The scaling down of switching media encounters high leakage current in the traditional oxide material based memristors, resulting power consumption chips. Two-dimensional (2D) materials promise an ultimate device to atomic layer thickness. Herein, black phosphorus (BP) and its self-assembly phosphorous memristors are constructed, which leverages on/off ratio operation oxides low 2D with performance. exhibit reproducible reliable characteristics >107 data retention >104 s....

Automatically measuring canopy characteristics is an essential step for tree-specific management of a grove. Alaser scanning system and corresponding algorithms were developed potential use in measurement tree height,width, volume. Tests with fixed-length PVC pipes demonstrated that the had accuracies 97% length measurementsin three perpendicular directions coefficients variation (CV) less than 4%. Volume rectangularbox gave CV 5.4% relative error 4.4%. Spatial resolution was estimated to be...

This study used a laser scanning system to quantify foliage density of citrus trees. The calculations werebased on the sensor-canopy distance measurements and canopy boundary-smoothing algorithm. Ten trees withdifferent densities were scanned by system, calculated results compared with correspondingvisual assessments tree densities. Overall, visual had good correlation (R2 = 0.96;RMSE 6.1%). Laser also repeatability, an average coefficient variation lessthan 3%.

We proposed a method to design ternary optical element in order achieve needle of super-resolution longitudinally polarized beam with ultra-long depth focus, and obtained size 0.3995λ focus 12.83λ after focusing modulated, radially Bessel–Gaussian an aplanatic lens numerical aperture 0.95. The algorithm we used the is based on axial uniformity focal region, which allows rapid searching speeds excellent performance. ratio pupil radius waist was set as 0.57, making peak intensity incident...

Abstract High-speed maskless nanolithography is experimentally achieved on AgInSbTe thin films. The lithography was carried out in air at room temperature, with a GaN diode laser (λ = 405 nm), and large sample disk of diameter 120 mm. normal width the written features measures 46 ± 5 nm, about 1/12 diffraction allowed smallest light spot, speed reaches 6 ~ 8 m/s, tens times faster than traditional writing methods. resolution instantaneously tunable by adjusting power. reason behind...

The AgInSbTe phase change thin films are very important as optical recording and the super-resolution mask materials in high density information storage. In this work, effective nonlinear absorption coefficients of amorphous crystalline were measured by open-mode Z-scan method no evidence refraction was found closed-mode measurement. coefficient βeff is 7.53×10−3 m/W photon-absorption number n 1.722; 3.5×10−2 m/W, which an order lager than that state, value 1.7011. giant nonlinearity results...

We report the giant optical nonlinear absorption and refraction of Sb2Te3 phase change materials at low laser irradiation intensities. The coefficients reach up to −6.63×10−2 m/W 2.606×10−9 m2/W, respectively. first principles calculation indicates that stems from band filling effect photon induced free carriers under irradiation. band-gap shrinking results in a positive thermo-optic coefficient, thus refraction. numerical are generally correlated with experimental findings z-scan...

For achieving high-resolution nanostructures for next-generation diffractive optical elements (DOEs) using an environmentally friendly process, electrochemical development strategy is proposed and developed AgInSbTe-based laser heat-mode resist (AIST-LHR). Based on the electrical resistivity difference of amorphous crystalline phases this resist, etching selectivity ratio ≈30:1 (i.e., etch between ones) achieved through oxidation Fe3+ ions with assisted pitting activation Cl- in acid medium....

In this work, the optical nonlinear absorption characteristics of crystalline Ge2Sb2Te5 thin films were investigated by performing z-scan measurements with nanosecond laser pulse. The experimental results showed that saturable coefficient was as large –10−2 m/W for excitation intensity lower than 0.17 GW/m2. changed to reverse-saturable a about + 10−2 at above To explore internal mechanisms, first-principle theory employed calculate electronic structure, and five-level structure suitable...

Slit Streak Tube Imaging Lidar (STIL) is a promising imaging system as its high frame rate and good image quality. As important applications, the depth under water to detect underwater target near coast less than 20m. It can effectively indemnify safety of ships. We use Lidar, including laser whose wavelength 532nm energy one pulse 20mJ. Through outfield experiment on sea, we discussed optical properties surface distinguished two targets with distance more 10cm in image. Also get which 6m...

A flash imaging lidar based on a multiple-streak tube is presented in this paper; fiber remapping optics maps light from an area the focal plane of lens to multiple rows fibers streak tube’s photocathode. The system contains tube, laser, transmitting and receiving telescope, optical fibers, CCD capture stripe images phosphor screen. Data processing yields 48 × 48-pixel intensity range for each laser pulse. An experiment test property carried out laboratory; are gained by image remapping,...

The temperature evolution of several important thermal properties crystalline InSb semiconductor is reported systematically. Results show that the specific heat and expansion coefficient remain virtually unchanged upon heating, whereas diffusivity conductivity gradually decrease with increasing temperature. conductivities from phonons, electrons, photon radiations are investigated, respectively. Analytical results indicate phonons dominant when between 300 K 800 K. commonly used parameters...

Industrial approaches to improve lithographic resolution usually rely upon short-wavelength laser or charged particles of even shorter wavelengths. However, nanoscale lithography with visible light is more effective for practical applications because its low cost, easy operation, and so on. In the current work, a technical scheme optical nonlinear saturable absorption effect induce nanobump pattern structures proposed. The theoretical simulation indicates that spot size can be squeezed...

Abstract The tensile plastic deformation of dendrite-reinforced Ti-based metallic glass composites (MGCs) was investigated. It found that there is a critical normalized strain-hardening rate (NSHR) determines the stability MGCs: if NSHR larger than value, MGCs will be stable, i.e. necking and strain localization can effectively suppressed, resulting in homogeneous elongation. In addition, dendrite-reinforce are verified as being intrinsically ductile, used good coatings for improving surface...

In traditional optical exposure lithography, the feature size is restricted by Abbe limit, and it difficult to obtain patterns with a smaller or larger than spot itself. Herein, laser‐assisted thermal lithography technique reported where can be arbitrarily tuned changed, not limited size. The minimum of obtained 90 nm, which ≈1/7 laser (0.62 μm). corresponding aspect ratio ≈1:1. maximum 2.7 μm, ≈30 times A variety multiscale multifunctional structures different sizes are successfully through...

In laser direct writing lithography, there is not any image information from the sample surface, which makes it difficult to find position of focal plane. To overcome problem, an autofocusing through crosshair projection method proposed in this work. The on reticle inserted into lighting path and imaged onto surface. addition increases meeting requirement for focusing improving environment. Furthermore, work presents what we believe be a new division curve based range perpendicular feature...

In this work, we propose nonlinear absorption and melt-ablation threshold characteristics induced subwavelength direct laser writing. The writing materials need to have two features: one is strong absorption, the other characteristics. According of AgInSbTe thin films, effective energy spot calculated. results indicate that full width at half maximum about 2/5 original spot. If only intensity above 80% can induce melt-ablation, mark size or linewidth be reduced 0.14λ/NA (NA denotes numerical...