Generation of an Adjustable Optical Cage through Focusing an Apertured Bessel-Gaussian Correlated Schell-Model Beam

Abstract

An adjustable optical cage generated by focusing a partially coherent beam with nonconventional correlation function named the Bessel–Gaussian correlated Schell-model (BGCSM) beam is investigated in detail. With the help of the generalized Huygens–Fresnel integral and complex Gaussian function expansion, the analytical formula of the BGCSM beam passing through an apertured ABCD optical system was derived. Our numerical results show that the generated optical cage can be moderately adjusted by the aperture radius, the spatial coherence width, and the parameter β of the BGCSM beam. Furthermore, the effect of these parameters on the effective beam size and the spectral degree of coherence were also analyzed. The optical cage with adjustable size can be applied for particle trapping and material thermal processing.

Partially Coherent Flat-Topped Beam Generated by an Axicon

“…With the rapid development of partially coherent light and its wide applications [17], nonconventional partially coherent light, the correlation function of which does not satisfy a Gaussian distribution, has been proposed [18,19]. It has been confirmed both theoretically and experimentally that the correlation function provides a new effective way to shape the intensity profile [20][21][22][23][24][25][26][27][28][29][30]. What is the effect of the nonconventional correlation function on the intensity distribution of beams focused by an axicon lens?…”

Simultaneous and independent capture of multiple Rayleigh dielectric nanospheres with sine-modulated Gaussian beams

“…Since Ashkin et al first demonstrated that a focused Gaussian beam could trap particles [6][7][8] , providing a useful method for trapping micron particles, optical tweezers have made great progress in many fields. Through the unremitting efforts of researchers, various beams were reported and used for trapping and manipulating tiny objects, including Bessel-Gaussian beams [9][10][11] , hollow Gaussian beams [12][13][14] , partially coherent beams 15,16 , and airy beams [17][18][19] . The Bessel beam is well-known for its non-diffractive and self-reconstruction characteristics, and it can axially transport particles and simultaneously capture multilayer particles 9 .…”