Design and fabrication of a variable-line-space grating surface for a Fresnel-grating lens based miniature spectrometer

Menglin Geng; Qian Zhou; Xinghui Li; Haiou Lu; Weiqi Wang; Yixin Liu; Kai Ni; Lin Hui

doi:10.1117/12.2500950

2 November 2018 Design and fabrication of a variable-line-space grating surface for a Fresnel-grating lens based miniature spectrometer

Menglin Geng, Qian Zhou, Xinghui Li, Haiou Lu, Weiqi Wang, Yixin Liu, Kai Ni, Lin Hui

Author Affiliations +

Proceedings Volume 10818, Holography, Diffractive Optics, and Applications VIII; 108181X (2018) https://doi.org/10.1117/12.2500950
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

A new type of plane optical lens, the Fresnel-grating lens with variable-line-space grating surface based on dual pointsource holographic technique, is demonstrated, optimized and fabricated in this research. The Fresnel-grating lens integrates the function of a diffraction grating and a Fresnel lens, and provides collimation, focusing as well as dispersion effects at the same time, which simplifies the optical structure and fits perfectly for a miniature spectrometer. The variable-line-space grating surface can enhance the modulation ability of the spectrometer system A mathematical model is established based on the least wave-change principle and the system parameters are optimized using optics simulation software ZEMAX. The fabrication procedures for the Fresnel-grating lens with soft lithography are illustrated in detail, and a dual-point holographic exposure optical path to form the grating surface as well as a mold to cast the Fresnel-grating lens are constructed. Samples of Fresnel-grating lens with the size of 16mm×16mm×5mm are fabricated and preliminarily tested. The period on the central part of fabricated grating surface is 926±2nm and the results show great consistency with the simulation. With further testing in the spectrometer system, the Fresnel-grating lens with a variable-line-space grating surface holds considerable potential in the miniature spectrometer area.

Citation Download Citation

Menglin Geng, Qian Zhou, Xinghui Li, Haiou Lu, Weiqi Wang, Yixin Liu, Kai Ni, and Lin Hui "Design and fabrication of a variable-line-space grating surface for a Fresnel-grating lens based miniature spectrometer", Proc. SPIE 10818, Holography, Diffractive Optics, and Applications VIII, 108181X (2 November 2018); https://doi.org/10.1117/12.2500950

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