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A review of optically induced rotation

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Frontiers of Information Technology & Electronic Engineering 2022年第2期23卷 171-185页

作者： Qi Zhu Nan LI Heming SU Wenqiang LI huizhu hu State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China Zhejiang Lab Hangzhou 311121China

The optical rotation technique arose in the 1990 s.Optical tweezer brought an ideal platform for research on the angular momentum of laser beams.For decades,the optical rotation technique has been widely applied in laboratory optical manipulation and the fields of biology and optofluidics.Recently,it has attracted much attention for its potential in the classical and quantum regimes.In this work,we review the progress of experiments and applications of optically induced rotation.First,we introduce the basic exploration of angular momentum.Then,we cover the development and application of optical rotation induced by orbital angular momentum,and the spin angular momentum is presented.Finally,we elaborate on recent applications of the optical rotation technique in high vacuum.As precise optical manipulation in a liquid medium enters its maturity,optical tweezers in high vacuum open a new path for the high-speed micro-rotor.

关键词： Optical tweezer Optically induced rotation Angular momentum Micro-rotor

Nanoscale electric field sensing using a levitated nano-resonator with net charge

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Photonics Research 2023年第2期11卷 279-289页

作者： SHAOCONG Zhu ZHENHAI FU XIAOWEN GAO CUIHONG LI ZHIMING CHEN YINGYING WANG XINGFAN CHEN huizhu hu Quantum Sensing Center Zhejiang LabHangzhou 310000China State Key Laboratory of Modern Optical Instruments College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China

The nanomechanical resonator based on a levitated particle exhibits unique advantages in the development of ultrasensitive electric field detectors. We demonstrate a three-dimensional, high-sensitivity electric field measurement technology using the optically levitated nanoparticle with known net charge. By scanning the relative position between nanoparticle and parallel electrodes, the three-dimensional electric field distribution with microscale resolution is obtained. The measured noise equivalent electric intensity with charges of 100e reaches the order of 1 μV·cm^(-1)·Hz^(-1/2)at 1.4 × 10^(-7) mbar. Linearity analysis near resonance frequency shows a measured linear range over 91 d B limited only by the maximum output voltage of the driving equipment. This work may provide an avenue for developing a high-sensitivity electric field sensor based on an optically levitated nano-resonator.

关键词： resonator field charge

Displacement Calibration of Optical Tweezers With Gravitational Acceleration

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Photonic Sensors 2023年第4期13卷 62-72页

作者： Jianyu YANG Nan LI Xunmin Zhu Ming CHEN Mian WU Xingfan CHEN Cheng LIU Jian ZhuANG huizhu hu College of Optical Science and Engineering Zhejiang UniversityHangzhou 310027China Quantum Sensing Center Zhejiang LabHangzhou 310000China State Key Laboratory of Modern Optical Instrumentation Zhejiang UniversityHangzhou 310027China HIWING Technology Academy of CASIC Beijing 100074China

In recent years,levitated particles of optical traps in vacuum have shown the enormous potential for precision sensor development and new physics exploration.However,the accuracy of the sensor is still hampered by the uncertainty of the calibration factor relating the detected signal to the absolute displacement of the trapped particle.In this paper,we suggest and experimentally demonstrate a novel calibration method for optical tweezers based on free-falling particles in vacuum,where the gravitational acceleration is introduced as an absolute reference.Our work provides a calibration protocol with a great certainty and traceability,which is significant in improving the accuracy of precision sensing based on levitated optomechanical systems.

