Optical pulling force on nonlinear nanoparticles with gain

Chen, Hongli; Gao, Lei; Zhong, Chonggui; Yuan, Guoliang; Yu, Zhongwei; Cao, Min; Wang, Meng

doi:10.1063/1.5131004

Cited by 6 publications

(3 citation statements)

References 41 publications

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“…1]. The relative permittivity of gain material is described as ε c = ε cr − iε ci [14,16] and ε ci > 0 corresponds to the gain material on the assumption that it is time-dependent, specifically in the form of e −iωt . The gain effect is realized by encapsulating fluorescent dye molecules into the dielectric material with external pumping.…”

Section: Model and Theoriesmentioning

confidence: 99%

“…[1][2][3][4][5][6] The optical pulling force could be achieved via Gaussian beam, [7,8] Bessel beam, [9] and other tractor beams. Moreover, optical pulling forces acting on chiral, [10][11][12] hyperbolic [13] or gain [14][15][16] materials have been investigated. The pulling force would be achieved only when the appropriate gain is introduced in the structure.…”

Section: Introductionmentioning

confidence: 99%

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Graphene-tuned threshold gain to achieve optical pulling force on microparticle*

Chen¹,

Huang²

2021

Chinese Phys. B

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We investigate optical force on a graphene-coated gain microparticle by adopting the Maxwell’s stress tensor method. It is found that there exists a threshold gain in obtaining the Fano-profile optical force which indicates the reversal of optical pushing and pulling force. And giant pushing/pulling force can be achieved if the gain value of the material is in the proximity of the threshold gain. Our results show that the threshold gain is more sensitive to the relaxation time than to the Fermi energy of the graphene. We further study the optical force on larger microparticle to demonstrate the pulling force occurring at octupole resonance with small gain value and then it will appear at quadrupole resonance by increasing gain value. Our work provides an in-depth insight into the interaction between light and gain material and gives the additional degree of freedom to optical manipulation of microparticle.

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Section: Model and Theoriesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Graphene-tuned threshold gain to achieve optical pulling force on microparticle*

Chen¹,

Huang²

2021

Chinese Phys. B

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“…Bessel beams [ 5 , 6 , 7 , 8 ], a typical nondiffracting beam, can simultaneously trap and manipulate many particles in multiple planes because of their unique properties of nondiffraction and self-healing. In addition, by adjusting the beam parameters including half-cone angle, beam order, and polarization, Bessel beams can exert pulling force [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ] and negative optical torque [ 3 , 37 , 38 , 39 , 40 , 41 ] on particles.…”

Section: Introductionmentioning

confidence: 99%

Optical Force and Torque on a Graphene-Coated Gold Nanosphere by a Vector Bessel Beam

Yan

Ling

et al. 2022

Micromachines

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In the framework of the generalized Lorenz–Mie theory (GLMT), the optical force and torque on a graphene-coated gold nanosphere by a vector Bessel beam are investigated. The core of the particle is gold, whose dielectric function is given by the Drude–Sommerfeld model, and the coating is multilayer graphene with layer number N, whose dielectric function is described by the Lorentz–Drude model. The axial optical force Fz and torque Tz are numerically analyzed, and the effects of the layer number N, wavelength λ, and beam parameters (half-cone angle α0, polarization, and order l) are mainly discussed. Numerical results show that the optical force and torque peaks can be adjusted by increasing the thickness of the graphene coating, and can not be adjusted by changing α0 and l. However, α0 and l can change the magnitude of the optical force and torque. The numerical results have potential applications involving the trapped graphene-coated gold nanosphere.

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Light-driven PT symmetry in colloids with gain and loss nanoparticles

Zharov,

Zharova

2023

J. Opt. Soc. Am. B

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We consider a planar layer of a colloid solution with gain and loss nanoparticles. The concentration of the particles of both types is assumed to provide balanced light amplification and dissipation in the corresponding effective medium. The normally incident plane electromagnetic wave causes the spatial separation of gain and loss particles due to the pulling and pushing ponderomotive forces that act on active and absorptive particles, respectively. We show that at the moderate intensity of incident light, the emerging stationary distribution of the gain and loss nanoparticles forms a parity–time (PT)-symmetric profile of the effective dielectric permittivity satisfying the condition εeff(−z)=εeff∗(z). The magnitude of the imaginary part of the colloid refractive index can be controlled by the intensity of incident light, which makes the proposed tunable PT-symmetric layer a promising tool for studying non-Hermitian optical phenomena.

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Optical pulling force on nonlinear nanoparticles with gain

Cited by 6 publications

References 41 publications

Graphene-tuned threshold gain to achieve optical pulling force on microparticle*

Graphene-tuned threshold gain to achieve optical pulling force on microparticle*

Optical Force and Torque on a Graphene-Coated Gold Nanosphere by a Vector Bessel Beam

Light-driven PT symmetry in colloids with gain and loss nanoparticles

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