Abstract As an important green energy in our life, natural wind is widely applied to generate electricity. In this work, a bionic triboelectric nanogenerator tree composed of supercells with cell I leaf and II stem designed for harvesting by utilizing the coupling effect contact electrification electrostatic induction. At speed 11 m s −1 , fabricated produces open‐circuit voltage 330 V short‐circuit current 59.6 µA. The corresponding output power 3.6 mW at matched resistance 60 MΩ, 145...

A ring-shaped random laser in momentum space is designed by directly coupling a with commercial optical fiber. By using simple approach of selectively coating the gain layer on surface fiber, red and yellow lasers are respectively achieved low threshold values good emission direction due to guiding role fibers. The unique mechanism leads ring shape space, which an excellent illuminating source for high-quality imaging extremely speckle noise. More importantly, triple-state color-switchable...

Line width-tunable lasers have wide applications in the fields of high-resolution spectroscopy, optical communications, and other industry scientific research. Here, manipulating plasmonic scattering metal particles with plenty nanogaps is proposed as an effective method to achieve line random lasers. Assisted by nonlinear effect surrounding medium, multiscale material demonstrates transition from local large-scale profile increasing pump power density. Based on these two processes, can be...

The color and/or chromaticity controllability of random lasing is a key factor to promote practical applications lasers as high luminance sources for speckle-free imaging. Here, white coherent with tunable obtained by using broadband enhancement Au-Ag nanowires scatterers and the resonance energy transfer process between different dyes in capillary microfluidic channel. Red, green blue are separately fabricated low thresholds, benefiting from plasmonic nanogaps nanotips distribution sizes...

Abstract Programmable random lasing pulses are highly desired due to their promising applications in information security, flexible encoding systems, and smart imaging. However, the fixed scattering configuration hinders realization. Herein, a programmable laser is designed dynamically regulate through introducing an external waveguide structure with feedback. Liquid solid film lasers thus separately achieved. Most importantly, various pulse time series of can be flexibly realized by...

Tomography plays an important role in characterizing the three-dimensional structure of samples within specialized scenarios. In paper, a masked attention network is presented to eliminate interference from different layers sample, substantially enhancing resolution for photon-level single-pixel tomographic imaging. The simulation and experimental results have demonstrated that axial lateral imaging system can be improved by about 3 2 times respectively, with sampling rate 3.0 %. scheme...

Abstract Random lasers with low spatial coherence have important potential applications in speckle‐free imaging and displaying. Here, an angular spectra (AS) tunable random laser is proposed through directly coupling a microcavity commercial optical fiber. The local in‐plane AS distributions of the lasing can be separately tuned by selectively using filtering, free transmission, intensity modulation. obtained has characteristics non‐polarization ring distribution tunability. unique...

Random lasing with special structured light field has broad application prospects in various fields. However, the complex spatial modes of random increase difficulty regulation and limit its practical application. Here, a vortex dynamically tunable wavelength orbital angular momentum is proposed based on microfluidic channel. Different color lasers are integrated into same channel for coarse control emission wavelengths from 462 to 685 nm by controlling liquid flow. A special-shape cavity...

Abstract Single‐pixel imaging technology can capture images at wavelengths outside the reach of conventional focal plane array detectors. However, limited image quality and lengthy computational times for iterative reconstruction still hinder its practical application. Recently, single‐pixel based on deep learning has attracted a lot attention due to exceptional fast speed. In this review, an overview current status, latest advancements technologies in field are provided. Initially,...

Abstract Surface‐enhanced Raman scattering (SERS) is a useful detection technique for molecule recognition. However, the relative difficulty in producing low‐cost highly active SERS substrates large quantities hinders their practical implementation. Here, fast and facile approach using one‐step solution‐phase synthesis proposed to directly achieve fibrous by uniformly densely growing silver nanoflowers on reduced graphene oxide fibers within several minutes. Attributed abundance of nanogaps...

