Miniaturized spectrometers based on graded photonic crystal films

Author:

Yang Tao1,Aizaz Ahmed Mian1,Zhang Gongyuan1,Shi Yaqi1,Chen Yinpeng1,Cui Hao1,Sun Yijun1,Yu Hui2ORCID,Zhang Yiming3,Lv Zunfu3,Hu Bing1,Yang Zongyin1ORCID,Che Lufeng1

Affiliation:

1. Zhejiang University

2. Research Center of High Efficiency Computing System

3. Zhejiang A&F University

Abstract

Miniaturized spectrometers have become increasingly important in modern analytical and diagnostic applications due to their compact size, portability, and versatility. Despite the surge in innovative designs for miniaturized spectrometers, significant challenges persist, particularly concerning manufacturing cost and efficiency when devices become smaller. Here we introduce an ultracompact spectrometer design that is both cost-effective and highly efficient. The core dispersion element of this new design is a graded photonic crystal film, which is engineered by applying gradient stress during its fabrication. The film shows bandstop transmission spectral profiles, akin to a notch filter, enhancing light throughput compared to conventional narrowband filters. The spectral analysis, with a resolution of 5 nm and operating within the wavelength range of 450-650 nm, is conducted by reconstructing the spectrum from a series of such notch transmission profiles along the graded photonic crystal film, utilizing a sophisticated algorithm. This approach not only reduces manufacturing costs but also significantly improves the sensitivity (with a light throughput efficiency of 71.05%) and overall performance of the limitations of current technology, opening up new avenues for applications in diverse fields.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

The Leading Innovation and Entrepreneurship Team Project in Zhejiang

Cao Guangbiao High Science and Technology Foundation, Zhejiang University

Fundamental Research Funds for the Central Universities

Zhejiang University Education Foundation Global Partnership Fund

Ningbo Key Projects

Publisher

Optica Publishing Group

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