Simultaneous Trapping of Two Types of Particles with Focused Elegant Third-Order Hermite–Gaussian Beams

Abstract

The focusing properties of elegant third-order Hermite–Gaussian beams (TH3GBs) and the radiation forces exerted on dielectric spherical particles produced by such beams in the Rayleigh scattering regime have been theoretically studied. Numerical results indicate that the elegant TH3GBs can be used to simultaneously trap and manipulate nanosized dielectric spheres with refractive indexes lower than the surrounding medium at the focus and those with refractive indexes larger than the surrounding medium in the focal vicinity. Furthermore, by changing the radius of the beam waist, the transverse trapping range and stiffness at the focal plane can be changed.

Calculation of trapping optical forces induced by a focused continuous Hermite Gaussian beam on a nano-dielectric spherical particle

“…These HG beams have really shown an extensive use in the field of optical manipulation and acceleration [29][30][31][32][33][34][35], free-space optical communication [36,37] and nonlinear optics [38,39]. Since the last few years, the trapping characteristics of different Hermite Gaussian beams such as elegant Hermite-Cosine-Gaussian beam [40], Hermite Gaussian vortex beam [41], elegant third-order Hermite-Gaussian beams [42] and elegant Hermite-Cosh-Gaussian beams [43] have been theoretically studied. In contrast to the several studies previously made on the HG beam, and to the best of our knowledge, there is no any theoretical study has been conducted regarding the calculations of optical trapping forces induced by focused continuous Hermite Gaussian beam on a nano-dielectric spherical particle.…”

Effect of astigmatism on the beam quality factor of Hermite-Gauss laser beams

“…12 Subsequent to this, George et al performed a theoretical analysis of the beam quality factor of a Laguerre-Gaussian beam through a spherically aberrated lens. 13 There is another family of high-order Gaussian modes called Hermite-Gaussian modes which has gained considerable attention in the past few decades, having found a myriad of applications in nonlinear optics, 14 electron acceleration, [15][16][17] atom trapping [18][19][20] and free-space optical communications. [21][22][23][24][25][26] These modes can be generated intra-cavity through specially designed lasers [27][28][29][30][31][32] and extra-cavity using phase-shifting diffractive optical elements.…”