- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Thermally-stable large strain in Bi(Mn0.5Ti0.5)O3 modified 0.8Bi0.5Na0.5TiO3-0.2Bi0.5K0.5TiO3 ceramics
摘要： A N U S C RIP T (1-x)[0.8Bi0.5Na0.5TiO3-0.2Bi0.5K0.5TiO3]-xBi(Mn0.5Ti0.5)O3 (x = 0 ~ 0.06, BNKMT100x) lead-free ferroelectric ceramics were prepared via solid state reaction method. Bi(Mn0.5Ti0.5)O3 induces a structure transition from rhombohedral-tetragonal morphotropic phases to pseudo-cubic phase. Moreover, the wide range of compositions within x = 0.03 ~ 0.055 exhibit large strain of 0.31% ~ 0.41% and electrostrictive coefficient of 0.027 ~ 0.041 m4/C2. Especially, at x = 0.04, the large strain and electrostrictive coefficient are nearly temperature-independent in the range of 25 ~ 100 °C. The impedance analysis shows the large strain and electrostrictive coefficient originate from polar nanoregions response due to the addition of Bi(Mn0.5Ti0.5)O3.
关键词： large strain,thermal stability,composition-insensitivity,lead-free,electric property
更新于2025-09-23 15:23:52
-
A pH-insensitive near-infrared fluorescent probe for wash-free lysosome-specific tracking with long time during physiological and pathological processes
摘要： A novel dicyanomethylene-4H-pyran based lysosome-specific near-infrared (NIR) probe, DCM-ML, is reported. It exhibits very weak fluorescence (Ф=0.007) in aqueous solution due to the energy relaxation from intramolecular rotation; but a large "off-on" NIR emission (20-folds) after specifically labeling lysosomes due to the local high viscosity instead of the local pH by both one- and two-photon excitation microscopy. Therefore, the imaging ability of DCM-ML will not confront the problems suffered by the currently used and reported pH-dependent lysosome probes (e.g., once lysosomal pH increases, their fluorescence gets quenched); The pH-independent feature of DCM-ML is further demonstrated to be a great advantage for tracing lysosomes’ movements in a relatively long time, even during cellular processes when lysosomes are suffered from external stimulations that induce pH increase and apoptosis. In addition to the characteristics of pH-insensitivity and "off-on" NIR emission, DCM-ML also possesses characteristics of excellent membrane permeability, high selectivity, low cytotoxicity, good photostability and large Stokes shift (> 200 nm), which qualify it as a superior wash-free NIR probe for tracking dynamic changes of lysosomes under both physiological and toxicological conditions. Hence, we believe DCM-ML may find a great potential of application in the future.
关键词： pH-insensitivity,Long-term tracking,Wash-free,"Off-on",Lysosome-specific imaging,Near-infrared
更新于2025-09-23 15:22:29
-
[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Electron emission from nanocrystalline silicon planar cathode in gaseous environments
摘要： The insensitivity of planar cathodes based on oxidized nanocrystalline silicon to ambient gas pressure is investigated. We demonstrate that the device operates normally even in the ambient gas pressure of 1×10 -2 Pa. The result of the energy analysis of emitted electrons suggests that emitted increase under hydrogen loss electrons with at atmosphere. less energy
关键词： environmental insensitivity,planar cathode,nanocrystalline silicon
更新于2025-09-23 15:21:21
-
Controlled Phase Gate Protocol for Neutral Atoms via Off-Resonant Modulated Driving
摘要： Neutral-atom arrays serve as an ideal platform to study quantum simulation and quantum logic gates, where intense efforts have been devoted to improving the fidelity of two-qubit gates. We report our recent findings in constructing a different type of two-qubit controlled phase gate protocol with neutral atoms enabled by the Rydberg blockade, which aims at both robustness and high fidelity. It relies upon a modulated driving pulse with a specially tailored smooth waveform to gain appropriate phase accumulations for quantum gates. The major features include finishing a gate operation within a single pulse, not necessarily requiring individual site addressing, not being sensitive to the exact value of the blockade shift, and suppressing the population leakage error and rotation error. Building upon this progress, we further develop an upgrade in the form of dual-pulse off-resonant modulated driving with the major distinct feature of Doppler insensitivity, in order to address the challenge to the fidelity of two-qubit gates caused by residual thermal motion of the cold atoms. In principle, the gate fidelity remains reasonably high over a relatively significant velocity range of the qubit atoms. Moreover, we anticipate that this will inspire future improvements in gate protocols for other types of qubit platforms, and the strategies used here may find applications in the area of quantum optimal control.
