Content of ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS in our journal

Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For selected: Download citations EndNote Ris BibTeX Toggle thumbnails Select Accelerated generation of holograms with ultra-low memory symmetrically high-compressed look-up table Yan Yang(杨燕), Jianying Zhu(朱建英), Minyuan Sun(孙敏远), and Yong Bi(毕勇) Chin. Phys. B, 2024, 33 (4): 044201.   DOI: 10.1088/1674-1056/ad1e67 Abstract （26）      PDF （1371KB）（3）       Knowledge map    Computer-generated holography technology has been widely applied, and as research in this field deepens, the demand for memory and computational power in small AR and VR devices continues to increase. This paper presents a hologram generation method, i.e., a symmetrically high-compressed look-up table method, which can reduce memory usage by 50%. In offline computing, half of the basic horizontal and vertical modulation factors are stored, halving the memory requirements without affecting inline speed. Currently, its potential extends to various holographic applications, including the production of optical diffraction elements. Select Effectively modulating spatial vortex four-wave mixing in a diamond atomic system Nuo Ba(巴诺), Ming-Qi Jiang(姜明奇), Jin-You Fei(费金友), Dan Wang(王丹), Hai-Lin Jiang(蒋海林), Lei Wang(王磊), and Hai-Hua Wang(王海华) Chin. Phys. B, 2024, 33 (4): 044202.   DOI: 10.1088/1674-1056/ad0771 Abstract （20）      PDF （3440KB）（6）       Knowledge map    Due to the spatial characteristics of orbital angular momentum, vortex fields can be applied in the fields of quantum storage and quantum information. We study the realization of spatially modulated vortex fields based on four-wave mixing in a four-level atomic system with a diamond structure. The intensity and spiral phase of the vortex field are effectively transferred to the generated four-wave mixing field. By changing the detuning of the probe field, the phase and intensity of the generated vertex four-wave mixing field can be changed. When the probe field takes a large detuning value, the spatial distribution of the intensity and phase of the vertex four-wave mixing field can be effectively tuned by adjusting the Rabi frequency or detuning value of the coupled field. At the same time, we also provide a detailed explanation based on the dispersion relationship, and the results agree well with our simulation results. Select Topological edge and corner states of valley photonic crystals with zipper-like boundary conditions Yun-Feng Shen(沈云峰), Xiao-Fang Xu(许孝芳), Ming Sun(孙铭), Wen-Ji Zhou(周文佶), and Ya-Jing Chang(常雅箐) Chin. Phys. B, 2024, 33 (4): 044203.   DOI: 10.1088/1674-1056/ad1e6a Abstract （28）      PDF （4930KB）（6）       Knowledge map    We present a stable valley photonic crystal (VPC) unit cell with C3v symmetric quasi-ring-shaped dielectric columns and realize its topological phase transition by breaking mirror symmetry. Based on this unit cell structure, topological edge states (TESs) and topological corner states (TCSs) are realized. We obtain a new type of wave transmission mode based on photonic crystal zipper-like boundaries and apply it to a beam splitter assembled from rectangular photonic crystals (PCs). The constructed beam splitter structure is compact and possesses frequency separation functions. In addition, we construct a box-shaped triangular PC structures with zipper-like boundaries and discover phenomena of TCSs in the corners, comparing its corner states with those formed by other boundaries. Based on this, we explore the regularities of the electric field patterns of TESs and TCSs, explain the connection between the characteristic frequencies and locality of TCSs, which helps better control photons and ensures low power consumption of the system. Select Sensing the heavy water concentration in an H2O—D2O mixture by solid—solid phononic crystals Mohammadreza Rahimi and Ali Bahrami Chin. Phys. B, 2024, 33 (4): 044301.   DOI: 10.1088/1674-1056/ad0bf5 Abstract （25）      PDF （2551KB）（8）       Knowledge map    A new method based on phononic crystals is presented to detect the concentration of heavy water (D2O) in an H2O—D2O mixture. Results have been obtained and analyzed in the concentration range of 0%—10% and 90%—100% D2O. A proposed structure of tungsten scatterers in an aluminum host is studied. In order to detect the target material, a cavity region is considered as a sound wave resonator in which the target material with different concentrations of D2O is embedded. By changing the concentration of D2O in the H2O—D2O mixture, the resonance frequency undergoes a frequency shift. Each 1% change in D2O concentration in the H2O—D2O mixture causes a frequency change of about 120 Hz. The finite element method is used as the numerical method to calculate and analyze the natural frequencies and transmission spectra of the proposed sensor. The performance evaluation index shows a high Q factor up to 1475758 and a high sensitivity up to 13075, which are acceptable values for sensing purposes. The other figures of merit related to the detection performance also indicate high-quality performance of the designed sensor. Select Passive particles driven by self-propelled particle: The wake effect Kai-Xuan Zheng(郑凯选), Jing-Wen Wang(汪静文), Shi-Feng Wang(王世锋), and De-Ming Nie(聂德明) Chin. Phys. B, 2024, 33 (4): 044501.   