Equilibrium orientations of oblate spheroidal particles in single tightly focused Gaussian beams

Cao, Yongyin; Song, Wenhe; Ding, Weiqiang; Sun, Fangkui; Zhu, Tongtong

doi:10.1364/oe.22.018113

Cited by 12 publications

(6 citation statements)

References 27 publications

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“…Higher topological charges of the optical vortex lead to larger bright rings 112 ; hence, shorter nanowires cannot be rotated in the dark core of the optical vortex. More generally, an unsymmetric object, such as a nanorod or an oblate spheroid 136 , 137 , 138 , may experience torque (in addition to an optical force) when illuminated by a Gaussian beam (without AM) because the force distribution inside the object is inhomogeneous. Certainly, the torque will vanish when the equilibrium orientation and position are reached.…”

Section: Non-conservative Forces and Optical Torquementioning

confidence: 99%

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

et al. 2017

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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.

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Section: Non-conservative Forces and Optical Torquementioning

confidence: 99%

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

et al. 2017

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“…Although the sensitivity and instability of the gyroscopes are not ideal at present, the performance of the gyroscopes can be greatly improved by laser cooling, customized levitated rotors, and enhanced optical trap stiffness [40][41][42] , thus providing new sensing technology for inertial navigation. These experiments are implemented in a free space optical system; however, the presented optically levitated gyroscope has the potential to be realized on a chip [43][44][45] , and hybrid methods can be used to calculate the optical force and torque in an integrated system 46,47 .…”

Section: Discussionmentioning

confidence: 99%

Optically levitated micro gyroscopes with an MHz rotational vaterite rotor

Zeng,

Xu,

et al. 2024

Microsyst Nanoeng

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The field of levitated optomechanics has experienced significant advancements in manipulating the translational and rotational dynamics of optically levitated particles and exploring their sensing applications. The concept of using optically levitated particles as gyroscopes to measure angular motion has long been explored but has not yet been proven either theoretically or experimentally. In this study, we present the first rotor gyroscope based on optically levitated high-speed rotating particles. The gyroscope is composed of a micrometer-size ellipsoidal vaterite particle that is driven to rotate at MHz frequencies in a vacuum environment. When an external angular velocity is input, the optical axis deviates from its initial position, resulting in changes in the frequency and amplitude of the rotational signal. By analyzing these changes, the angular velocity of the input can be accurately detected, making it the smallest rotor gyroscope in the world. The angular rate bias instability of the gyroscope is measured to be 0.08°/s and can be further improved to as low as 10−9°/h theoretically by cooling the motion and increasing the angular moment of the levitated particle. Our work opens a new application paradigm for levitated optomechanical systems and may pave the way for the development of quantum rotor gyroscopes.

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“…In contrast to the use of circularly polarized or vortex beam, the torque induced by the misalignment between the linearly polarized laser field and optical axis of the trapped particle is insusceptible to ambient viscosity and therefore can generate synchronized particle rotation with the rotating linear polarization [17][18][19] . However, it is still limited in achieving particle rotation based on linear polarization modulation in optical tweezers that are continuous, hopping-free, and high-speed simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Robust and high‐speed rotation control in optical tweezers by using polarization synthesis based on heterodyne interference

Liu

Dong

Yang

et al. 2020

OEA

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The rotation control of particles in optical tweezers is often subject to the spin or orbit angular momentum induced optical torque, which is susceptible to the mechanical and morphological properties of individual particle. Here we report on a robust and high-speed rotation control in optical tweezers by using a novel linear polarization synthesis based on optical heterodyne interference between two circularly polarized lights with opposite handedness. The synthesized linear polarization can be rotated in a hopping-free scheme at arbitrary speed determined electronically by the heterodyne frequency between two laser fields. The experimental demonstration of a trapped vaterite particle in water shows that the precisely controlled rotation frequency of 300 Hz can be achieved. The proposed method will find promising applications in optically driven micro-gears, fluidic pumps and rotational micro-rheology.

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Equilibrium orientations of oblate spheroidal particles in single tightly focused Gaussian beams

Cited by 12 publications

References 27 publications

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

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

Optically levitated micro gyroscopes with an MHz rotational vaterite rotor

Robust and high‐speed rotation control in optical tweezers by using polarization synthesis based on heterodyne interference

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