太赫兹立体相位光栅衍射特性分析 -

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太赫兹立体相位光栅衍射特性分析

杨秋杰^1,,
何志平^{1, 2,,},
糜忠良³

1.
中国科学院上海技术物理研究所，中国科学院空间主动光电重点实验室，上海 200083
2.
中国科学院大学，北京 100049
3.
上海市现场物证重点实验室，上海 200000

中图分类号:TP394.1; TH691.9
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出版历程
- 收稿日期:2019-07-10
- 修回日期:2019-08-10
- 刊出日期:2020-06-01

Diffraction characteristics analysis of multi-depth phase modulation grating in terahertz band

doi:10.3788/CO.2019-0147

1.
Key Laboratory of Space Active Opto-Electronics Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Shanghai Key Laboratory of Crime Scene Evidence, Shanghai 200000, China

Funds:Supported by the National Natural Science Foundation of China (No. 61905268); Natural Science Foundation of Shanghai Province (No. 18ZR1445500); the Innovation Project Fund of Shanghai Institute of Technical Physics (IPFSITP) (No. CX-158); the Opening Project of Shanghai Key Laboratory of Crime Scene Evidence (No. 2018XCWZK14)

More Information

Author Bio:
Yang Qiujie (1988—), male, born in Gongyi City, Henan province. Ph.D. He is now an assistant researcher at Shanghai Institute of Technical Physics, and mainly engaged in THz spectral imaging research. E-mail:yqj488112gxx@163.com
He Zhiping (1977—), male, born in Xinyu City, Jiangxi Province. Ph.D. He is now a researcher and doctoral supervisor of Shanghai Institute of Technical Physics. He is mainly engaged in the research of photoelectric detection and imaging, focusing on the spectral imaging detection technology oriented to lunar and deep space exploration applications and the spaceborne active and passive composite optical technology. E-mail:hzping@mail.sitp.ac.cn

Corresponding author:hzping@mail.sitp.ac.cn

摘要

摘要:针对太赫兹谱成像对宽光谱、高光能利用率、实时探测分光器件的需求，提出了一种太赫兹立体相位光栅（MPMG）分光器件。MPMG通过刻槽深度的变化引入光程差，实现对入射光的相位调制，从而使反射太赫兹波前的不同区域具有不同的相位信息，其零级衍射光具备分光能力。在分析MPMG衍射场光强分布的基础上，讨论了光栅参数对衍射场分布的影响，并通过实验验证了MPMG的衍射特性。结果表明，MPMG各光栅单元在0.5 THz、0.34 THz的衍射效率理论值与实测值相吻合，证明了MPMG的零级衍射光具备分光能力。
- 太赫兹/
- 立体相位光栅/
- 夫琅禾费衍射/
- 场分布
Abstract:To meet the requirements of terahertz spectral imaging for wide spectral range, high efficiency and real-time detection of spectrometers, a Multi-depth Phase Modulation Grating (MPMG) in terahertz band is proposed. The phase modulation of incident light is realized by introducing optical path difference resulted from the change of groove depth, so that different regions of reflecting terahertz wave front have different phase information. Based on the analysis of the intensity distribution of the diffraction field of the MPMG, the influence of grating parameters on the distribution of the diffraction field is discussed. The diffraction characteristics of the MPMG are verified by experiments. The experiment results indicate that the measurements of the 0th- and ±1st-order diffraction efficiency at 0.5 and 0.34 THz obtained by experiment and simulation are in good agreement. It suggests that 0th order diffraction of the MPMG has the ability of splitting light.
- THz/
- multi-depth phase modulation grating/
- fraunhofer diffraction/
- field distribution

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图 1MPMG示意图(a)一维MPMG，(b)二维MPMG(c)光栅单元

Figure 1.Schematic diagram of MPMG. (a) 1D MPMG, (b) 2D MPMG, (c) grating cell

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图 2(a) MPMG等效为平面透射光栅示意图 (b) MPMG衍射示意图

Figure 2.(a) Reflection grating simulated as a plane transmission grating; (b) MPMG diffraction diagram

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图 3不同相位调制下沿x轴方向的光强分布

Figure 3.Light intensity distributions along thexaxis under different phase modulation conditions

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图 4(a) 高功率辐射源系统；(b) 准直与发射系统；(c) 实验方案；(d) 一维MPMG；(e) 光栅测试系统；(f) 探测器照片

Figure 4.(a) High-power THz radiation source system. (b) Laser collimation and transmission system. (c) Schematic of experiment. (d) 1D MPMG. (e) Grating-testing system. (f) Photograph of the THz detector.

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图 5光栅单元0级和1级衍射效率的模拟和测试结果(a) 0.34 THz (b) 0.5 THz

Figure 5.Simulation and test results of 0th- and 1st-order diffraction efficiency for each grating cell at (a) 0.34 THz and (b) 0.5 THz

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表 1Parameters of 1D MPMG

Table 1.Parameters of 1D MPMG

Name of parameter	Value	Name of parameter	Value
N	8	n	5
w/mm	1	l/mm	40
ψ/(°)	0	θ/(°)	60
h/cm
h{1}	0.163 5	h{5}	0.817 5
h{2}	0.327 0	h{6}	0.981 0
h{3}	0.490 5	h{7}	1.144 5
h{4}	0.654 0	h{8}	1.308 0

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