| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Terahertz quasi-perfect vortex beam with integer-order and fractional-order generated by spiral spherical harmonic axicon |
| Si-Yu Tu(涂思语)1, De-Feng Liu(刘德峰)2, Jin-Song Liu(刘劲松)1, Zhen-Gang Yang(杨振刚)1, and Ke-Jia Wang(王可嘉)1,† |
1 Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China;
2 AVIC Beijing Changcheng Aeronautical Measurement and Control Technology Research Institute, Beijing 101111, China |
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Abstract We propose a new method to generate terahertz perfect vortex beam with integer-order and fractional-order. A new optical diffractive element composed of the phase combination of a spherical harmonic axicon and a spiral phase plate is designed and called spiral spherical harmonic axicon. A terahertz Gaussian beam passes through the spiral spherical harmonic axicon to generate a terahertz vortex beam. When only the topological charge number carried by spiral spherical harmonic axicon increases, the ring radius of terahertz vortex beam increases slightly, so the beam is shaped into a terahertz quasi-perfect vortex beam. Importantly, the terahertz quasi-perfect vortex beam can carry not only integer-order topological charge number but also fractional-order topological charge number. This is the first time that vortex beam and quasi-perfect vortex beam with fractional-order have been successfully realized in terahertz domain and experiment.
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Received: 01 August 2023
Revised: 31 August 2023
Accepted manuscript online: 13 September 2023
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PACS:
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42.25.-p
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(Wave optics)
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04.30.-w
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(Gravitational waves)
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07.57.-c
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(Infrared, submillimeter wave, microwave and radiowave instruments and equipment)
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| Fund: Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No. 2017KFYXJJ029). |
Corresponding Authors:
Ke-Jia Wang
E-mail: wkjtode@sina.com
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Cite this article:
Si-Yu Tu(涂思语), De-Feng Liu(刘德峰), Jin-Song Liu(刘劲松), Zhen-Gang Yang(杨振刚), and Ke-Jia Wang(王可嘉) Terahertz quasi-perfect vortex beam with integer-order and fractional-order generated by spiral spherical harmonic axicon 2024 Chin. Phys. B 33 014211
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