Abstract Phonon lasers, which exploit coherent amplifications of phonons, are a means to explore nonlinear phononics, image nanomaterial structures and operate phononic devices. Recently, phonon laser governed by dispersive optomechanical coupling has been demonstrated levitating nanosphere in an optical tweezer. Such levitated devices, with minimal noise high vacuum, can allow flexible control large-mass objects without any internal discrete energy levels. However, it is challenging achieve...

Realizing optical trapping enhancement is crucial in biomedicine, fundamental physics, and precision measurement. Taking the metamaterials with artificially engineered permittivity as photonic force probes tweezers will offer unprecedented opportunities for trap enhancement. However, it usually involves multi-parameter optimization requires lengthy calculations; thereby few studies remain despite decades of research on tweezers. Here, we introduce a deep learning (DL) model to attack this...

<title>Abstract</title> The dual-fiber optical tweezers have become widespread in trapping, assembling, and sensing due to their simple fabrication process flexible operation. However, the miniaturization integration of displacement measurement paths remain challenging. Here, we propose experimentally demonstrate an structured-light (SLD) method tailored for tweezers. A key component split-waveplate is integrated onto fiber end via coating etching SLD method. etched another single mode form...

Abstract The dual-fiber optical tweezers have become widespread in trapping, assembling, and sensing due to their simple fabrication process flexible operation. However, the miniaturization integration of displacement measurement paths remain challenging. Here, we propose experimentally demonstrate an structured-light (SLD) method tailored for tweezers. A key component split-waveplate is integrated onto fiber end via coating etching SLD method. etched another single mode form tweezers, which...

Displacement measurement using a D-shaped mirror is key technology in optical tweezers, which have emerged as an important tool for precision measurement. In this paper, we first study the influences of installation errors on displacement The calibration factor and sensitivity different parameters are quantified. results show that variation obeys cosine curve with angle error, increases exponentially translation error. Besides, find error will also lead to crosstalk between transverse axial...

Optical trapping and manipulating nanoparticles are essential tools for interrogating biomedicine at the limits of space time. Typically, silica or polystyrene microspheres used as photonic force probes. However, adapting those probes to organic solvents is an ongoing challenge due limited solvent compatibility low refractive index mismatch. Here we report on optical enhancement that utilizes ZrO2@TiO2 core-shell nanoparticles. We experimentally demonstrate 450-nm-diameter achieve lateral...

Structured-light displacement detection method is an innovative approach with extremely high sensitivity for measuring the of a levitated particle. This scheme includes two key components, split-waveplate (SWP) and single-mode fiber. In this work, we further investigated influence SWP installation on regarding detection. The results indicate that increases expanding offset in effective range. addition, found has significant tolerance rate, extensive range 5%-25%. However, excessive can...

Phonon lasers, as mechanical analogues of optical are unique tools for not only fundamental studies phononics but also diverse applications such acoustic imaging and force sensing. Very recently, by levitating a micro-size sphere in an tweezer, higher-order harmonics were observed the phonon-lasing regime, first step towards nonlinear levitated optomechanics [Nat. Phys. 19, 414 (2023)]. However, both lasing strengths quality factors typically very low, thus severely hindering their...

Intracavity optical tweezers have been proposed and demonstrated recently, which allows orders-of-magnitude higher confinement with lower-numerical-aperture lens lower laser power in contrast to the standard tweezers. We further investigate its characteristics about position stability of trapped particles. The dependence radial axial on intensity acting particle 10-µm diameter intracavity are compared experimentally. Result shows that can make stronger under condition good trap operation,...

Force detection with high sensitivity is of paramount importance in many fields study, from gravitational wave to investigations surface forces. Here, we propose and demonstrate a force-sensing method based on gain-enhanced nonlinearity nonlinear phonon laser. Experimental simulation results show that the input force leads frequency shift laser, due nonlinearity. In addition, further investigate influences pumping power, numerical aperture, microsphere's refractive index performance this...

High-resolution displacement detection can be achieved by analyzing the scattered light of trapping beams from particle in optical tweezers. In some applications where and detecting must separated, a beam introduced for independent measurement. However, focus possibly deviates center particle, which will affect performance detection. Here, we detect utilizing forward particle. The effects lateral axial offsets between on are analyzed simulation experiment. These results show that decrease...