DOI: 10.1088/1674-1056/ad1a8d Abstract （21）      PDF （2024KB）（6）       Knowledge map    This work focuses on numerically studying hydrodynamic interaction between a passive particle and a self-propelled particle, termed a squirmer, by using a two-dimensional lattice Boltzmann method (LBM). It is found that the squirmer can capture a passive particle and propel it simultaneously, provided the passive particle is situated within the squirmer's wake. Our research shows that the critical capture distance, which determines whether the particle is captured, primarily depends on the intensity of the squirmer's dipolarity. The stronger dipolarity of squirmer results in an increased critical capture distance. Conversely, the Reynolds number is found to have minimal influence on this interaction. Interestingly, the passive particle, when driven by the squirmer's wake, contributes to a reduction in the squirmer's drag. This results in a mutual acceleration for both particles. Our findings can provide valuable perspectives for formulating the principles of reducing the drag of micro-swimmers and help to achieve the goal of using micro-swimmers to transport goods without physical tethers. Select Effect of granular shape on radial segregation in a two-dimensional drum Yue Xu(徐悦), Ran Li(李然), Zhipeng Chi(迟志鹏), Wenzheng Xiu(修文正), Qicheng Sun(孙其诚), and Hui Yang(杨晖) Chin. Phys. B, 2024, 33 (4): 044502.   DOI: 10.1088/1674-1056/ad1092 Abstract （24）      PDF （3763KB）（6）       Knowledge map    Granular segregation is widely observed in nature and industry. Most research has focused on segregation caused by differences in the size and density of spherical grains. However, due to the fact that grains typically have different shapes, the focus is shifting towards shape segregation. In this study, experiments are conducted by mixing cubic and spherical grains. The results indicate that spherical grains gather at the center and cubic grains are distributed around them, and the degree of segregation is low. Through experiments, a structured analysis of local regions is conducted to explain the inability to form stable segregation patterns with obviously different geometric shapes. Further, through simulations, the reasons for the central and peripheral distributions are explained by comparing velocities and the number of collisions of the grains in the flow layer. Select Molecular dynamics simulation of the flow mechanism of shear-thinning fluids in a microchannel Gang Yang(杨刚), Ting Zheng(郑庭), Qihao Cheng(程启昊), and Huichen Zhang(张会臣) Chin. Phys. B, 2024, 33 (4): 044701.   DOI: 10.1088/1674-1056/ad08a7 Abstract （29）      PDF （2754KB）（4）       Knowledge map    Shear-thinning fluids have been widely used in microfluidic systems, but their internal flow mechanism is still unclear. Therefore, in this paper, molecular dynamics simulations are used to study the laminar flow of shear-thinning fluid in a microchannel. We validated the feasibility of our simulation method by evaluating the mean square displacement and Reynolds number of the solution layers. The results show that the change rule of the fluid system's velocity profile and interaction energy can reflect the shear-thinning characteristics of the fluids. The velocity profile resembles a top-hat shape, intensifying as the fluid's power law index decreases. The interaction energy between the wall and the fluid decreases gradually with increasing velocity, and a high concentration of non-Newtonian fluid reaches a plateau sooner. Moreover, the velocity profile of the fluid is related to the molecule number density distribution and their values are inversely proportional. By analyzing the radial distribution function, we found that the hydrogen bonds between solute and water molecules weaken with the increase in velocity. This observation offers an explanation for the shear-thinning phenomenon of the non-Newtonian flow from a micro perspective. Select Dynamic modeling of cavitation bubble clusters: Effects of evaporation, condensation, and bubble—bubble interaction Long Xu(许龙), Xin-Rui Yao(姚昕锐), and Yang Shen(沈阳) Chin. Phys. B, 2024, 33 (4): 044702.   