The laser trapping of untransmissive particles are discussed in this paper. Photon can generate the momentum tothe untransmissive particle by diffraction and reflection on the surface of the particles. We tried laser ...The laser trapping of untransmissive particles are discussed in this paper. Photon can generate the momentum tothe untransmissive particle by diffraction and reflection on the surface of the particles. We tried laser trapping ofuntransmissive particles using an attractive force caused by the diffraction and radiation force caused by reflection.The laser trapping system includes CW YAG laser, which has 1.064 μm in wave length and an optical microscope.The motions of particles were monitored by a CCD camera on the top of the microscope and recordedby PC connected to the CCD camera.展开更多
A single particle magneto-confined in a one-dimensional （1D） quantum wire experiences a harmonic potential, and imposing a sharply focused laser beam on an appropriate site shapes a δ potential. The theoretical inv...A single particle magneto-confined in a one-dimensional （1D） quantum wire experiences a harmonic potential, and imposing a sharply focused laser beam on an appropriate site shapes a δ potential. The theoretical investigation has demonstrated that for a sufficiently strong δ pulse the quantum motional stationary state of the particle is one of the eigenstates of the free harmonic oscillator, and it is determined by the site of the laser beam uniquely, namely a quantum state is admissible if and only if the laser site is one of its nodes. The numerical computation shows that all the nodes of the lower energy states with quantum numbers n ≤ 20, except the coordinate origin, are mutually different. So we can manipulate the multiphoton transitions between the quantum states by adjusting the position of the laser δ pulse and realize the transition from an unknown higher excitation state to a required lower energy state.展开更多
Plasma-based optical elements can withstand laser intensities several orders of magnitude higher than traditional optical elements,making them highly promising for manipulating relativistic intensity laser pulses.In t...Plasma-based optical elements can withstand laser intensities several orders of magnitude higher than traditional optical elements,making them highly promising for manipulating relativistic intensity laser pulses.In this work,we propose and demonstrate a novel microstructured plasma target,inspired by the design of traditional Fresnel zone plates.The specific target structure causes diffraction of the input laser at each zone,resulting in constructive interference and facilitating effective focusing of the input laser pulse.Three-dimensional particle-in-cell simulation results show that the microstructured plasma target can focus Gaussian laser pulses with an intensity of the order of 10^(22) W/cm^(2)to an intensity exceeding 10^(24) W/cm^(2)with the laser focus spot size approaching the diffraction limit of-0.73μm and laser fluence enhancement by a factor of 46.It is also found that when the microstructured plasma target is modified into a reflective element,laser intensities up to 10^(25) W/cm^(2)may be achieved.This extremely high-intensity tightly focused laser pulse can trigger intense photon radiation when interacting with targets,(e.g.,wire plasma targets),with potential applications in laboratory astrophysics,as well as providing the opportunity to explore phenomena such as vacuum birefringence and quantum electrodynamical cascades.展开更多
We propose a scheme for generating an entangled state for three atoms trapped in separate optical cavities that are coupled to each other through two optical fibers based on coherent driving and dissi- pation, which a...We propose a scheme for generating an entangled state for three atoms trapped in separate optical cavities that are coupled to each other through two optical fibers based on coherent driving and dissi- pation, which are induced by the classical fields and the decay of non-local bosonic modes, respectively. In our scheme, the interaction time need not be controlled strictly in the overall dynamics process, and the cavity field decay can be changed into a vital resource. The numerical simulation shows that the fidelity of the target state is insensitive to atomic spontaneous emission, and our scheme is good enough to generate the W state of distant atoms with a high fidelity and purity. In addition, the present scheme can also be generalized to prepare the N-partite W state of distant atoms.展开更多
The emergence of millimeter-scale soft actuators has signifi-cantly expanded the potential applications in areas such as search and rescue,drug delivery,and human assistance,due to their high flexibility.Despite these...The emergence of millimeter-scale soft actuators has signifi-cantly expanded the potential applications in areas such as search and rescue,drug delivery,and human assistance,due to their high flexibility.Despite these advancements,achieving precise control over the intricate movements of soft crawlers poses a significant challenge.In this study,we have developed an all-optical approach that enables manipulation of propul-sive forces by simultaneously modifying the magnitude and direction of friction forces,thereby enabling complex motions of soft actuators.Importantly,the approach is not constrained by specific actuator shapes,and theoretically,any elongated photothermal actuator can be employed.The actuator was designed with an isosceles trapezoid shape,featuring a top width of 2mm,a bottom width of 4 mm,and a length of 8 mm.Through our,manipulation approach,we showcase a proof-of-concept for complex soft robotic motions,including crawling(achieving speeds of up to 2.25 body lengths per minute),turning,avoiding obstacles,handling and trans-ferring objects approximately twice its own weight,and navi-gating narrow spaces along programmed paths.Our results showcasethis all-optical manipulationapproach as a promising,yet unexplored tool for the precision and wireless control for the development of advanced soft actuators.展开更多
文摘The laser trapping of untransmissive particles are discussed in this paper. Photon can generate the momentum tothe untransmissive particle by diffraction and reflection on the surface of the particles. We tried laser trapping ofuntransmissive particles using an attractive force caused by the diffraction and radiation force caused by reflection.The laser trapping system includes CW YAG laser, which has 1.064 μm in wave length and an optical microscope.The motions of particles were monitored by a CCD camera on the top of the microscope and recordedby PC connected to the CCD camera.
