Zheng Q L, Wen L, Chen Q. Research progress of computational microspectrometer based on speckle inspection[J]. Opto-Electron Eng, 2021, 48(3): 200183. doi: 10.12086/oee.2021.200183
Citation: Zheng Q L, Wen L, Chen Q. Research progress of computational microspectrometer based on speckle inspection[J]. Opto-Electron Eng, 2021, 48(3): 200183. doi: 10.12086/oee.2021.200183

Research progress of computational microspectrometer based on speckle inspection

    Fund Project: National Key Research and Development Program of China (2019YFB2203402), National Natural Science Foundation of China (11774383, 11774099 and 11874029), Guangdong Science and Technology Program International Cooperation Program (2018A050506039), Guangdong Basic and Applied Basic Research Foundation (2020B1515020037), and Pearl River Talent Plan Program of Guangdong (2019QN01X120)
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  • Fast, accurate and nondestructive spectral analysis technique is important and widely used in the fields of scientific research, information, biomedical, pharmaceutical detection, agriculture, environment, and security. However, the existing spectroscopic analysis equipments are usually bulky and complex, which are difficult to adapt to portable application scenarios such as on-site rapid detection, light-load platform, etc. In recent years, miniature spectroscopic detection technology and equipment have received extensive attention, and have been rapidly developed, with significant advantages in size, weight, and power consumption. In particular, the computational spectral analysis technology based on the speckle detection can obtain high-precision spectral information by recording and analyzing the speckle pattern formed by the scattering element on the measured light. This paper will first introduce the related technical principles and technological developments, then analyze the existing techniques including the advantages and disadvantages, and finally discuss and summarize the future development direction and application prospects.
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  • Overview: Fast, accurate and nondestructive spectral analysis technique is important to differentiate matters and widely used in the fields of scientific research, information, biomedical, pharmaceutical detection, agriculture, environment, and security. The existing spectroscopic analysis equipments usually use individual optical elements such as gratings, prisms and interferometer to obtain spectral information, and therefore the whole system is usually bulky, complex and expensive, which are difficult to adapt to portable application scenarios such as on-site rapid detection, point-of-care diagnostics, and light-load platform in low-resource settings. It is not straight forward to minimize the conventional spectrometer without a loss of performance because the spectral resolution is usually associated with the length of light path. Novel mechanisms and advanced techniques are required to tackle this issue. With the rapid developments of the novel nanophotonic techniques and micro-nano fabrication methods, spectral analysis has been achieved on a single chip with decent spectral resolution, for example, quantum dot microspectrometer, photonic crystal microspectrometer, and so on, which shows great advantages in volume, weight, integration, cost, etc. In addition, combining such minimized spectrometers together with the cloud technology and big data technology is expected to significantly improve the efficiency of spectral information in collection, distribution and analysis, which is important for timely, accurate and portable applications. In particular, the computational spectral technology based on the speckle inspection can obtain high-resolution spectral information by recording and analyzing the speckle patterns formed by the light scattering process. In general, the speckle detection-based spectral analysis techniques are divided into two categories: the waveguide types and the normal incidence types. The waveguide types include multimode fibers, multimode waveguides, and in-plane scatters. Different modes have different propagation constants and thus different phase delay. Different scattering paths also result in different phase delay. The light interference therefore induces the generation of the wavelength-dependent speckles. The normal incidence type usually includes disordered micro-nano structures such as nanoparticles, micro-holes, and frosted glass. Similar optical interference phenomenon occurs and generates wavelength-dependent speckles. By initially calibrating the speckle generation structures by a series of monochromatic light and dealing the speckle with the compressive sensing algorithm, the spectral information of the target spectrum can be reconstructed. This paper will introduce the relevant technical principles and technical development status, analyze the existing technical performance, advantages and disadvantages, discuss and summarize the future development direction and application prospects.

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