Hidden symmetry and invariance in optical forces

Jiang，Yikun1,2,3; Lin，Haoze4; Li，Xiao5,6; Chen，Jun7; Du，Junjie8; Ng，Jack9

2019

10.1021/acsphotonics.9b00746

ACS Photonics   影响因子和分区

23304022

2330-4022

Like any physical quantity whose symmetry properties mimics its source, the optical force acting on a neutral spherical particle has a symmetry mimics that of the incident field. The optical force consists of the gradient force and the scattering force. Here, we explicitly show that in optical lattices, the in-plane gradient force and scattering force have an additional even and odd symmetries upon 2N-fold rotation, respectively, which are not shared by the incident field that is N-fold discrete rotationally symmetric. Similar hidden symmetries, namely even and odd symmetries upon reflection about the focal plane, are also found in particle illuminated by a Gaussian beam, suggesting that it is a general property of the optical force. These are verified numerically in multiple examples and analytically for three incident plane waves, by which we also discover that the profiles of the gradient force and the scattering force are invariant with respect to material composition and particle size for spherical particle. As such, one can tune the polarization to almost completely "turn off" either gradient force or scattering force, leaving behind a purely irrotational or solenoidal force fields, respectively, opening a new freedom to control the conservativeness of optical forces.

Conservative force Gradient force Nonconservative force Optical force decomposition Optical trapping Scattering force

SCI ; EI

英语

通讯

HK RGC[AoE/P-02/12] ; HK RGC[C6013-18GF]

Science & Technology - Other Topics ; Materials Science ; Optics ; Physics

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Optics ; Physics, Applied ; Physics, Condensed Matter

WOS:000499742000021

American Chemical Society

20194107526947

Gaussian beams ; Particle size

Electromagnetic Waves:711 ; Laser Beam Interactions:744.8

2-s2.0-85073056530

Scopus

1.State Key Laboratory of Surface PhysicsKey Laboratory of Micro and Nano Photonic StructuresDepartment of PhysicsFudan University,Shanghai,China
2.Collaborative Innovation Center of Advanced MicrostructuresNanjing University,Nanjing,China
3.Department of PhysicsCornell University,Ithaca,United States
4.High School Affiliated to Fudan University,Shanghai,China
5.Department of PhysicsHong Kong Baptist University,Hong Kong,Hong Kong
6.Department of PhysicsHong Kong University of Science and Technology,Hong Kong,Hong Kong
7.Institute of Theoretical PhysicsCollaborative Innovation Center of Extreme OpticsShanxi University,Shanxi,China
8.Department of PhysicsEast China Normal University,Shanghai,China
9.Department of PhysicsSouthern University of Science and Technology,Shenzhen,518055,China

Jiang，Yikun,Lin，Haoze,Li，Xiao,et al. Hidden symmetry and invariance in optical forces[J]. ACS Photonics,2019,6(11):2749-2756.

Jiang，Yikun,Lin，Haoze,Li，Xiao,Chen，Jun,Du，Junjie,&Ng，Jack.(2019).Hidden symmetry and invariance in optical forces.ACS Photonics,6(11),2749-2756.

Jiang，Yikun,et al."Hidden symmetry and invariance in optical forces".ACS Photonics 6.11(2019):2749-2756.