DOI: 10.1088/1674-1056/ad181f Abstract （17）      PDF （1167KB）（5）       Knowledge map    We present a dynamic model of cavitation bubbles in a cluster, in which the effects of evaporation, condensation, and bubble—bubble interactions are taken into consideration. Under different ultrasound conditions, we examine how the dynamics of cavitation bubbles are affected by several factors, such as the locations of the bubbles, the ambient radius, and the number of bubbles. Herein the variations of bubble radius, energy, temperature, pressure, and the quantity of vapor molecules are analyzed. Our findings reveal that bubble—bubble interactions can restrict the expansion of bubbles, reduce the exchange of energy among vapor molecules, and diminish the maximum internal temperature and pressure when bursting. The ambient radius of bubbles can influence the intensities of their oscillations, with clusters comprised of smaller bubbles creating optimal conditions for generating high-temperature and high-pressure regions. Moreover, an increase in the number of bubbles can further inhibit cavitation activities. The frequency, pressure and waveform of the driving wave can also exert a significant influence on cavitation activities, with rectangular waves enhancing and triangular waves weakening the cavitation of bubbles in the cluster. These results provide a theoretical basis for understanding the dynamics of cavitation bubbles in a bubble cluster, and the factors that affect their behaviors. Select On-chip ultrafast stackable dielectric laser positron accelerator Bin Sun(孙斌), Yangfan He(何阳帆), Chenhao Pan(潘晨浩), Sijie Fan(樊思劼), Du Wang(王度), Shaoyi Wang(王少义), and Zongqing Zhao(赵宗清) Chin. Phys. B, 2024, 33 (3): 034101.   DOI: 10.1088/1674-1056/ad188e Abstract （58）   HTML （0）    PDF （2095KB）（50）       Knowledge map    We present a first on-chip positron accelerator based on dielectric laser acceleration. This innovative approach significantly reduces the physical dimensions of the positron acceleration apparatus, enhancing its feasibility for diverse applications. By utilizing a stacked acceleration structure and far-infrared laser technology, we are able to achieve a seven-stage acceleration structure that surpasses the distance and energy gain of using the previous dielectric laser acceleration methods. Additionally, we are able to compress the positron beam to an ultrafast sub-femtosecond scale during the acceleration process, compared with the traditional methods, the positron beam is compressed to a greater extent. We also demonstrate the robustness of the stacked acceleration structure through the successful acceleration of the positron beam. Select Singular optical propagation properties of two types of one-dimensional anti-PT-symmetric periodic ring optical waveguide networks Yanglong Fan(樊阳龙), Xiangbo Yang(杨湘波), Huada Lian(练华达), Runkai Chen(陈润楷),Pengbo Zhu(朱蓬勃), Dongmei Deng(邓冬梅), Hongzhan Liu(刘宏展), and Zhongchao Wei(韦中超) Chin. Phys. B, 2024, 33 (3): 034201.   DOI: 10.1088/1674-1056/ad12ab Abstract （36）   HTML （0）    PDF （3199KB）（16）       Knowledge map    Two types of one-dimensional (1D) anti-PT-symmetric periodic ring optical waveguide networks, consisting of gain and loss materials, are constructed. The singular optical propagation properties of these networks are investigated. The results show that the system composed of gain materials exhibits characteristics of ultra-strong transmission and bidirectional reflection. Conversely, the system composed of loss materials demonstrates equal transmittance and reflectance at some frequencies. In both the systems, a new type of total reflection phenomenon is observed. When the imaginary part of the refractive indices of waveguide segments is smaller than 10-5, the system shows bidirectional transparency with the transmittance tending to be 1 and reflectivity to be smaller than 10-8 at some bands. When the refractive indices of the waveguide segments are real, the system will be bidirectional transparent at the full band. These findings may deepen the understanding of anti-PT-symmetric optical systems and optical waveguide networks, and possess potential applications in efficient optical energy storage, ultra-sensitive optical filters, ultra-sensitive all-optical switches, integrated optical chips, stealth physics, and so on. Select Simultaneous guidance of electromagnetic and elastic waves via glide symmetry phoxonic crystal waveguides Lin-Lin Lei(雷林霖), Ling-Juan He(何灵娟), Qing-Hua Liao(廖清华), Wen-Xing Liu(刘文兴), and Tian-Bao Yu(于天宝) Chin. Phys. B, 2024, 33 (3): 034202.   