• Acta Photonica Sinica
  • Vol. 52, Issue 1, 0111001 (2023)
Qifan ZHU1、2, Yi CAI1、2, Xuanke ZENG1、2, Hu LONG1、2, Yongle ZHU1、2, Liangwei ZENG1、2, Jingzhen LI1、2、*, and Xiaowei LU1、2、**
Author Affiliations
  • 1Shenzhen Key Laboratory of Micro-nano Photonic Information Technology,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,China
  • 2Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,China
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    DOI: 10.3788/gzxb20235201.0111001 Cite this Article
    Qifan ZHU, Yi CAI, Xuanke ZENG, Hu LONG, Yongle ZHU, Liangwei ZENG, Jingzhen LI, Xiaowei LU. Bionic Ultrafast Imaging for Multi-FOV and Wide Time Range[J]. Acta Photonica Sinica, 2023, 52(1): 0111001 Copy Citation Text show less

    Abstract

    The existing ultrafast imaging systems can record dynamic events on the femtosecond time scale, but they have the problems of complex components, large systems, limited field of view and time range. The single-shot ultrafast imaging technologies by direct imaging can realize the recording of dynamic images through spatial separation of temporal images. However, their detection systems have the problem of complex structures. The ultrafast imaging system combined with algorithms simplifies the detection structure, but there are some problems, such as complex framing system, limited time range and field of view. This paper proposes a single-shot ultrafast imaging method inspired by the eyes of mantis shrimp, which can be applied to multiple fields of view and wide time range with a compact structure. In this bionic system, the structure light illumination principle is inspired by the orthogonal microvillus arrays, the ommatidium system optical path leads to the optical path of mantis shrimps' ommatidium, and the optical path of compound system is inspired by the compound eye of mantis shrimp, which expands the field of view. Single-shot bionic ultrafast imaging uses a step reflection array to generate sequential pulses of different frequencies and directions and interference fringe structured light illumination to divide the sequential images. It realizes images compressed in a single detector and reconstruction of the continuous images based on the spatial angle division multiplexing algorithm. The bionic mantis shrimp structure can realize single-shot ultrafast imaging, while the compound eye structure is composed of ommatidium systems splice, which can break through the limit size of the field of view to achieve a large field of view. The feasibility of interference fringe multiplexing is verified by static test, and Zemax establishes an optical model to realize the sequential image restoration of ommatidium and compound eye system of 8 images. The framing time is discussed and verified. FDTD simulation is used to verify the feasibility of generating sequential pulses by the step array of mirrors. The framing time can be changed by adjusting the height of adjacent steps, and achieving framing times of 78 fs and 1 ps, and the sequential pulses are not widened compared with the incident pulses. By analyzing the factors affecting the framing time of the bionic single-shot ultrafast imaging system, it can be concluded that the framing time mainly depends on the width of the sequential pulses, so its photographic frequency can reach 1013 frame/s. Besides, the time delay structure and imaging structure are independent. Dispersion element and narrowband filter array can be used instead of mirror arrays to realize time delay. As the dispersion elements can be glass columns, prism pairs, grating pairs, and optical fibers, the bionic system can expand femtosecond pulses to hundreds of femtosecond, picosecond, or nanosecond time scales. Hence the bionic ultrafast imaging system enables the recording of dynamic events on femtosecond, picosecond, or nanosecond time scales. The influence factors of the spatial resolution are then further analyzed. The optical system can achieve high spatial resolution, which can reach the pixel scale of the detector. Furthermore, it can also obtain high-quality restored images, and its intrinsic spatial resolution can theoretically reach 80.6 lp/mm. The bionic system can be used to detect various fields of view by adjusting the focal length of each lens. Hence, it can cover various fields of view. In conclusion, single-shot bionic ultrafast imaging can be applied to various sizes of the field of view in theory, and the framing rate can reach 1.2×1013 frame/s in simulation experiment. Single-shot bionic ultrafast imaging provides the possibility for detecting a large range of transient group events, such as light propagation in the scattering media, random motion. Its compact structure lays a foundation for miniaturization and lightweight of ultrafast imaging instruments.
    Qifan ZHU, Yi CAI, Xuanke ZENG, Hu LONG, Yongle ZHU, Liangwei ZENG, Jingzhen LI, Xiaowei LU. Bionic Ultrafast Imaging for Multi-FOV and Wide Time Range[J]. Acta Photonica Sinica, 2023, 52(1): 0111001
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