A New Type of Combined Axicon for Generating Non-Diffracting Bessel Beams

Liang, 马亮 Ma; Fengtie, 吴逢铁 Wu; Qilu, 黄启禄 Huang

doi:10.3788/aos20103008.2417

Cited by 2 publications

(1 citation statement)

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“…In the past decades, alternative strategies have been made to pursuit ultralong non-diffraction Bessel beams, including alternative materials for axicons [11] , 3D printing for axicon fabrication [10,12] , the modification of axicon structures [13] , sheet-like structures [14] , as well as negative axicons [15] , the utilization of multi-lens combinations [16,17] . Unfortunately, both the elusive equilibrium between non-diffraction length as well as optical intensity and the balance between the substantial delivery distance as well as the non-diffraction length are still not well investigated and solved.…”

Section: Introductionmentioning

confidence: 99%

Ultra-long THz Bessel beams based on an axicon system

Chang,

Chen,

Zhang

et al. 2023

Infrared, Millimeter-Wave, and Terahertz Technologies X

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In terahertz (THz) range, ultra-long non-diffraction Bessel beams have been theoretically and experimentally developed and consequently achieved significant advancements. Nevertheless, the balance between non-diffraction length and optical intensity is restricted and their applications have been limited in part due to their complication in access and operation, loss of energy and spectral bandwidth. In this work, a composite system composed of multiple lenses and axicon is presented to engender ultra-long terahertz Bessel beams. By manipulating the spatial relationships between various THz components, the delivery distance and non-diffraction length surpass 40cm and 2m respectively.

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Section: Introductionmentioning

confidence: 99%

Ultra-long THz Bessel beams based on an axicon system

Chang,

Chen,

Zhang

et al. 2023

Infrared, Millimeter-Wave, and Terahertz Technologies X

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Light rays in Fourier domain

Zhang¹,

Meng²,

Zhang³

et al. 2019

Acta Phys. Sin.

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Establishing a universal model to characterize the relationship between light rays and optical waves is of great significance in optics. The ray model provides us with an intuitive way to study the propagation of beams as well as their interaction between objects. Traditional ray model is based on the normal of a beam wave front. The normal vector is defined as the direction of ray. However, it fails to describe the relationship between light ray and optical wave in the neighborhood of focus or caustic lines/surface since light ray in those regions are no longer perpendicular to the wavefront. In this work, the ray model of a light beam is built according to its Fourier angular spectrum, where the positions of rays can be determined by the gradient of the phase of the Fourier angular spectrum. On the other hand, the Fourier angular spectrum of a light beam can be reconstructed through the ray model. Using Fourier angular spectra, we construct the ray model of two typical beams including the Airy beam and the Cusp beam. It is hard to construct ray model directly from the optical field of these beams. In this ray model, the information about ray including direction and position involves the propagation properties of light beams such as self-accelerating. In addition, we demonstrate that the optical field of the focused plane wave can be reconstructed by the ray model in Fourier regime, and the optical field in spatial domain can be obtained by inverse Fourier transform. Simulation results are consistent with the results from Debye’s method. Finally, the high-dimensional ray model of light beams is elaborated in both spatial and spectral regime. Combined with focused plane wave, Airy beam and rays in quadratic gradient-index waveguide, our results show that the ray model actually carries the information about optical field in both spatial and Fourier domain. Actually, the traditional ray model is just a spatial projection of the high-dimensional ray model. Hence, when traditional ray model fails at the focus or caustic lines/surface, it is able to obtain the spectrum of the corresponding optical field from the Fourier domain, and then obtain the field distribution in spatial domain by inverse Fourier transform.

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A New Type of Combined Axicon for Generating Non-Diffracting Bessel Beams

Cited by 2 publications

References 0 publications

Ultra-long THz Bessel beams based on an axicon system

Ultra-long THz Bessel beams based on an axicon system

Light rays in Fourier domain

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