Sidelobe suppression for coherent beam combining with laser beams placed along a Fermat spiral

Gao, Yang; Liao, Jiali; Xu, Jun; Zhou, Zhanrong

doi:10.3788/col202220.021405

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…In previous studies, the Fermat Spiral structure was widely implemented in phased arrays [16]. The results show that the coherent synthesis of the spiral array has lower sidelobe energy and obtains higher energy at the far-field center than the periodic arranged array [17,18]. Therefore, the automatic aperiodic distribution of the array elements is expected to realize the sidelobe suppression of the super-oscillatory focal field.…”

Section: Introductionmentioning

confidence: 98%

Low Sidelobe Super-Resolution Lens Based on Fermat Spiral-Arranged Dielectric Nano-Columns

Liao,

Lan,

Sun

et al. 2023

IEEE Photon. Technol. Lett.

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Super-resolution lenses (SRLs) based on the principle of optical super-oscillation are composed of subwavelength structural units, which can achieve precise control of light properties through suitable design. A bio-inspired SRL structure with Fermat Spiral-arranged dielectric nano-column is proposed in this paper for the first time. Owing to the unequally spaced arrangement of the Fermat Spiral, the proposed SRL can effectively suppress the sidelobe of the focal field and achieve a high focusing efficiency. The focusing properties of the SRL are investigated detailedly by simulation. The focusing efficiency and the peak sidelobe ratio of the focal field are 72.8% and 16.02 dB, respectively, at the wavelength of 1.55 μm. And an ultra-wide working bandwidth of 200 nm are achieved by the proposed SRL with high focusing efficiencies and low sidelobe energies in the whole bandwidth. In addition, the sub-diffraction limit focusing is achieved by only controlling the radius of the nano-columns, and the bio-inspired Fermat Spiral-arranged SRL exhibits a large tolerance of the fabrication error.

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Section: Introductionmentioning

confidence: 98%

Low Sidelobe Super-Resolution Lens Based on Fermat Spiral-Arranged Dielectric Nano-Columns

Liao,

Lan,

Sun

et al. 2023

IEEE Photon. Technol. Lett.

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Ghost imaging based on Fermat spiral laser array designed for remote sensing

Lai,

Lei,

Meng

et al. 2023

Opt. Express

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We propose a Fermat spiral laser array as illumination source in ghost imaging. Due to the aperiodic structure, the Fermat spiral laser array generates illuminating light field without spatial periodicity on the normalized second-order intensity correlation function. A single-pixel detector is used to receive the signal light from object for image reconstruction. The effects of laser array parameters on the quality of ghost imaging are analyzed comprehensively. Through experimental demonstration, the Fermat spiral laser array successfully achieves ghost imaging with high quality by combining with the compressive sensing reconstruction algorithm. This method is expected to be applied in remote sensing by combining with phased and collimated fiber laser array equipped with the high emitting power and high-speed modulation frequency.

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Sidelobe suppression for coherent beam combining with laser beams placed along a Fermat spiral

Cited by 2 publications

References 23 publications

Low Sidelobe Super-Resolution Lens Based on Fermat Spiral-Arranged Dielectric Nano-Columns

Low Sidelobe Super-Resolution Lens Based on Fermat Spiral-Arranged Dielectric Nano-Columns

Ghost imaging based on Fermat spiral laser array designed for remote sensing

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