DOI: 10.1088/1674-1056/ad0ec7 Abstract （31）   HTML （0）    PDF （6721KB）（34）       Knowledge map    A phoxonic crystal waveguide with the glide symmetry is designed, in which both electromagnetic and elastic waves can propagate along the glide plane at the same time. Due to the glide symmetry, the bands of the phoxonic crystal super-cell degenerate in pairs at the boundary of the Brillouin zone. This is the so-called band-sticking effect and it causes the appearance of gapless guided-modes. By adjusting the magnitude of the glide dislocation the edge bandgaps, the bandgap of the guided-modes at the boundary of the Brillouin zone, can be further adjusted. The photonic and phononic guided-modes can then possess only one mode for a certain frequency with relatively low group velocities, achieving single-mode guided-bands with relatively flat dispersion relationship. In addition, there exists acousto-optic interaction in the cavity constructed by the glide plane. The proposed waveguide has potential applications in the design of novel optomechanical devices. Select A polarization sensitive interferometer: Delta interferometer Chao-Qi Wei(卫超奇), Jian-Bin Liu(刘建彬), Yi-Fei Dong(董翼飞), Yu-Nong Sun(孙雨农), Yu Zhou(周宇), Huai-Bin Zheng(郑淮斌), Yan-Yan Liu(刘严严), Xiu-Sheng Yan(闫秀生), Fu-Li Li(李福利), and Zhuo Xu(徐卓) Chin. Phys. B, 2024, 33 (3): 034203.   DOI: 10.1088/1674-1056/acf996 Abstract （50）   HTML （0）    PDF （966KB）（59）       Knowledge map    A new type of polarization sensitive interferometer is proposed, named the Delta interferometer, inspired by its geometry resembling the Greek letter Delta. The main difference between the Delta interferometer and other existing interferometers, such as Michelson, Mach-Zehnder and Young's double-slit interferometers, is that the two interfering paths are asymmetrical in the Delta interferometer. The visibility of the first-order interference pattern observed in the Delta interferometer is dependent on the polarization of the incidental light. Optical coherence theory is employed to interpret this phenomenon and single-mode continuous-wave laser light is employed to verify the theoretical predictions. The theoretical and experimental results are consistent. The Delta interferometer is a perfect tool to study the reflection of electromagnetic fields in different polarizations and may find applications in polarization-sensitive scenarios. Select Efficient single-pixel imaging encrypted transmission based on 3D Arnold transformation Zhen-Yu Liang(梁振宇), Chao-Jin Wang(王朝瑾), Yang-Yang Wang(王阳阳), Hao-Qi Gao(高皓琪), Dong-Tao Zhu(朱东涛), Hao-Li Xu(许颢砾), and Xing Yang(杨星) Chin. Phys. B, 2024, 33 (3): 034204.   DOI: 10.1088/1674-1056/acf204 Abstract （47）   HTML （0）    PDF （2797KB）（49）       Knowledge map    Single-pixel imaging (SPI) can transform 2D or 3D image data into 1D light signals, which offers promising prospects for image compression and transmission. However, during data communication these light signals in public channels will easily draw the attention of eavesdroppers. Here, we introduce an efficient encryption method for SPI data transmission that uses the 3D Arnold transformation to directly disrupt 1D single-pixel light signals and utilizes the elliptic curve encryption algorithm for key transmission. This encryption scheme immediately employs Hadamard patterns to illuminate the scene and then utilizes the 3D Arnold transformation to permutate the 1D light signal of single-pixel detection. Then the transformation parameters serve as the secret key, while the security of key exchange is guaranteed by an elliptic curve-based key exchange mechanism. Compared with existing encryption schemes, both computer simulations and optical experiments have been conducted to demonstrate that the proposed technique not only enhances the security of encryption but also eliminates the need for complicated pattern scrambling rules. Additionally, this approach solves the problem of secure key transmission, thus ensuring the security of information and the quality of the decrypted images. Select Diffraction deep neural network-based classification for vector vortex beams Yixiang Peng(彭怡翔), Bing Chen(陈兵), Le Wang(王乐), and Shengmei Zhao(赵生妹) Chin. Phys. B, 2024, 33 (3): 034205.   