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Chin. Phys. B, 2020, Vol. 29(8): 084201    DOI: 10.1088/1674-1056/ab9616
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Gain-induced large optical torque in optical twist settings

Genyan Li(李艮艳)1,2,3, Xiao Li(李肖)4, Lei Zhang(张磊)2,3,5, Jun Chen(陈君)1,2,3
1 Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China;
2 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Taiyuan 030006, China;
3 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China;
4 Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, China;
5 Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
Abstract  Inducing a significant optical torque remains a challenging task, since the law of angular momentum conservation implies that one has to harvest a lot of light. Such a problem was partially resolved by using optical twist via strong internal multiple scattering to recycle the photons, and one can induce a large torque per unit of radiation cross section. By using the Maxwell stress tensor and the generalized Lorentz-Mie scattering theory for multi-spheres, we investigate the influence of gain materials in further amplifying optical torque in the optical twist settings. It is found that, when combined with a gain layer, the optical torque of lossy (both in PT-and non-PT-symmetric structures) or lossless (low dielectric materials) clusters at resonance could be one order of magnitude larger than those of a single layer and previous studied plasmonic double layer structures. Moreover, the gain-enhanced large opposite rotations (i.e., optical twist) of the two layers arise at resonances in these structures. In contrast, in the gain-gain double-layer cluster, optical torques on both layers have no significant increase and the two layers rotate in the same direction at resonances. This work provides an elaborate investigation on the gain media-induced optical twist, which offers more choices for optical micromanipulation.
Keywords:  optical torque      optical twist      gain medium      double-layer clusters  
Received:  02 March 2020      Revised:  13 May 2020      Published:  05 August 2020
PACS:  42.50.Wk (Mechanical effects of light on material media, microstructures and particles)  
  78.70.-g (Interactions of particles and radiation with matter)  
  42.25.Fx (Diffraction and scattering)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11674204 and 11704232) and the Fund from HK RGC, China (Grant Nos. AoE/P-02/12 and C6013-18GF).
Corresponding Authors:  Jun Chen     E-mail:  chenjun@sxu.edu.cn

Cite this article: 

Genyan Li(李艮艳), Xiao Li(李肖), Lei Zhang(张磊), Jun Chen(陈君) Gain-induced large optical torque in optical twist settings 2020 Chin. Phys. B 29 084201

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