Lv Feng

Guangxi University of Science and Technology

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Hongxia Zheng

Tianjin Polytechnic University

Huajin Chen

Guangxi University of Science and Technology

Zhifang Lin

Fudan University

Jiangnan Ma

Guangxi University of Science and Technology

Wanli Lu

China University of Mining and Technology

Feizhou He

Guangxi University of Science and Technology

Lixin Ge

SLAC National Accelerator Laboratory

Chenghua Liang

Guangxi University of Science and Technology

Xiangsuo Fan

Guangxi University of Science and Technology

Zijun Sun

Guangxi University of Science and Technology

Cooperative Institutions

Guangxi University of Science and Technology

Fudan University

State Key Laboratory of Surface Physics

Zhejiang Normal University

Tianjin Polytechnic University

Chongqing University

Nanjing University

Collaborative Innovation Center of Advanced Microstructures

University of Delaware

Hong Kong University of Science and Technology

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Bipolar optical force on a dipolar nanoparticle: Thermally induced switching between optical pulling and optical pushing

Physical review. B./Physical review. B (2023)

Jiangnan Ma Lv Feng Zijun Sun Xiangsuo Fan Lixin Ge

The ability to readily switch between optical pulling and pushing forces on micro-objects is both important and fascinating for arbitrary optical manipulations. The bipolar optical force (namely, optical pulling versus optical pushing) on an object can be achieved generally by elaborately tailoring illuminating optical fields and/or surrounding media. Here, we propose an approach to achieve the temperature-reconfigured bipolar optical force on a dipolar nanoparticle. The basic idea is demonstrated on a particle immersed in a Bessel beam and made of material exhibiting a temperature-induced reversible transition, such as vanadium dioxide. Numerical results based on the decomposed force expressions indicate that the optical pulling force originates from the recoil force dominated by the coupling of electric and magnetic dipoles simultaneously excited on the particle, while the optical pushing force comes mostly from the interception force, which surpasses the recoil force when the excitation of the magnetic dipole is suppressed. Our dynamical simulations show that the nanoparticle can be transversely trapped stably in the vicinity of maximum light intensity while longitudinally switchable between the pulling against and pushing along light propagation. The bipolar characteristic does not require any change of the manipulating light or ambient material, opening interesting possibilities in flexible optical manipulations.

Optical force

Pressure-gradient force

Recoil

10.1103/physrevb.108.134308

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Left-handed optical torque on dipolar plasmonic nanoparticles induced by Fano-like resonance

Physical review. B./Physical review. B (2022)

Huajin Chen Lv Feng Jiangnan Ma Chenghua Liang Zhifang Lin

We theoretically and numerically demonstrate that Fano-like resonance can induce a left-handed optical torque on a dipolar plasmonic core-shell nanoparticle in the interference optical field composed of two linearly polarized plane waves. It is shown that the optical torque on the dipolar plasmonic nanoparticle is significantly enhanced at the Fano-like resonance, and its direction is opposite to that of the angular momentum of the incident field, termed Fano-like resonance-induced left-handed optical torque. The extinction spectra exhibit that the Fano-like resonance stems from the coupling between a narrow electric quadrupole dark mode and a broad electric dipole bright mode. In addition, such Fano-like resonance-induced left-handed optical torque can flexibly be tailored by the particle morphology. To further trace the physical origin of the left-handed optical torque, we derive an analytical expression of optical torques up to electric quadrupole in generic monochromatic optical fields based on the multipole expansion theory. The results obtained from our analytical expression show that the left-handed optical torque comes completely from the electric quadrupole terms while other terms from the electric dipole make no contribution. Our results may open a new avenue for tailoring optical torques on plasmonic structures.

Fano resonance

10.1103/physrevb.106.054301

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Anomalously enhanced transverse optical torque on a dipolar plasmonic nanoparticle in two-wave interference

Optics Letters (2022)

Lv Feng Jiangnan Ma Wanli Lu Huajin Chen Hongxia Zheng

Based on the multipole expansion theory, we show that a transverse optical torque acting on a dipolar plasmonic spherical nanoparticle can be anomalously enhanced in two plane waves with linear polarization. Compared with a homogeneous Au nanoparticle, the transverse optical torque acting on an Au-Ag core-shell nanoparticle with an ultra-thin shell thickness can be dramatically enhanced by more than two orders of magnitude. Such enhanced transverse optical torque is dominated by the interaction between the incident optical field and the electric quadrupole excited in the dipolar core-shell nanoparticle. It is thus noted that the torque expression based on the dipole approximation usually used for dipolar particles is not available even in our dipolar case. These findings deepen the physical understanding of the optical torque (OT) and may have applications in optically driven rotation of plasmonic microparticles.

Optical force

Plasmonic Nanoparticles

10.1364/ol.476994

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Transverse optical torque from the magnetic spin angular momentum

Nanophotonics (2024)

Jiquan Wen Feizhou He Lv Feng Wanli Lu Zhifang Lin

We report a transverse optical torque exerted on a conventional isotropic spherical particle in a direction perpendicular to that of the illuminating wave propagation. By using full-wave simulations and deriving an analytical expression of the transverse optical torque for particle of arbitrary size, the origin of this transverse optical torque is traced exclusively to the magnetic part of the spin angular momentum, regardless of the size and composition of the illuminated particle. To our surprise, for a non-magnetic dielectric particle, the transverse optical torque is found to originate mainly from the magnetic response of the particle, even when the particle size is much smaller than the illuminating wavelength. This is contrary to the general intuition that the electric response of a non-magnetic dielectric particle dominates its magnetic response in the mechanical effect of light, especially in the Rayleigh limit.

Nanomaterials

10.1515/nanoph-2024-0406

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