Diffractive Elements for Zero-Order Bessel Beam Generation With Application in the Terahertz Reflection Imaging
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TLDR
In this article, a novel diffractive elements are presented to produce zero-order Bessel beams in the terahertz (THz) band by using phase plates to change the direction of the incident Gaussian beam.Abstract:
Novel diffractive elements are presented to produce zero-order Bessel beams in the terahertz (THz) band. First, diffractive elements are designed as phase plates to change the direction of the incident Gaussian beam. Then, they are fabricated by the emerging three-dimensional printing technology. Last, zero-order Bessel beams are generated by the diffractive elements at 0.3 THz. To verify the feasibility of this approach, the generated zero-order Bessel beams are monitored and compared with the ones generated by the axicons. The comparison confirms that the diffractive elements can produce Bessel beam effectively and efficiently. In addition, the diffractive elements are applied to introduce zero-order Bessel beam to a THz reflection imaging system. A resolution test phantom is imaged by the THz reflection imaging system with zero-order Bessel beam and a conventional THz reflection imaging system. The results indicate that the THz reflection imaging system with Bessel beam offers a significantly extended depth of field and high anti-interference capability.read more
Citations
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The Magic of Optics-An Overview of Recent Advanced Terahertz Diffractive Optical Elements.
TL;DR: An overview of the recently invented terahertz optical structures based on diffraction design is presented in this article, where the basic concepts of structure design together with various functioning of such elements are described.
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Recent Advances in Terahertz Time-Domain Spectroscopy and Imaging Techniques for Automation in Agriculture and Food Sector
TL;DR: In this article, the principle and instrumentation of terahertz spectroscopy are discussed and focuses on the recent advances in THz technology used in water monitoring, soil sensing, classification of seeds, varieties/origin discrimination, residue detection, microbes, toxin and food spoilage detection, food adulteration identification, and foreign particles inspection in the food and agriculture sector.
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Generation of a meter-scale THz diffraction-free beam based on multiple cascaded lens-axicon doublets: detailed analysis and experimental demonstration.
TL;DR: Results show that the zero-radial-spatial-frequency component plays a key role during the generation process of the third beam, and the intensities of this component are enhanced with the increase in the number of lens-axicon doublets, making the diffraction-free length longer.
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Diffraction-Free THz Sheet and Its Application on THz Imaging System
TL;DR: In this article, a simple three-dimensional printed element, i.e., ridge prism, was used to generate a diffraction-free structured terahertz (THz) beam in free space.
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Synthesis of Bessel Beam Using Time-Reversal Method Incorporating Metasurface
Qing-Song Jia,Shuai Ding,Hui-Bing Dong,Xu Han,Zhao-Jun Zhu,Bing-Zhong Wang,Yong Mao Huang,Maurizio Bozzi +7 more
TL;DR: In this article, a synthesis and implementation method for generating Bessel beams based on time-reversal theory incorporating electromagnetic (EM) meta-lens is proposed, which can be used for the application of Bessel beam in microwave communications, and it can broaden the application scope of non-diffracting beams.
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