中国物理B ›› 2017, Vol. 26 ›› Issue (12): 124203-124203.doi: 10.1088/1674-1056/26/12/124203

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

High efficiency terahertz diffraction grating with trapezoidal elements

Yin-Zhong Wu(巫殷忠), Quan-Pin Fan(范全平), Qiang-Qiang Zhang(张强强), Lai Wei(魏来), Yong Chen(陈勇), Zu-Hua Yang(杨祖华), Lei-Feng Cao(曹磊峰)   

  1. 1. Science and Technology on Plasma Physics Laboratory, China Academy of Engineering Physics, Mianyang 621900, China;
    2. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
  • 收稿日期:2017-05-19 修回日期:2017-09-01 出版日期:2017-12-05 发布日期:2017-12-05
  • 通讯作者: Zu-Hua Yang E-mail:yangzuhua@caep.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFB05033) and the National Science Instruments Major Project of China (Grant No. 2012YQ130125).

High efficiency terahertz diffraction grating with trapezoidal elements

Yin-Zhong Wu(巫殷忠)1,2, Quan-Pin Fan(范全平)2, Qiang-Qiang Zhang(张强强)2, Lai Wei(魏来)1,2, Yong Chen(陈勇)2, Zu-Hua Yang(杨祖华)2, Lei-Feng Cao(曹磊峰)1,2   

  1. 1. Science and Technology on Plasma Physics Laboratory, China Academy of Engineering Physics, Mianyang 621900, China;
    2. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
  • Received:2017-05-19 Revised:2017-09-01 Online:2017-12-05 Published:2017-12-05
  • Contact: Zu-Hua Yang E-mail:yangzuhua@caep.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFB05033) and the National Science Instruments Major Project of China (Grant No. 2012YQ130125).

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摘要： A newly designed grating used in terahertz region is proposed, which is composed of the trapezoidal elements repeated successively along one dimension of the substrate, and uniform interval (the grating period) repeated along the other dimension. The transmission of the grating owns a designable trapezoidal profile dependent on the geometric dimensions of the element. The far-field diffraction patterns of a designed grating at incident broadband terahertz frequencies, with element dimensions of upper, lower side and period of 50, 250, and 300 μm, respectively, are simulated by the scalar diffraction theory. The simulation results indicate that the terahertz grating exhibits a property of single-order diffraction, and the diffraction efficiency of the first order reaches 6.6%, exceeding that of a traditional sinusoidal amplitude grating with identical period and duty cycle. Owing to the regular architecture and the high single-order diffraction efficiency, the grating is easy to fabricate and shows great potential applications in single-shot spectral measurements of weak broadband terahertz pulse.

关键词: grating, terahertz, trapezoidal element, high efficiency

Abstract: A newly designed grating used in terahertz region is proposed, which is composed of the trapezoidal elements repeated successively along one dimension of the substrate, and uniform interval (the grating period) repeated along the other dimension. The transmission of the grating owns a designable trapezoidal profile dependent on the geometric dimensions of the element. The far-field diffraction patterns of a designed grating at incident broadband terahertz frequencies, with element dimensions of upper, lower side and period of 50, 250, and 300 μm, respectively, are simulated by the scalar diffraction theory. The simulation results indicate that the terahertz grating exhibits a property of single-order diffraction, and the diffraction efficiency of the first order reaches 6.6%, exceeding that of a traditional sinusoidal amplitude grating with identical period and duty cycle. Owing to the regular architecture and the high single-order diffraction efficiency, the grating is easy to fabricate and shows great potential applications in single-shot spectral measurements of weak broadband terahertz pulse.

Key words: grating, terahertz, trapezoidal element, high efficiency

中图分类号:  (Diffraction and scattering)

  • 42.25.Fx
07.57.Pt (Submillimeter wave, microwave and radiowave spectrometers; magnetic resonance spectrometers, auxiliary equipment, and techniques) 07.57.Ty (Infrared spectrometers, auxiliary equipment, and techniques)