Efficient spectral confocal meta-lens in the near infrared

Yan Sun; Chang Wang; Xiao Tao; Wan Liu; Lin Yang; Xucheng Wang; Yixing Chen; Rengmao Wu; Zhenrong Zheng

doi:10.1117/12.2537309

18 November 2019 Efficient spectral confocal meta-lens in the near infrared

Yan Sun, Chang Wang, Xiao Tao, Wan Liu, Lin Yang, Xucheng Wang, Yixing Chen, Rengmao Wu, Zhenrong Zheng

Proceedings Volume 11187, Optoelectronic Imaging and Multimedia Technology VI; 111871X (2019) https://doi.org/10.1117/12.2537309
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

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.

Citation Download Citation

Yan Sun, Chang Wang, Xiao Tao, Wan Liu, Lin Yang, Xucheng Wang, Yixing Chen, Rengmao Wu, and Zhenrong Zheng "Efficient spectral confocal meta-lens in the near infrared", Proc. SPIE 11187, Optoelectronic Imaging and Multimedia Technology VI, 111871X (18 November 2019); https://doi.org/10.1117/12.2537309

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KEYWORDS

Confocal microscopy

Polarization

Finite-difference time-domain method

Near infrared

Phase compensation

Spectrometers

Chromatic aberrations

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