关键词： Optical tweezers calibration free-falling particles

Yoctonewton force detection based on optically levitated oscillator

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Fundamental Research 2023年第1期3卷 57-62页

作者： Tao Liang Shaochong Zhu Peitong He Zhiming Chen Yingying Wang Cuihong Li Zhenhai Fu Xiaowen Gao Xinfan Chen Nan Li Qi Zhu huizhu hu Zhejiang Lab Hangzhou 311121China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China

Optically levitated oscillators in high vacuum have excellent environmental isolation and low mass compared with conventional solid-state sensors,which makes them suitable for ultrasensitive force detection.The force resolution usually scales with the measurement bandwidth,which represents the ultimate detection capability of the system under ideal conditions if sufficient time is provided for measurement.However,considering the stability of a real system,a method based on the Allan variance is more reliable to evaluate the actual force detection performance.In this study,a levitated optomechanical system with a force detection sensitivity of 6.33±1.62 zN/Hz^(1/2)was demonstrated.And for the first time,the Allan variance was introduced to evaluate the system stability due to the force sensitivity fluctuations.The force detection resolution of 166.40±55.48 yN was reached at the optimal measurement time of 2751 s.The system demonstrated in this work has the best force detection performance in both sensitivity and resolution that have been reported so far for optically levitated particles.The reported high-sensitivity force detection system is an excellent candidate for the exploration of new physics such as fifth force searching,high-frequency gravitational waves detection,dark matter research and so on.

关键词： Levitated oscillators Optical trap Feedback cooling Force detection Allan variance

Dynamic Analysis and Simulation of an Optically Levitated Rotating Ellipsoid Rotor in Liquid Medium

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Photonic Sensors 2022年第2期12卷 105-116页

Optical trap,a circularly polarized laser beam can levitate and control the rotation of microspheres in liquid medium with high stiffness.Trapping force performs as confinement while the trapped particle can be analog to a liquid floated gyroscope with three degree-of-ffeedom.In this work,we analyzed the feasibility of applying optically levitated rotor in the system.We presented the dynamic analysis and simulation of an ellipsoid micron particle.The precession motion and nutation motion of a rotating ellipsoid probe particle in optical tweezers were performed.We also analyzed the attitude changes of an optically levitated ellipsoid when there was variation of the external torque caused by deviation of the incident light that was provided.Furthermore,the trail path of the rotational axis vertex and the stabilization process of a particle of different ellipticities were simulated.We compared the movement tendencies of particles of different shapes and analyzed the selection criteria of ellipsoid rotor.These analytical formulae and simulation results are applicable to the analysis of the rotational motion of particles in optical tweezers,especially to the future research of the gyroscope effect.

关键词： Optical Tweezers rotor optically induced rotation dynamic analysis

Actual Sensing Sensitivity and SNR Measurement of Optical Tweezers Based on Coulomb Force Input

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Photonic Sensors 2023年第1期13卷 56-65页

作者： Jiaojiao WANG Xingfan CHEN Shaochong Zhu Zhenhai FU Nan LI huizhu hu State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China Quantum Sensing Center Zhejiang LabHangzhou 310000China

Sensing sensitivity is the key performance of optical tweezers.By adjusting the frequency and magnitude of an applied Coulomb force as an input of optical tweezers,we directly measured the sensitivity and signal-to-noise ratio(SNR)of a system and indirectly calculated the actual noise magnitude.Combined with an output filter,the relationship between the SNR and bandwidths was studied.We established the simulation model of a system using Simulink and simulated the relationship between the SNR and magnitude of the input forces and filter bandwidths.In addition,we built an experimental system to determine the relationship between the SNR and the magnitude of the input forces and filter bandwidths.The actual minimum detectable force was measured as 1.8275×10^(-17)N at a 1Hz bandwidth.The experimental results were correlated with the simulation and theoretical results,confirming the effectiveness of the proposed method and demonstrating the high sensitivity of vacuum optical tweezers as mechanical sensors.We proposed a novel method of calibration and measurement of system sensing parameters by applying an actual force that was more direct and precise than the theoretical calculation method that requires accurate fitting parameters,such as the particle radius and density.This method can be employed to analyze the system noise and phase characteristics to confirm and improve the real performance of the system.

