首页|Terahertz quasi-perfect vortex beam with integer-order and fractional-order generated by spiral spherical harmonic axicon
Terahertz quasi-perfect vortex beam with integer-order and fractional-order generated by spiral spherical harmonic axicon
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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.
terahertzspiral spherical harmonic axiconquasi-perfect vortex beamtopological charge number
涂思语、刘德峰、刘劲松、杨振刚、王可嘉
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Wuhan National Laboratory for Optoelectronics,School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China
AVIC Beijing Changcheng Aeronautical Measurement and Control Technology Research Institute,Beijing 101111,China
Fundamental Research Funds for the Central Universities,China
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