DOI: 10.1088/1674-1056/ad0142 Abstract （43）   HTML （0）    PDF （1189KB）（35）       Knowledge map    The vector vortex beam (VVB) has attracted significant attention due to its intrinsic diversity of information and has found great applications in both classical and quantum communications. However, a VVB is unavoidably affected by atmospheric turbulence (AT) when it propagates through the free-space optical communication environment, which results in detection errors at the receiver. In this paper, we propose a VVB classification scheme to detect VVBs with continuously changing polarization states under AT, where a diffractive deep neural network (DDNN) is designed and trained to classify the intensity distribution of the input distorted VVBs, and the horizontal direction of polarization of the input distorted beam is adopted as the feature for the classification through the DDNN. The numerical simulations and experimental results demonstrate that the proposed scheme has high accuracy in classification tasks. The energy distribution percentage remains above 95% from weak to medium AT, and the classification accuracy can remain above 95% for various strengths of turbulence. It has a faster convergence and better accuracy than that based on a convolutional neural network. Select Enhancing the Goos-Hänchen shift based on quasi-bound states in the continuum through material asymmetric dielectric compound gratings Xiaowei Jiang(江孝伟), Bin Fang(方彬), and Chunlian Zhan(占春连) Chin. Phys. B, 2024, 33 (3): 034206.   DOI: 10.1088/1674-1056/acf661 Abstract （42）   HTML （1）    PDF （3042KB）（10）       Knowledge map    Quasi-bound state in the continuum (QBIC) resonance is gradually attracting attention and being applied in Goos-Hänchen (GH) shift enhancement due to its high quality (Q) factor and superior optical confinement. Currently, symmetry-protected QBIC resonance is often achieved by breaking the geometric symmetry, but few cases are achieved by breaking the material symmetry. This paper proposes a dielectric compound grating to achieve a high Q factor and high-reflection symmetry-protectede QBIC resonance based on material asymmetry. Theoretical calculations show that the symmetry-protected QBIC resonance achieved by material asymmetry can significantly increase the GH shift up to -980 times the resonance wavelength, and the maximum GH shift is located at the reflection peak with unity reflectance. This paper provides a theoretical basis for designing and fabricating high-performance GH shift tunable metasurfaces/dielectric gratings in the future. Select Generation of orbital angular momentum hologram using a modified U-net Zhi-Gang Zheng(郑志刚), Fei-Fei Han(韩菲菲), Le Wang(王乐), and Sheng-Mei Zhao(赵生妹) Chin. Phys. B, 2024, 33 (3): 034207.   DOI: 10.1088/1674-1056/ad12aa Abstract （38）   HTML （0）    PDF （3925KB）（45）       Knowledge map    Orbital angular momentum (OAM) holography has become a promising technique in information encryption, data storage and opto-electronic computing, owing to the infinite topological charge of one single OAM mode and the orthogonality of different OAM modes. In this paper, we propose a novel OAM hologram generation method based on a densely connected U-net (DCU), where the densely connected convolution blocks (DCB) replace the convolution blocks of the U-net. Importantly, the reconstruction process of the OAM hologram is integrated into DCU as its output layer, so as to eliminate the requirement to prepare training data for the OAM hologram, which is required by conventional neural networks through an iterative algorithm. The experimental and simulation results show that the OAM hologram can rapidly be generated with the well-trained DCU, and the reconstructed image's quality from the generated OAM hologram is significantly improved in comparison with those from the Gerchberg-Saxton generation method, the Gerchberg-Saxton based generation method and the U-net method. In addition, a 10-bit OAM multiplexing hologram scheme is numerically demonstrated to have a high capacity with OAM hologram. Select Engineering the spectra of photon triplets generated from micro/nanofiber Chuan Qu(瞿川), Dongqin Guo(郭东琴), Xiaoxiao Li(李笑笑), Zhenqi Liu(刘振旗), Yi Zhao(赵义), Shenghai Zhang(张胜海), and Zhengtong Wei(卫正统) Chin. Phys. B, 2024, 33 (3): 034208.   