关键词： Doppler insensitivity,controlled phase gate,quantum logic gates,neutral-atom arrays,Rydberg blockade,quantum simulation
更新于2025-09-23 15:19:57
-
Lithography-Free Planar Band-Pass Reflective Color Filter Using A Series Connection of Cavities
摘要： In this article, a lithography-free multilayer based color filter is realized using a proper series connection of two cavities that shows relatively high efficiency, high color purity, and a wide view angle. The proposed structure is a metal-insulator-metal-insulator-semiconductor (MIMIS) design. To optimize the device performance, at the first step, transfer matrix method (TMM) modeling is utilized to find the right choices of materials for each layer. Simulations are carried out later on to optimize the geometries of the layers to obtain our desired colors. Finally, the optimized devices are fabricated and experimentally characterized to evaluate our modelling findings. The characterization results of the fabricated samples prove the successful formation of efficient and wide view angle color filters. Unlike previously reported FP based designs that act as a band-stop filter in reflection mode (absorbing a narrow frequency range and reflecting the rest of the spectrum), this design generates a specific color by reflecting a narrow spectral range and absorbing the rest of the spectrum. The findings of this work can be extended to other multilayer structures where an efficient connection of cavities in a tandem scheme can propose functionalities that cannot be realized with conventional FP resonators.
关键词： lithography-free,Fabry-Perot,MIMIS,color filter,RGB colors,angular insensitivity,reflection mode
更新于2025-09-19 17:15:36
-
Ultraviolet to near infrared titanium nitride broadband plasmonic absorber
摘要： In this paper, we theoretically design and numerically verify a broadband plasmonic absorber that works continuously in ultraviolet to near-infrared region. Different from the traditional metal-insulator-metal (MIM) three-layer structure, our perfect absorber is based on insulator-metal-insulator-metal (IMIM) four-layer structure. This perfect absorber owns a 280 nm ultra-thin thickness, a configuration of refractory metal titanium nitride and high-melting-point insulator silica equips it with strong thermal stability. The novel titanium nitride ring-square array layer combines the absorption of different wavelength bands so that the absorber can achieves a continuous absorption of more than 90% from wavelength 200–1200 nm. Using Finite-difference time-domain (FDTD) method, we get a calculated average absorption rate as 94.85%, which includes a 99.40% maximum absorption at wavelength 270 nm and a 90.30% minimum absorption at 390 nm. In addition, this perfect absorber demonstrates polarization independence under normal incidence and large incident angle insensitivity under oblique incidence, which has significant application potentials in many areas such as solar energy collection, photothermal conversion, and invisibility cloak.
关键词： Broadband absorber,Ultraviolet to near infrared,Polarization independence,Plasmonic,Large incident angle insensitivity
更新于2025-09-19 17:13:59
-
Quinonoid Zwitterion: an Amphiphilic Cathode Interlayer with Initial Thickness-Insensitive and Self-Organizing Properties for Inverted Polymer Solar Cells
摘要： Orthogonal solvent processability is generally considered one of the key requirements for an efficient interfacial material. Here we showed that in inverted polymer solar cells (PSCs), solvent orthogonality is not required for an effective and reliable cathode interlayer. A quinonoid zwitterionic molecule with amphiphilic property (dissolved in both methanol and o-dichlorobenzene (o-DCB)) named ZW-Bu was first applied as the cathode interlayer in the inverted PSCs. For three different photoactive systems, the devices with ZW-Bu CBL exhibited better performance than those with commonly used ZnO CBL. Most importantly, the device efficiency was fairly insensitive to the initial thickness of ZW-Bu. In addition, due to the high surface energy of ZW-Bu film, it was successfully used as self-organized CBL in P3HT:PC61BM system, yielding a desirable efficiency compared to the PSCs fabricated via layer-by-layer deposition method.
