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...

Initial alignment plays a pivotal role in inertial navigation systems, as even small orientation errors introduced at startup can significantly degrade subsequent positioning and attitude estimates. In this context, we propose novel inverse method for rotational that leverages the group affine property high-speed computing to accelerate refine process. Adopting Lie theory, derive left-invariant error model geocentric geosynchronous coordinate framework rapidly achieve by integrating forward...

Abstract The vortex beams carrying orbital angular momentum (OAM) are of extreme importance for applications in communication, nanoscience, and optical micro‐manipulation. development dynamically tunable beam generators with compact size is a critical step the realization modulation application. Here, series ultrathin OAM‐tunable polarization‐preserving based on graphene metasurfaces proposed, which offer new scheme to generating variable topological charges at terahertz frequency. By...

Abstract Cylindrical shell fused silica resonators coated with 8 axisymmetric Pb(Zr 0.53 Ti 0.47 )O 3 (PZT) thin film electrodes (thickness ~2 μm ) were reported. The firstly designed and fabricated, then annealed processed by chemical etching to increase mechanical quality factor (Q factor) of resonators, which achieved as high 2.89 million for n = 2 wineglass modes after being PZT electrodes. the driven in experiment simulation fine vibratory shape, demonstrated feasibility cylindrical...

The qualitative and quantitative analysis to trace gas in exhaled human breath has become a promising technique biomedical applications such as disease diagnosis health status monitoring. This paper describes an application of high spectral resolution optical feedback cavity enhanced absorption spectroscopy (OF-CEAS) for ammonia detection breath, the main interference gases CO2 H2O are approximately eliminated at same time. With appropriate feedback, fibered distributed (DFB) diode laser...

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...

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...

A scalable square high voltage pulse generator, which has the properties of fast rise time, fall powerful driving capability, and long lifetime, is presented in this paper by utilizing solid state circuitry. totem-pole topology designed to supply a capability for electro-optic (EO) crystal capacitive load. Power MOSFETs are configured series sustain voltage, proper circuits introduced specific configurations. 3000 V generator with ∼49.04 ns time ∼10.40 output waveform presented. This kind...

A spectral ripple effect observed in fold-type continuous-wave cavity ring down spectroscopy is described and studied. Its period was measured as ∼0.02 cm−1 a 49.1 cm long V-shaped glass ceramics cavity. To find its origin, various losses of high-reflectivity coating their relations to the optical field cavity, especially inside folding mirror coating, have been discussed analyzed according interference theory matrix calculation method. It found that mainly comes from an at between direct...

Abstract The Q factors of fused silica cylindrical shell resonators reaching 25 million is reported. finite element method employed to analyze the anchor loss and chemical etching used reduce surface resonators. Two with same processing parameters are etched for 13 rounds each round set as 5 min. After etching, roughness, resonant frequencies two measured. have both exceeded million, level that hemispherical Results also indicate not related their roughness. This study shows potential...

By utilizing the novel coordinate system for Gaussian beam reflection and generalized ray matrix spherical mirror reflection, sensitivity factors SD1, ST1, SD2 ST2 influenced by both radial axial displacements of a in nonplanar ring resonator have been obtained. Besides, singular points different kinds non-planar resonators under conditions incident angle A ranging from 0° to 45° or total rotation ρ 360° also obtained through analysis determinant coefficient linear equations. The this paper...

A developed spectrometer based on optical-feedback cavity ring-down spectroscopy (OF-CRDS) has been demonstrated with a distributed feedback laser diode and V-shaped glass ceramic cavity. The is coupled to the cavity, which creates an absorption path length greater than 2.8 km, resonance between frequency modes realized by modulating instead of tuning wavelength obtain higher resolution. noise-equivalent coefficient ~2.6 × 10(-8) cm(-1)Hz(-1/2) (1σ) determined spectral resolution ~0.003...

The inhomogeneity of high-reflectivity mirror coatings is a potential error source in the application cavity ringdown technique. Here, times for different transverse modes were recorded. Together with observed spatial distribution these can be used to approximately locate position coating defects. A simple model based on weighted sum Hermite-Gaussian mode functions explain experimental results.

A typical optomechanical system is a cavity with one movable mirror and fixed mirror. However, this configuration has been considered incapable of integrating sensitive mechanical elements while maintaining high finesse. Although the membrane-in-the-middle solution seems to be able overcome contradiction, it introduces additional components that will lead unexpected insertion loss, resulting in reduced quality. Here we propose Fabry-Perot composed an ultrathin suspended Si3N4 metasurface...