关键词： Optical tweezers sensitivity Coulomb force SNR Simulink system noise characteristic

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面向悬浮光力系统的集成化反馈控制器研究

导航定位与授时 2024年第2期11卷 28-34页

作者：王颖颖郑毅梁韬章逸舟傅振海高晓文陈杏藩胡慧珠之江实验室量子传感研究中心杭州310023 浙江大学光电科学与工程学院杭州310027

悬浮光力系统具有高灵敏度、高稳定性和低耗散等特点,有望发展成为新型高性能力学传感器。针对目前悬浮光力系统存在的反馈控制器兼容性差、软硬件成本高、集成度低等问题,提出了一种兼容多种反馈控制模式的软硬件设计方案,并研制了一... 详细信息

悬浮光力系统具有高灵敏度、高稳定性和低耗散等特点,有望发展成为新型高性能力学传感器。针对目前悬浮光力系统存在的反馈控制器兼容性差、软硬件成本高、集成度低等问题,提出了一种兼容多种反馈控制模式的软硬件设计方案,并研制了一套高度集成的反馈控制器,在160 mm×170 mm×42 mm的尺寸上集成了六通道模数/数模转换器、滤波器、现场可编程门阵列+微处理器(FPGA+ARM)等功能模块,并且开发了基于数字锁相环和比例积分微分(PID)控制器的控制算法,最终在同一套硬件系统上实现了跨尺度微粒的运动信息采集和反馈控制,以及数十赫兹至亚兆赫兹的感知带宽。实验结果表明,该集成反馈控制器能够实现超高真空(10-6 Pa量级)下亚微米及微米尺度微粒的稳定悬浮和运动控制。在扩展系统感知带宽的同时减小了整体体积,为悬浮光力传感技术的器件化奠定了基础。

关键词：反馈控制器集成化悬浮光力系统数字锁相环力学传感

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Tunable phonon-atom interaction in a hybrid optomechanical system

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Chinese Physics B 2023年第4期32卷 58-62页

作者：李耀李闯张建东董莹胡慧珠 State Key Laboratory of Modern Optical Instrumentation&College of Optical Science and Engineering Zhejiang UniversityHangzhou 310027China Research Center for Quantum Sensing Zhejiang LaboratoryHangzhou 311121China School of Mathematics and Physics Jiangsu University of TechnologyChangzhou 213001China

We theoretically analyze a hybrid system consisting of a levitated neutral atom and a nanoparticle coupled to a cavity.The mechanical oscillator and the atom are effectively coupled to each other through the cavity photons as a bus.By adjusting the driving lasers,we can conveniently switch the phonon-atom coupling between Jaynes-Cummings(JC)and anti-JC forms,which can be used to manipulate the motional states of the mechanical oscillator.As an application,we prepare a superposition state of the mechanical oscillator via the effective phonon-atom interaction and investigate the effects of dissipation on the state generation.

关键词： optomechanics hybrid system optical tweezers Fock state

无人机群辅助边缘计算系统的任务卸载和资源分配联合优化

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系统工程与电子技术 2024年第2期46卷 751-760页

作者：刘世豪黄仰超胡航司江勃韩蕙竹安琪空军工程大学信息与导航学院陕西西安710077 西安电子科技大学综合业务网理论及关键技术国家重点实验室陕西西安710071

为提升无人机群辅助边缘计算系统在负载不均衡场景下的性能,构建了一种新的无人机群边缘计算系统,利用无人机之间卸载数据来提高计算资源的利用率,通过联合优化多架无人机的卸载方案、部署和资源分配,使得系统的时延和能耗加权和最小。... 详细信息

为提升无人机群辅助边缘计算系统在负载不均衡场景下的性能,构建了一种新的无人机群边缘计算系统,利用无人机之间卸载数据来提高计算资源的利用率,通过联合优化多架无人机的卸载方案、部署和资源分配,使得系统的时延和能耗加权和最小。该问题高度非凸,为此提出一种高效的双层优化算法——启发最优评价算法,上层使用粒子群算法优化无人机位置,下层在确定位置的情况下使用块坐标下降算法优化无人机的数据卸载和资源分配。仿真结果表明,所提方案可有效降低系统成本,与基准策略相比优势明显。

关键词：边缘计算无人机群任务卸载资源分配位置优化