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...

Sun-driven photocatalytic hydrogen production reaction opens up possibilities for renewable energy systems. The is the mass and conversion process between materials environment. Thus, proper physical field introduction desired serious consideration to improve flow process. Here, we propose a piezo-enhanced system based on ultrasound realize adjustable built-in electric favoring photo-induced carriers' transfer. As proof of concept, piezo-photocatalyst prepared through hydrothermal method. On...

Abstract Doppler velocity log (DVL) is usually employed to suppress the divergency of Strapdown Inertial Navigation System (SINS) in underwater navigation, which not concealable due high transmittance for acoustic wave water. To conduct navigation task with concealment, a differential laser velocimeter (LDV) working at water track mode integrated SINS this paper. The developed LDV measures advance carrier respect surrounding scenario advantages real-time performance, update rate, light...

The cylindrical resonator gyroscope (CRG) is a typical Coriolis vibratory whose performance determined by the Q factor and frequency mismatch of resonator. Enhancing crucial for improving rate sensitivity noise CRG. In this paper, first time, monolithic fused silica with approaching 8 × 10⁵ (ring-down time over 1 min) reported. made low internal friction high isotropy, diameter 25 mm center 3974.35 Hz. structure briefly introduced, then experimental non-contact characterization method...

We propose and demonstrate a novel optical orbital rotation technique for trapped particle in transversely misaligned dual-fiber trap. The frequency can be controlled by varying the power of two counterpropagating beams. theoretically analyze an force field exerted on 10-μm-diameter polystyrene simulate its dynamic trajectory within geometric optics regime framework. Results show that is realized with vortex distribution inherently stems from depends configuration dual-beam trap rather than...

Developments in diesel engines and gasoline direct injection (GDI) have spawned the requirement of soot oxidation catalysts that work well both NO + O2 O2. In this study, we found supporting Pt on zeolites such as H-ZSM5 USY may receive better oxidizers than commercial Pt/Al2O3 catalyst. Durability tests indicate that, even after hydrothermal aging at 800 °C, aged Pt/H-ZSM5 is still a oxidizer O2, Pt/USY exhibits best activity Further explorations reveal NO2 preferential adsorption dependent...

A comprehensive dynamics analysis of microsphere has been presented in a dual-beam fiber-optic trap with transverse offset. As the offset distance between two counterpropagating beams increases, motion type starts capture, then spiral motion, orbital rotation, and ends escape. We analyze transformation process mechanism four types based on ray optics approximation. Dynamic simulations show that existence critical distances at which different transform. The result is an important step toward...

The hemispherical resonator gyroscope (HRG) has attracted the interest of world inertial navigation community because its exceptional performance, ultra-high reliability and potential to be miniaturized. These devices achieve their best performance when differences in frequencies two degenerate working modes are eliminated. Mechanical treatment, laser ablation, ion-beams etching, etc., have all been applied for frequency tuning resonators, however, they either require costly equipment...

In optical traps the position of a trapped bead is usually determined by measuring intensity distribution forward-scattered light and back-scattered light. this paper we demonstrate that can be using side-scattered A quadrant photodiode used to monitor an optically object in dual-beam fiber-optic trap measurement shifts back focal plane objective perpendicular propagating beam. An approximated model based on ray optics presented with numerical results describe use for detection. The...

Abstract A new method to measure the spin polarization of optically pumped alkali-metal atoms is demonstrated. Unlike conventional using far-detuned probe light, near-resonant light with two specific frequencies was chosen. Because Faraday rotation angle this approach can be orders magnitude greater than that method, more sensitive polarization. Based on results experimental scheme, measurements are found in good agreement theoretical predictions, thereby demonstrating feasibility approach.

The spin and orbital rotation of the red blood cell (RBC) are achieved simultaneously by introducing a transverse offset to dual-beam fibre-optic trap. motion type captured RBC could be controlled adjusting distance. When distance is relatively small, observed in trap centre, with frequency increasing linearly Once above critical value, will rotate along an elliptic orbit, together motion. both decrease increased This technique allows mixing viewing living cells from different perspectives...

The orbital rotation is an important type of motion trapped particles apart from translation and spin rotation. It could be realized by introducing a transverse offset to the dual-beam fiber-optic trap. characteristics (e.g. perimeter frequency) have been analyzed in this article. We demonstrate influences distance, beam waist separation light power, radius microsphere both experimental numerical work. experiment results, i.e. frequency as functions these parameters, are consistent with...

Abstract We propose and analyze a superluminal ring laser gyroscope (RLG) using multilayer optical coatings with huge group delay (GD). This GD assisted RLG can measure the absolute rotation giant sensitivity-enhancement factor of ~10 3 ; while, broadband FWHM enhancement reach 20 MHz. is based on traditional minimal re-engineering beneficial for miniaturization according to theoretical calculation. The idea as fast-light medium will shed lights design application sensors.

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...

Magnetic field gradients reduce the transverse relaxation time of nuclear spins, which usually degrades sensitivity atomic sensors based on spins. We demonstrate improved magnetic gradient compensation by applying first-order and second-order simultaneously in a cubic vapor cell containing 87Rb 129Xe gas. Compared with only compensation, is up to 4.3 times longer when both compensating gradients, indicates that total greatly suppressed joint our experiment. The induced polarized static...

We report a novel method of measuring the spin polarization alkali-metal atoms by detecting NMR frequency shifts noble gases. calculated profile 87Rb D1 line absorption cross sections. then measured sample cell, from which we number densities at different temperatures. Then resulted and its degrees The behavior versus temperature in experiment was consistent with theoretical calculation, may be used as compensative signal for NMRG closed-loop control system.