Abstract Acoustic holograms using artificial materials have become an area of intense interest in acoustics due to the great potential various applications such as medical imaging, underwater detection and object manipulation, etc. In this article, a general approach is proposed for designing high‐pixel‐array binary metasurfaces then fabricating intricate ultrathin structures via picosecond laser processing implementing high‐resolution manifold far fields. The angular spectrum propagation...

Nonlocal wavelength-to-time mapping between frequency-entangled photon pairs generated with the process of spontaneous parametric down-conversion is theoretically analyzed and experimentally demonstrated. The spectral filtering pattern experienced by one in pair will be non-locally mapped into time domain when other propagates inside a dispersion-compensation fiber large group velocity dispersion. Our work, for first time, points out that bandwidth pump laser become dominated factor...

In this Letter, a hybrid frequency-time spectrograph combining tunable optical filter and dispersive element is presented for measurement of the spectral properties two-photon state. comparison with previous single-photon utilizing Fourier transformation (DFT) technique, method advanced since it avoids need additional wavelength calibration electronic laser trigger coincidence measurement; therefore, its application extended to continuous wave (CW) pumped sources. The achievable precision...

In this paper, a tunable polarization-dependent terahertz (THz) metamaterial absorber based on liquid crystal (LC) is presented. The measurement results show that absorption peak at 239.5 GHz for TE-polarized wave and 306.6 TM-polarized wave, without exerting the bias voltage LC layer. An increase in affects orientation of molecules causes redshifted resonant frequencies. By adjusting from 0 to 10 V, frequency tunabilities 4.7% 4.1% TE- waves, respectively, were experimentally demonstrated....

With the rapid development of microwave photonics technology, high-speed processing and ultra-weak signal detection capability have become main bottlenecks in many applications. Thanks to extremely low timing jitter properties single-photon detectors, combination classical technology may provide a solution break above bottlenecks. In this paper, we first report novel concept (SP-MWP), SP-MWP system with phase shifting frequency filtering functionalities is demonstrated based on...

The development of raster STM electric lithography has enabled the etching nano/microscale patterns on both few-layer graphene (FLG) and high-depth graphite structures bulk HOPG substrates under ambient conditions. This approach utilises a nanoscale probe tip as machining tool to directly fabricate conductive sample surfaces without need for resists or masks. Compared conventional nano/micro methods, capability ultraaccurate fabrication using this technique is unmatched. resulting FLG...

As one of the tip-based top-down nanoscale machining methods, atomic force microscopy (AFM) electric lithography is capable directly generating flexible nanostructures on conductive or semi-conductive sample surfaces. In this work, distinct fabrication mechanisms and mechanism transition from local anodic oxidation (LAO) to electrical breakdown (BD) in AFM highly oriented pyrolytic graphite surface was studied. We provide direct evidence process through detected current-voltage (I-V) curve....

Bias voltage dependent atomic force microscope (AFM) nanolithography has been widely studied for its potential applications in the fabrication of nanostructures, nano-electronic devices and nano-electromechanical systems (NEMS). In this work, nanometre-scale line patterns by AFM electric lithography was systematically on conductive graphite sample surface ambient conditions. The influences determinative process parameters, involving applied probe tip shape, bias scanning speed, results were...

We observe the optical phase matching between a fiber taper and high-order azimuthal whispering gallery mode (WGM) in water droplet for first time. The eccentricity of separates wavelength modes. evaluate different In experiments, WGM (l-|m|=6) is realized around 1550 nm. lifted modes make high-efficient coupling easier probing light with narrow spectral range. They also have potential applications detecting shape fluctuation droplets.

We report on an edge-emitting diode laser with ultra-narrow twin-lobed far field based a dual-sided Bragg reflection waveguide. Lasers stripe width of 10 m exhibit two stable near-circular beams symmetrically located at about 31 full half maximum (FWHM) 7.2 and 5.4 respectively in the vertical lateral directions. The mechanism behind achievement twin-beam output is presented, symmetry these analyzed by comparing beam FWHM power distribution. Single longitudinal mode operation achieved...

Objectives We aim to build a students' own engagement in original microbiological course-based undergraduate research experience (CUREs) model served two and teaching scientific purposes including literacy skills instructors' role, which could further be applied as contribution broader knowledge conduct novel their future careers. Methods describe student-driven CUREs on the microorganism species female vaginal using general bacterial culture techniques high-throughput 16S rRNA gene amplicon...

Abstract We investigate the bending loss and propagation characterization of hollow pipe polymer terahertz waveguides, based on 3D electromagnetic simulation systematic experiments. Bending attenuation waveguides are investigated for various core diameters radius curvature over a wide frequency range (100‐500 GHz). Our results indicate that with larger or radii suffer lower loss, lowest at near anti‐resonant frequencies, typical values such as constant straight Teflon waveguide low 0.29 m −1...

Summary In recent years, with the increase in number of electric vehicles, retired power batteries, which predominantly include lithium‐ion has surged. Recycling these batteries can reduce environmental pollution and resource waste. However, voltage a single battery is low, multiple need to be connected series satisfy application requirements. This use results inconsistencies cell parameters. As connections increases, this inconsistency problem becomes more prominent, it even decrease...

The quantum eraser effect exemplifies the distinct properties of mechanics that challenge classical intuition and expose wave-particle duality light. This has been extensively explored in various experiments; most these investigations use polarisation to distinguish which path information, less attention paid phase structure is related wavefront photon. In this study, we introduce a theoretical framework for erasure focusses on demonstrate it experimentally. experiment, employ Mach-Zehnder...

This study aims to optimize surface electromyography-based gesture recognition technique, focusing on the impact of muscle fatigue performance. An innovative real-time analysis algorithm is proposed in paper, which can extract features real time and fuse them into hand process. Based self-collected data, this paper applies algorithms such as convolutional neural networks long short-term memory provide an in-depth feature extraction method fatigue, compares performance tasks. The results show...