Wang, Zhejiang Univ. (China)
Xiao Tao, Zhejiang Univ. (China)
Wan Liu, Zhejiang Univ. (China)
Lin Yang, Zhejiang Univ. (China)
Xucheng Wang, Zhejiang Univ. (China)
Yixing Chen, Nanjing Smartvison Electronic Co.,Ltd. (China)
Rengmao Wu, Zhejiang Univ. (China)
Zhenrong Zheng, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 11187:
Optoelectronic Imaging and Multimedia Technology VI
Qionghai Dai; Tsutomu Shimura; Zhenrong Zheng, Editor(s)

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