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The complex Maxwell stress tensor theorem:The imaginary stress tensor and the reactive strength of orbital momentum.A novel scenery underlying electromagnetic optical forces

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Light(Science & Applications) 2022年第11期11卷 2655-2675页

作者： manuel Nieto-Vesperinas Xiaohao Xu Instituto de Ciencia de Materiales de Madrid Consejo Superior de Investigaciones Cintificas.Campus de CantoblancoMadrid 28049Spain State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi'an 710119China Institute of Nanophotonics Jinan UniversityGuangzhou 511443China

We uncover the existence of a universal phenomenon concerning the electromagnetic optical force exerted by light or other electromagnetic waves on a distribution of charges and currents in general,and of particles in particular.This conveys the appearence of underlying reactive quantities that hinder radiation pressure and currently observed timeaveraged forces.This constitutes a novel paradigm of the mechanical effciency of light on matter,and completes the landscape of the optical,and generally electromagnetic,force in photonics and classical electrodynamics;widening our understanding in the design of both llumination and particles in optical manipulation without the need of increasing the illuminating power,and thus lowering dissipation and heating.We show that this may be accomplished through the minimization of what we establish as the reactive strength of orbital(or canonical)momentum,which plays against the optical force a role analogous to that of the reactive power versus the radiation effciency of an antenna.This long time overlooked quantity,important for current progress of optical manipulation,and that stems from the complex Maxwell theorem of conservation of complex momentum that we put forward,as well as its alternating flow associated to the imaginary part of the complex Maxwell stress tensor,conform the imaginary Lorentz force that we introduce in this work,and that like the reactive strength of orbital momentum,is antagonistic to the well-known time-averaged force;thus making this reactive Lorentz force indirectly observable near wavelengths at which the time-averaged force is lowered.The Minkowski and Abraham momenta are also addressed.

关键词： imaginary tensor orbital

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Optical manipulation from the microscale to the nanoscale: fundamentals, advances and prospects

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Light(Science & Applications) 2017年第1期6卷 593-607页

作者： Dongliang Gao Weiqiang Ding manuel Nieto-Vesperinas Xumin Ding Mahdy Rahman Tianhang Zhang ChweeTeck Lim Cheng-Wei Qiu Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore College of Physics Optoelectronics and EnergySoochow UniversitySuzhou 215006China Department of Physics Harbin Institute of TechnologyHarbin 150001China Instituto de Ciencia de Materiales de Madrid Consejo Superior de Investigaciones CientíficasCampus de CantoblancoMadrid 28049Spain Department of Electrical and Computer Engineering North South UniversityDhaka 1229Bangladesh NUS Graduate School for Integrative Sciences and Engineering National University of SingaporeSingapore 117456Singapore Department of Mechanical Engineering National University of SingaporeSingapore 117576Singapore SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology Shenzhen UniversityShenzhen 518060China

Since the invention of optical tweezers,optical manipulation has advanced significantly in scientific areas such as atomic physics,optics and biological science.Especially in the past decade,numerous optical beams and nanoscale devices have been proposed to mechanically act on nanoparticles in increasingly precise,stable and flexible ways.Both the linear and angular momenta of light can be exploited to produce optical tractor beams,tweezers and optical torque from the microscale to the nanoscale.Research on optical forces helps to reveal the nature of light–matter interactions and to resolve the fundamental aspects,which require an appropriate description of momenta and the forces on objects in matter.In this review,starting from basic theories and computational approaches,we highlight the latest optical trapping configurations and their applications in bioscience,as well as recent advances down to the nanoscale.Finally,we discuss the future prospects of nanomanipulation,which has considerable potential applications in a variety of scientific fields and everyday life.

关键词： biochemical manipulation microscale nanoscale optical force optical tweezer plasmonics

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