Design of wide field of view and broad spectrum objective system for terahertz imaging

Xiaogang Chen; Youping Huang; Shuyan Huang; Hao Zhang

doi:10.1117/12.2652307

15 December 2022 Design of wide field of view and broad spectrum objective system for terahertz imaging

Xiaogang Chen, Youping Huang, Shuyan Huang, Hao Zhang

Proceedings Volume 12478, Thirteenth International Conference on Information Optics and Photonics (CIOP 2022); 1247816 (2022) https://doi.org/10.1117/12.2652307
Event: Thirteenth International Conference on Information Optics and Photonics (CIOP 2022), 2022, Xi'an, China

Abstract

Terahertz (THz) wave has great potential applications in the fields of security, material, biomedicine and nondestructive testing, due to its low energy, high penetrability, nondestructive property and fingerprint characteristics. In this paper, a high-performance objective system was presented and designed for THz camera. The THz objective system has an effective focal length of 39.5 mm, a F-number of 0.9, a full field angle of 24°, and a working band covering 70 - 200 μm (frequency range from 1.5 to 4.28 THz). In the system, a coaxial structure consisted of three spherical lens and a piece of aspherical lens was used. The design result shown that the root mean square radius (RMS Radius) of the sport diagrams were basically within the airy disk radius. At a cut-off frequency of 5 lp/mm, the modulation transfer function (MTF) values in the full field of view were above 0.22, which was close to the diffraction limited curve. In summary, the designed objective system has good imaging quality and high resolution, which can meet the performance requirements of large-field THz imaging systems, and has good application prospects in THz microscopic imaging.

Citation Download Citation

Xiaogang Chen, Youping Huang, Shuyan Huang, and Hao Zhang "Design of wide field of view and broad spectrum objective system for terahertz imaging", Proc. SPIE 12478, Thirteenth International Conference on Information Optics and Photonics (CIOP 2022), 1247816 (15 December 2022); https://doi.org/10.1117/12.2652307

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