The displacement measurement of the levitated particle is essential in optical tweezers vacuum. However, crosstalk between radial axes often occurs and will deteriorate precision. Common methods are proposed to align coordinate systems motion measurement, but few have considered polarizations trapping beam possible control. Here single SiO2 particles with a diameter 200nm trapped single-beam Balanced detectors D-shaped mirrors used measure particle's displacements. As expected, coefficient...

Single beam intracavity optical tweezers characterizes a novel trapping scheme where the laser operation is nonlinearly coupled to motion of trapped particle. Here, we first present and establish physical model from completely new perspective describe this coupling mechanism, using transfer matrices calculate loss free-space path then extracting scattering that caused by 3D motions Based on model, discuss equilibrium position in single tweezers. The influences numerical aperture, pumping...

Optical pulling forces, which can pull objects in the source direction, have emerged as an intensively explored field recent years. Conventionally, optical forces exerted on be achieved by tailoring properties of electromagnetic field, surrounding environment, or particles themselves. Recently, idea applying conventional lenses prisms photonic probes has been proposed to realize force. However, their sizes are far beyond scope manipulation. Here, we design a chiral metalens probe generate...

Phonon lasers, coherent oscillations of phonons, have gradually become one the emerging frontiers in last decades, and promising applications quantum sensing, information processing, precise measurement. Recently, phonon lasers based on dissipative coupling been realized an active levitated optomechanical (LOM) system for first time. Here, we further investigated characteristics laser above regarding oscillator amplitude linewidth. We established both experimental a physical model laser. On...

悬浮光力传感技术利用真空环境的光阱实现对微纳尺度机械振子的悬浮和囚禁，将待测物理量转换为光悬浮机械振子运动参数的变化，理论上该振子与外部环境热噪声和振动完全隔绝，具有极高的测量分辨率潜力和易于小型化的独特优势。该技术在精密测量、微观热力学研究、暗物质观测、宏观量子态操控等领域具有广阔的应用前景。首先，阐述了悬浮光力系统中光力与光阱的基础概念和力学测量等基本理论；其次，介绍了其中初始起支、光力增强、位移测量、输出信号标定和等效反馈冷却等关键技术的研究进展，对比分析各子技术的特点，随后列举了悬浮光力传感技术在极弱力、加速度、微观质量、电学量、力矩等物理量测量中的典型应用；最后，总结了该技术的发展趋势，并提出相关建议。

Recently single-beam intracavity optical tweezers have been reported and achieved orders-of-magnitude higher confinement than standard tweezers. However, there is only one feedback loop between the trapped particle's three-dimensional position scattering loss of laser. That leads to coupling effect radial axial motion, aggravates efficiency. Here, we present demonstrate dual-beam trap enabling independent self-feedback control particle, through offsetting foci clockwise counter-clockwise...

The accuracy of long-term position detection in dual-fiber optical trap is limited by low-frequency noise. We propose a technique that can reduce such A system for using quadrant photodiode built. transmission light from the trapped particle detected two photodiodes. normalized differential signal lights demonstrated to carry noise caused asymmetric laser power fluctuation irradiating microsphere, which proved dominate By subtracting this difference signal, noise-reduction capability...

We present a method for measuring the van der Waals force between two microspheres based on photonic microscopy. trapped microsphere as probe by optical tweezers. The restricted Brownian motion of Gaussian distribution could be found in this system. vibration center was affected when target closer to probe. measured at different separation pair microspheres. Based this, measurement realized with high precision. Our can realize direct without using variation rules it. This results simple...

<title>Abstract</title> Optical frequency combs have received increasing attention, thanks to their fundamental importance in optical computing, communication, sensing and metrology. Recently, thermal phonon counterparts of shown ~10² comb teeth ~10³ spacing, limited the high-frequency range over 100 kHz. In contrast, we report first truly coherent acoustic (AFC), with simultaneous giant enhancements number reaching record 10^4, covering six orders magnitude frequency;...

Active cavity optomechanical system provides an invaluable physical platform for optomechanics research, particularly those involving dissipative coupling, which holds significant potential advancing the field of quantum physics. In our previous work, active levitated was established first time [ Nat. Phys 19 , 414 ( 2023 ) 10.1038/s41567-022-01857-9 ]. Here we report a gain-enhanced suspended based on coupling between SiN membrane and intracavity laser. This has high strength is widely...