Low-frequency(LF)wireless communications play a crucial role in ensuring antiinterference,long-range,and efficient communication across various environments.However,in conventional LF communication systems,their anten...Low-frequency(LF)wireless communications play a crucial role in ensuring antiinterference,long-range,and efficient communication across various environments.However,in conventional LF communication systems,their antenna size is required to be inversely proportional to the frequency,so that their mobility and flexibility are greatly limited.Here we introduce a novel prototype of LF receiving antennas based on optically levitated nanoparticles,which overcomes the size-frequency limitation to reduce the antenna size to the hundred-nanometer scale.These charged particles are extremely sensitive to external electric field as mechanical resonators,and their resonant frequencies are adjustable.The effectiveness of these antennas was experimentally demonstrated by using the frequency shift keying(2FSK)modulation scheme.The experimental results indicate a correlation between error rate and factors such as transmission rate,signal strength,and vacuum degree with a signal strength of approximately 0.1V/m and a bit error rate below 0.1%.We extend the application of levitated particle mechanical resonators as an entirely new type of compact LF antennas,which may be utilized in long-distance communications in extreme environments.展开更多
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 ...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.展开更多
The suppression of polarization cross talk in lead zirconate titanate phase modulators as a key error source has been challenging for open-loop fiber optic gyroscopes(FOGs).We developed a polarization-diversity optica...The suppression of polarization cross talk in lead zirconate titanate phase modulators as a key error source has been challenging for open-loop fiber optic gyroscopes(FOGs).We developed a polarization-diversity optical frequency domain reflectometry(OFDR)to measure the distributed modulation polarization error in the modulator.The error contributes 8×10^(−6) rad to FOG’s bias instability.Using a UV-fabricated in-fiberλ/4 wave plate and polarization-mode converter with fiber taper technology,the modulation error has been suppressed by 15 dB in assembled FOGs.This approach reduced error with temperature from 25°/h to 0.7°/h,meeting the requirements of control-level gyroscopes with bias errors less than 1°/h.展开更多
Arrays of optically levitated nanoparticles with fully tunable light-induced dipole–dipole interactions have emerged as a platform for fundamental research and sensing applications.However,previous experiments utiliz...Arrays of optically levitated nanoparticles with fully tunable light-induced dipole–dipole interactions have emerged as a platform for fundamental research and sensing applications.However,previous experiments utilized two optical traps with identical polarization,leading to an interference effect.Here,we demonstrate light-induced dipole–dipole interactions using two orthogonally polarized optical traps.Furthermore,we achieve control over the strength and polarity of the optical coupling by adjusting the polarization and propose a method to simultaneously and stably measure conservative and non-conservative coupling rates.Our results provide a new scheme for exploring entanglement and topological phases in arrays of levitated nanoparticles.展开更多
基金supported by National Key Research and Development Program of China(2022YFB3203402)Major Project of Natural Science Foundation of Zhejiang Province(LD22F050002)+2 种基金Major Scientific Research Project of Zhejiang Lab(2019MB0AD01)institute-initiated Research Project of Zhejiang Lab(2024SSYS0014)National Natural Science Foundation of China(62005248).
文摘Low-frequency(LF)wireless communications play a crucial role in ensuring antiinterference,long-range,and efficient communication across various environments.However,in conventional LF communication systems,their antenna size is required to be inversely proportional to the frequency,so that their mobility and flexibility are greatly limited.Here we introduce a novel prototype of LF receiving antennas based on optically levitated nanoparticles,which overcomes the size-frequency limitation to reduce the antenna size to the hundred-nanometer scale.These charged particles are extremely sensitive to external electric field as mechanical resonators,and their resonant frequencies are adjustable.The effectiveness of these antennas was experimentally demonstrated by using the frequency shift keying(2FSK)modulation scheme.The experimental results indicate a correlation between error rate and factors such as transmission rate,signal strength,and vacuum degree with a signal strength of approximately 0.1V/m and a bit error rate below 0.1%.We extend the application of levitated particle mechanical resonators as an entirely new type of compact LF antennas,which may be utilized in long-distance communications in extreme environments.
基金supported by grants from the National Natural Science Foundation of China(62005248,62075193)Major Project of Natural Science Foundation of Zhejiang Province(LD22F050002)+2 种基金Major Scientific Research Project of Zhejiang Lab(2019MB0AD01,2021MB0AL02,2022MB0AL02)the Fundamental Research Funds for the Central Universities,China(2016XZZX00401 and 2018FZA5002)the National Program for Special Support of Top-Notch Young Professionals(W02070390),China.
文摘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.
基金supported by the National Natural Science Foundation of China(Nos.61975166,62322510,and 62375223).
文摘The suppression of polarization cross talk in lead zirconate titanate phase modulators as a key error source has been challenging for open-loop fiber optic gyroscopes(FOGs).We developed a polarization-diversity optical frequency domain reflectometry(OFDR)to measure the distributed modulation polarization error in the modulator.The error contributes 8×10^(−6) rad to FOG’s bias instability.Using a UV-fabricated in-fiberλ/4 wave plate and polarization-mode converter with fiber taper technology,the modulation error has been suppressed by 15 dB in assembled FOGs.This approach reduced error with temperature from 25°/h to 0.7°/h,meeting the requirements of control-level gyroscopes with bias errors less than 1°/h.
基金Zhejiang Provincial Natural Science Foundation(LD22F050002)National Natural Science Foundation of China(62305308,62205290,62005248,62075193)+2 种基金Fundamental Research Funds for the Central Universities(226-2024-00018)National Program for Special Support of Top-Notch Young Professionals,China(W02070390)Key Research and Development Program of the Ministry of Science and Technology(2022YFB3203402)。
文摘Arrays of optically levitated nanoparticles with fully tunable light-induced dipole–dipole interactions have emerged as a platform for fundamental research and sensing applications.However,previous experiments utilized two optical traps with identical polarization,leading to an interference effect.Here,we demonstrate light-induced dipole–dipole interactions using two orthogonally polarized optical traps.Furthermore,we achieve control over the strength and polarity of the optical coupling by adjusting the polarization and propose a method to simultaneously and stably measure conservative and non-conservative coupling rates.Our results provide a new scheme for exploring entanglement and topological phases in arrays of levitated nanoparticles.