In this study, spatial coherence tunable random lasing is proposed by designing a laser with separate coupling configuration between the gain medium and scattering part. By using polymer dispersion liquid crystal (PDLC) film coefficient for supplying feedback output modification, red, green blue lasers are obtained. applying or removing electric field to manipulate intensity of PDLC film, these then switched high low state. This work demonstrates that controlling external an effective method lasing.

Chromaticity-tunable random lasers (RLs) have wide applications in laser display and imaging. However, the achievable chromaticity range poses challenges due to their inherent randomness inevitable loss. Here, an ultrabroadband chromaticity-programmable RL has been demonstrated via waveguide-assisted pumping strategy. The unique configuration with destroyed waveguide supplies excellent platform for achieving full color lasing through cascade process. Random tunable wavelengths spanning...

As a key element in optical systems, broadband and omnidirectional polarization beam splitter has been long desired. Here, based on anisotropic metamaterials, perfect polarizing is theoretically designed for the extremely broad frequency angle bands without energy loss. When an electromagnetic wave incident splitter, transverse magnetic-polarized component suffers total reflection, while electric-polarized completely transmitted within range [-90°, 90°] white light. This study provides new...

In this paper, a single-photon single-pixel dual-wavelength imaging technology based on frequency spectral harmonics extraction is proposed. Using the independent repetition frequencies of pulsed light as multiplexed signals, reconstructed image with optimal quality obtained via extracting sum intensities first 7 harmonics. Meanwhile, post-pulse and fluctuation noise are effectively eliminated by applying preprocessing to photon counting sequence, reducing crosstalk 2.29 × 10 −4 . Moreover,...

随机激光器因其具有较低的空间相干性、设计灵活、结构简单等优势在无散斑成像、生物传感、信息安全、光电器件设计等领域有很好的应用前景。近年来，研究者越来越重视对随机激光器输出性能的调控，以进一步满足其在不同领域的实际应用需要。因此，深入理解随机激光的工作机制，总结随机激光光场的调控方法，对该领域的发展具有重要的指导意义。本文首先回顾了随机激光器的发展历程，讨论了随机激光器的工作机制，系统地综述了输出性能可调控的随机激光器的研究进展。最后提出了随机激光器在不同领域的应用前景和挑战，并对随机激光的性能调控和应用进行了展望。

Random Lasers An angular-spectra-tunable random laser based on controlling the coupling length of lasing along a commercial optical fiber is proposed by Zhaona Wang and co-workers in article number 2200054. The with ring angular spectra that obtained has promise for use as an illumination source speckle-free biological imaging high contrast, applications such onion epidermal cells without need dying process.

Linewidth-tunable lasers have great application requirements in the fields of high-resolution spectroscopy, optical communications and other industry scientific research. Here, switchable plasmonic scattering metal particles with plenty nanogaps is proposed as an effective method to achieve linewidth-tunable random lasers. By using nonlinear effect environment medium, demonstrate transition from local high spatial frequency traditional Mie free detail information increasing pump power...

A color-switchable random laser is designed through directly coupling with a commercial optical fiber. By using simple approach of selectively coating the gain layer on surface fiber, red and yellow lasers are respectively achieved low threshold good emission direction due to guiding role fibers. Moreover, unique mechanism leads lasing ring-shape in momentum space, indicating an excellent illuminating source for high-quality imaging extremely speckle noise. More importantly, different colors...

Random lasers with low spatial coherence have important potential applications in high quality imaging and displaying. Here, a random laser tunable angular spectra is proposed fabricated through directly coupling an asymmetric microcavity commercial optical fiber. The designed demonstrates pumping direction-independence property working threshold, good storage stability.More importantly, the spectrum can be adjusted by different microcavities on fiber, output lasing ring-shape momentum space...

Programmable random lasing pulses are highly desired due to their promising applications in information security, flexible encoding system, and smart imaging. However, the fixed scattering configuration hinders realization. Herein, a programmable laser is proposed fabricated based on external waveguide-assisted feedback. The various pulse time series of can be flexibly realized by switching adhesion/separation state between gain destroyed waveguide structure further built dynamic optical...