DOI: 10.1088/1674-1056/ad1c5d Abstract （51）   HTML （0）    PDF （1375KB）（39）       Knowledge map    Quantum light sources are the core resources for photonics-based quantum information processing. We investigate the spectral engineering of photon triplets generated by third-order spontaneous parametric down-conversion in micro/nanofiber. The phase mismatching at one-third pump frequency gives rise to non-degenerate photon triplets, the joint spectral intensity of which has an elliptical locus with a fixed eccentricity of √6/3. Therefore, we propose a frequency-division scheme to separate non-degenerate photon triplets into three channels with high heralding efficiency for the first time. Choosing an appropriate pump wavelength can compensate for the fabrication errors of micro/nanofiber and also generate narrowband, non-degenerate photon triplet sources with a high signal-to-noise ratio. Furthermore, the long-period micro/nanofiber grating introduces a new controllable degree of freedom to tailor phase matching, resulting from the periodic oscillation of dispersion. In this scheme, the wavelength of photon triplets can be flexibly tuned using quasi-phase matching. We study the generation of photon triplets from this novel perspective of spectrum engineering, and we believe that this work will accelerate the practical implementation of photon triplets in quantum information processing. Select Versatile and controlled quantum teleportation network Yao-Yao Zhou(周瑶瑶), Peng-Xian Mei(梅鹏娴), Yan-Hong Liu(刘艳红), Liang Wu(吴量), Yan-Xiang Li(李雁翔), Zhi-Hui Yan(闫智辉), and Xiao-Jun Jia(贾晓军) Chin. Phys. B, 2024, 33 (3): 034209.   DOI: 10.1088/1674-1056/ad1981 Abstract （45）   HTML （0）    PDF （2460KB）（52）       Knowledge map    A quantum teleportation network involving multiple users is essential for future quantum internet. So far, controlled quantum teleportation has been demonstrated in a three-user network. However, versatile and controlled quantum teleportation network involving more users is in demand, which satisfies different combinations of users for practical requirements. Here we propose a highly versatile and controlled teleportation network that can switch among various combinations of different users. We use a single continuous-variable six-partite Greenberger-Horne-Zeilinger (GHZ) state to realize such a task by choosing the different measurement and feedback operations. The controlled teleportation network, which includes one sub-network, two sub-networks and three sub-networks, can be realized for different application of user combinations. Furthermore, the coherent feedback control (CFC) can manipulate and improve the teleportation performance. Our approach is flexible and scalable, and would provide a versatile platform for demonstrations of complex quantum communication and quantum computing protocols. Select On the generation of high-quality Nyquist pulses in mode-locked fiber lasers Yuxuan Ren(任俞宣), Jinman Ge(葛锦蔓), Xiaojun Li(李小军), Junsong Peng(彭俊松), and Heping Zeng(曾和平) Chin. Phys. B, 2024, 33 (3): 034210.   DOI: 10.1088/1674-1056/acfa87 Abstract （54）   HTML （0）    PDF （966KB）（43）       Knowledge map    Nyquist pulses have wide applications in many areas, from electronics to optics. Mode-locked lasers are ideal platforms to generate such pulses. However, how to generate high-quality Nyquist pulses in mode-locked lasers remains elusive. We address this problem by managing different physical effects in mode-locked fiber lasers through extensive numerical simulations. We find that net dispersion, linear loss, gain and filter shaping can affect the quality of Nyquist pulses significantly. We also demonstrate that Nyquist pulses experience similariton shaping due to the nonlinear attractor effect in the gain medium. Our work may contribute to the design of Nyquist pulse sources and enrich the understanding of pulse shaping dynamics in mode-locked lasers. Select Estimating the yield stress of soft materials via laser-induced breakdown spectroscopy Shuhang Gong(龚书航), Yaju Li(李亚举), Dongbin Qian(钱东斌), Jinrui Ye(叶晋瑞), Kou Zhao(赵扣), Qiang Zeng(曾强), Liangwen Chen(陈良文), Shaofeng Zhang(张少锋), Lei Yang(杨磊), and Xinwen Ma(马新文) Chin. Phys. B, 2024, 33 (3): 034211.   DOI: 10.1088/1674-1056/ad12a9 Abstract （27）   HTML （0）    PDF （1284KB）（8）       Knowledge map    Taking three typical soft samples prepared respectively by loose packings of 77-, 95-, and 109-μm copper grains as examples, we perform an experiment to investigate the energy-dependent laser-induced breakdown spectroscopy (LIBS) of soft materials. We discovered a reversal phenomenon in the trend of energy dependence of plasma emission intensity: increasing initially and then decreasing separated by a well-defined critical energy. The trend reversal is attributed to the laser-induced recoil pressure at the critical energy just matching the sample's yield strength. As a result, a one-to-one correspondence can be well established between the samples' yield stress and the critical energy that is easily obtainable from LIBS measurements. This allows us to propose an innovative method for estimating the yield stress of soft materials via LIBS with attractive advantages including in-situ remote detection, real-time data collection, and minimal destructive to sample. page Page 1 of 120 Total 2385 records First page Prev page Next page Last page