Terahertz tight-focused Bessel beam generation and point-to-point focusing based on nonlocal diffraction engineering

Cheng, Jie; Yang, Yang; Fan, Fei; Wang, Xianghui; Chang, Shengjiang

doi:10.1364/ol.460747

Cited by 4 publications

(4 citation statements)

References 25 publications

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“…The polarization characteristics of BGb generated by the integrated photonic chip are entirely different from those of Bessel beams in the previous works [6][7][8][9][10][11][12][13][14] (Supplementary Table S1). Here, a first-order vector beam with polarization singularity centered at the optical field is generated.…”

Section: Bgb Generated By the Integrated Photonic Chipmentioning

confidence: 58%

“…The integrated generation of the Bessel beam can provide a simple structure for effectively detecting light beams blocked by obstacles. However, the previously reported Bessel beam generator [10][11][12][13][14] cannot be used in long-distance scenes because of its short propagation distance. So far, there have seldom been reports on the rotation-speed measurement using the BGb generated on a chip.…”

Section: Measurement Of Rotation Speed and Distance Of A Spinning Obj...mentioning

confidence: 99%

“…It hinders the Bessel beam generation system from being applied in practical applications. Recently, several compact systems have been proposed to generate Bessel beams by using photonic integrated circuits (PICs) 10 , metasurfaces 11,12 , integrated waveguide 13 , and 3D-printed fiber 14 . The methods based on PICs only generate a quasi-1D Bessel beam.…”

Section: Introductionmentioning

confidence: 99%

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On-chip generation of Bessel–Gaussian beam via concentrically distributed grating arrays for long-range sensing

Zhi

Xie

et al. 2023

Light Sci Appl

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Bessel beam featured with self-healing is essential to the optical sensing applications in the obstacle scattering environment. Integrated on-chip generation of the Bessel beam outperforms the conventional structure by small size, robustness, and alignment-free scheme. However, the maximum propagation distance (Zmax) provided by the existing approaches cannot support long-range sensing, and thus, it restricts its potential applications. In this work, we propose an integrated silicon photonic chip with unique structures featured with concentrically distributed grating arrays to generate the Bessel–Gaussian beam with a long propagation distance. The spot with the Bessel function profile is measured at 10.24 m without optical lenses, and the photonic chip’s operation wavelength can be continuously performed from 1500 to 1630 nm. To demonstrate the functionality of the generated Bessel–Gaussian beam, we also experimentally measure the rotation speeds of a spinning object via the rotational Doppler Effect and the distance through the phase laser ranging principle. The maximum error of the rotation speed in this experiment is measured to be 0.05%, indicating the minimum error in the current reports. By the compact size, low cost, and mass production potential of the integrated process, our approach is promising to readily enable the Bessel–Gaussian beam in widespread optical communication and micro-manipulation applications.

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Section: Bgb Generated By the Integrated Photonic Chipmentioning

confidence: 58%

Section: Measurement Of Rotation Speed and Distance Of A Spinning Obj...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On-chip generation of Bessel–Gaussian beam via concentrically distributed grating arrays for long-range sensing

Zhi

Xie

et al. 2023

Light Sci Appl

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“…Researchers use the combination of solid and complementary hollow dielectric units combinations or sandwich units to realize the THz achromatic metalens [19][20][21] . Yang et al realized a THz metalens with subwavelength resolution imaging over a 9.1λ long distance based on the nonlocal diffraction engineering [22] . Xiao et al proposed a THz metalens with an adjustable focal length of over 100 μm at 1.8-2.2 THz [23] .…”

Section: Introductionmentioning

confidence: 99%

Terahertz wide-angle metalens with nearly ideal object-image relation

Wang,

Cheng,

et al. 2024

Chin. Opt. Lett.

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Metalenses are essential components in terahertz imaging systems. However, without careful design, they show limited field of view and their practical applications are hindered. Here, a wide-angle metalens is proposed whose structure is optimized for focusing within the incident angles of ±25°. Simulation and experiment results show that the focusing efficiency, spot size, and modulation transfer function of this lens are not sensitive to the incident angle. More importantly, this wide-angle metalens follows the ideal Gaussian formula for the object-image relation, which ensures a wider field of view and better contrast in the imaging experiment.

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Spatial Bessel-like beams along arbitrary convex trajectories based on a 3D-printed metasurface

Tian

et al. 2022

Opt. Lett.

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A 3D-printed all-dielectric metasurface is presented in this Letter which can generate an accelerating beam with a circularly symmetric non-spreading transverse profile that can propagate along arbitrary convex trajectories. The curved trajectory is mapped to the corresponding direct-space spatial phases by the basic cube units with different geometrical heights. The required phase distribution is derived in detail based on the enveloping theory of differential geometry and the Bessel beam generation method. A metasurface with a preset trajectory is simulated and measured to demonstrate the validity of the phase distribution calculated by the proposed theory. The full-wave simulation and measurement results verify that the Bessel-like beam whose intensity follows a curved (off-axis) trajectory can be produced by the proposed metasurface. The generated hybrid beam merges the advantages of non-accelerating and accelerating diffractive-free beams. Therefore, the proposed metasurface has great potential in ultrahigh-speed communication, secure communication, near-field imaging, wireless energy transmission applications, and so on. The all-dielectric characteristic provides the proposed metasurface with the competitive advantages of low cost and easy large-scale processing.

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Terahertz tight-focused Bessel beam generation and point-to-point focusing based on nonlocal diffraction engineering

Cited by 4 publications

References 25 publications

On-chip generation of Bessel–Gaussian beam via concentrically distributed grating arrays for long-range sensing

On-chip generation of Bessel–Gaussian beam via concentrically distributed grating arrays for long-range sensing

Terahertz wide-angle metalens with nearly ideal object-image relation

Spatial Bessel-like beams along arbitrary convex trajectories based on a 3D-printed metasurface

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