基金Project supported by the National Natural Science Foundation of China （Grant No 10575034）, and the Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics of China （Grant No T152504）.
文摘A single particle magneto-confined in a one-dimensional （1D） quantum wire experiences a harmonic potential, and imposing a sharply focused laser beam on an appropriate site shapes a δ potential. The theoretical investigation has demonstrated that for a sufficiently strong δ pulse the quantum motional stationary state of the particle is one of the eigenstates of the free harmonic oscillator, and it is determined by the site of the laser beam uniquely, namely a quantum state is admissible if and only if the laser site is one of its nodes. The numerical computation shows that all the nodes of the lower energy states with quantum numbers n ≤ 20, except the coordinate origin, are mutually different. So we can manipulate the multiphoton transitions between the quantum states by adjusting the position of the laser δ pulse and realize the transition from an unknown higher excitation state to a required lower energy state.
基金supported by the National Natural Science Foundation of China(Grant Nos.12375244 and 12135009)the Natural Science Foundation of Hunan Province of China(Grant No.2025JJ30002).
文摘Plasma-based optical elements can withstand laser intensities several orders of magnitude higher than traditional optical elements,making them highly promising for manipulating relativistic intensity laser pulses.In this work,we propose and demonstrate a novel microstructured plasma target,inspired by the design of traditional Fresnel zone plates.The specific target structure causes diffraction of the input laser at each zone,resulting in constructive interference and facilitating effective focusing of the input laser pulse.Three-dimensional particle-in-cell simulation results show that the microstructured plasma target can focus Gaussian laser pulses with an intensity of the order of 10^(22) W/cm^(2)to an intensity exceeding 10^(24) W/cm^(2)with the laser focus spot size approaching the diffraction limit of-0.73μm and laser fluence enhancement by a factor of 46.It is also found that when the microstructured plasma target is modified into a reflective element,laser intensities up to 10^(25) W/cm^(2)may be achieved.This extremely high-intensity tightly focused laser pulse can trigger intense photon radiation when interacting with targets,(e.g.,wire plasma targets),with potential applications in laboratory astrophysics,as well as providing the opportunity to explore phenomena such as vacuum birefringence and quantum electrodynamical cascades.
基金This work was supported by the National Natural Science Foundation of China under Grant Nos. 11564041, 11747096, 11165015, 11264042, 11465020, and 61465013 the Project of Jilin Science and Technology Development for Lead- ing Talent of Science and Technology Innovation in Middle and Young and Team Project under Grant No. 20160519022JH+1 种基金 China Postdoctoral Science Foundation under Grant Nos. 2017M612411, 2018Tl10735 the Education Department Foundation of Henan Province under Grant No. 18A140009.
文摘We propose a scheme for generating an entangled state for three atoms trapped in separate optical cavities that are coupled to each other through two optical fibers based on coherent driving and dissi- pation, which are induced by the classical fields and the decay of non-local bosonic modes, respectively. In our scheme, the interaction time need not be controlled strictly in the overall dynamics process, and the cavity field decay can be changed into a vital resource. The numerical simulation shows that the fidelity of the target state is insensitive to atomic spontaneous emission, and our scheme is good enough to generate the W state of distant atoms with a high fidelity and purity. In addition, the present scheme can also be generalized to prepare the N-partite W state of distant atoms.
基金supported by the National Natural Science Foundation of China [62105090,22275048,22411530048]the Fundamental Research Funds for the Central Universities [JZ2023YQTD0074]+2 种基金the National Key R&D Program of China [2021YFF0502700]Anhui Provincial Natural Science Foundation [2008085J22]the USTC Research Funds of the Double First-Class Initiative [YD2340002009].
文摘The emergence of millimeter-scale soft actuators has signifi-cantly expanded the potential applications in areas such as search and rescue,drug delivery,and human assistance,due to their high flexibility.Despite these advancements,achieving precise control over the intricate movements of soft crawlers poses a significant challenge.In this study,we have developed an all-optical approach that enables manipulation of propul-sive forces by simultaneously modifying the magnitude and direction of friction forces,thereby enabling complex motions of soft actuators.Importantly,the approach is not constrained by specific actuator shapes,and theoretically,any elongated photothermal actuator can be employed.The actuator was designed with an isosceles trapezoid shape,featuring a top width of 2mm,a bottom width of 4 mm,and a length of 8 mm.Through our,manipulation approach,we showcase a proof-of-concept for complex soft robotic motions,including crawling(achieving speeds of up to 2.25 body lengths per minute),turning,avoiding obstacles,handling and trans-ferring objects approximately twice its own weight,and navi-gating narrow spaces along programmed paths.Our results showcasethis all-optical manipulationapproach as a promising,yet unexplored tool for the precision and wireless control for the development of advanced soft actuators.