关键词： polymer solar cells,non-orthogonal solvent,self-organization,quinonoid zwitterion,initial thickness-insensitivity
更新于2025-09-12 10:27:22
-
Graphene-embedded broadband tunable metamaterial absorber in terahertz band
摘要： Numerous studies have been conducted to design terahertz broadband metamaterial absorbers for various applications such as electromagnetic stealth, photodetection, and broadband communications. And it remains a hot research topic to design metamaterial absorber (MA) to achieve broadband absorption while maintaining a wide range of tunability. Here, we present a novel design of graphene-embedded metamaterial functioning as a broadband tunable absorber based on the field reinforcement effect and plasmon resonance of graphene. With a stacked configuration, the absorptivity of the MA proposed in this paper can be as high as 90% in a wide range of 1.2 THz. By comparative analysis, we exhibit that the MA shows a relatively wider absorption bandwidth than the one without the embedded graphene, which discloses the significance of integrating graphene layer in our design. The detailed numerical calculations of the surface currents and electric field distributions are presented in this paper to better uncover the physical mechanisms of the broadband and multi-band absorption. Moreover, further numerical calculations show that the designed MA also demonstrates several other excellent properties such as tunability, polarization insensitivity, incident angle insensitivity and outstanding structural parameters tolerance. The proposed graphene-embedded MA can be used in various promising applications, like smart sensors, broadband absorber and imaging devices.
关键词： insensitivity,field reinforcement effect,tunability,plasmon resonance,metamaterial absorber,broadband,graphene
更新于2025-09-11 14:15:04
-
An Open-Source Artificial Neural Network Model for Polarization-Insensitive Silicon-on-Insulator Subwavelength Grating Couplers
摘要： We present an open-source deep artificial neural network (ANN) model for the accelerated design of polarization-insensitive subwavelength grating (SWG) couplers on the silicon-on-insulator platform. Our model can optimize SWG-based grating couplers for a single fundamental-order polarization, or both, by splitting them counter-directionally at the grating level. Alternating SWG sections are adopted to reduce the reflections (loss) of standard, single-etch devices—further accelerating the design time by eliminating the need to process a second etch. The model of this device is trained by a dense uniform dataset of finite-difference time-domain (FDTD) optical simulations. Our approach requires the FDTD simulations to be made up front, where the resulting ANN model is made openly available for the rapid, software-free design of future standard photonic devices, which may require slightly different design parameters (e.g., fiber angle, center wavelength, polarization) for their specific application. By transforming the nonlinear input–output relationship of the device into a matrix of learned weights, a set of simple linear algebraic and nonlinear activation calculations can be made to predict the device outputs 1,830 times faster than numerical simulations, within 93.2% accuracy of the simulations.
关键词： subwavelength devices,machine learning,Silicon photonics,polarization insensitivity,grating couplers,artificial neural networks
更新于2025-09-04 15:30:14
-
Refractory Ultra-Broadband Perfect Absorber from Visible to Near-Infrared
摘要： The spectral range of solar radiation observed on the earth is approximately 295 to 2500 nm. How to widen the absorption band of the plasmonic absorber in this range has become a hot issue in recent years. In this paper, we propose a highly applicable refractory perfect absorber with an elliptical titanium nanodisk array based on a silica–titanium–silica–titanium four-layer structure. Through theoretical design and numerical demonstration, the interaction of surface plasmon resonance with the Fabry–Perot cavity resonance results in high absorption characteristics. Our investigations illustrate that it can achieve ultra-broadband absorption above 90% from a visible 550-nm wavelength to a near-infrared 2200-nm wavelength continuously. In particular, a continuous 712-nm broadband perfect absorption of up to 99% is achieved from wavelengths from 1013 to 1725 nm. The air mass 1.5 solar simulation from a ?nite-difference time domain demonstrates that this absorber can provide an average absorption rate of 93.26% from wavelengths of 295 to 2500 nm, which can absorb solar radiation ef?ciently on the earth. Because of the high melting point of Ti material and the symmetrical structure of this device, this perfect absorber has excellent thermal stability, polarization independence, and large incident-angle insensitivity. Hence, it can be used for solar cells, thermal emitters, and infrared detection with further investigation.
关键词： large incident-angle insensitivity,ultra-broadband,perfect absorber,refractory
更新于2025-09-04 15:30:14