Novel CMOS image sensor pixel to improve charge transfer speed and efficiency by overlapping gate and temporary storage diffusing node

A novel CMOS image sensor(CIS) pinned photodiode(PPD) pixel, named as O-T pixel, is proposed and investigated by TCAD simulations. Compared with the conventional PPD pixel, the proposed pixel features the overlapping gate(OG)and the temporary storage diffusing(TSD) region, based on which the several-nanosecond-level charge transfer could be achieved and the complete charge transfer from the PPD to the floating node(FD) could be realized. And systematic analyses of the influence of the doping conditions of the proposed processes, the OG length, and the photodiode length on the transfer performances of the proposed pixel are conducted. Optimized simulation results show that the total charge transfer time could reach about 5.862 ns from the photodiode to the sensed node and the corresponding charge transfer efficiency could reach as high as 99.995% in the proposed pixel with 10 μm long photodiode and 2.22 μm long OG. These results demonstrate a great potential of the proposed pixel in high-speed applications.     

基于大涡模拟下风力机翼型非定常转捩流动的动态模态分解分析

翼型绕翼流动对风力机整机性能产生重要影响.本文基于大涡模拟方法,得到风力机翼型非定常转捩流动.通过对压力流场的动态模态分解(DMD)分析,发现翼型层流分离泡的生成和发展为流动主要非定常特征,且该特征具有主要频率.预估得到高增长率T-S扰动波频率与DMD模态频率接近,发现高频变化的分离泡由边界层分离点下游不远处的T-S扰...     

0.2 nm带宽滤光片的制备以及退火温度对其形貌和性能的影响

近红外波长为1.064 μm的激光是激光测距、自由空间光通信和空间光学遥感等应用中的主要激光光源之一.窄带滤光片是抑制背景光干扰的关键元件之一,目前大部分滤光片的半峰全宽为几纳米.本文研制了中心波长为(1064±0.05) nm、半峰全宽为0.19 nm、峰值透过率可达70.2％的带通滤光片,并考察了不同温度(100,...     

Classical-Noise-Free Sensing Based on Quantum Correlation Measurement

Quantum sensing,using quantum properties of sensors,can enhance resolution,precision,and sensitivity of imaging,spectroscopy,and detection.An intriguing question is:Can the quantum nature(quantumness)of sensors and targets be exploited to enable schemes that are not possible for classical probes or classical targets?Here we show that measurement of the quantum correlations of a quantum target indeed allows for sensing schemes that have no classical counterparts.As a concrete example,in the case that the second-order classical correlation of a quantum target could be totally concealed by non-stationary classical noise,the higher-order quantum correlations can single out a quantum target from the classical noise background,regardless of the spectrum,statistics,or intensity of the noise.Hence a classical-noise-free sensing scheme is proposed.This finding suggests that the quantumness of sensors and targets is still to be explored to realize the full potential of quantum sensing.New opportunities include sensitivity beyond classical approaches,non-classical correlations as a new approach to quantum many-body physics,loophole-free tests of the quantum foundation,et cetera.     

时间关联单光子计数中的多光子污染

从推导光子时间概率密度分布函数出发,研究了时间关联单光子计数法测量荧光寿命中,多光子修正函数的特征及其对测量误差的影响,并给出了定理关系式。     

Quantum Discord for Two-Qubit System in a Symmetry-Broken Environment

In contrast with the entanglement, we study the quantum discord dynamics of the two-qubit system in a symmetry-broken environment consisting of a fermionic bath. The quantum discord decay induced by the bath is analysed. By considering the two qubits that are initially prepared in the different X-states, we find that the behaviors of quantum discord and entanglement are different, the robustness of quantum discord depends on the initial state prepared in.     

衍射光栅光谱级数与实验误差的关系研究

从理论上证明了光栅衍射的光谱级数与实验绝对误差的关系,得到二级衍射谱线的精度高于一级衍射谱线的精度,从而能降低实验误差。依据实验数据,计算得到衍射光谱级数不同时的波长,实验结果与理论结论是相吻合的。     

白光LED用Ca7（SiO4）2Cl6∶Eu2+荧光粉的光谱性能研究

通过高温固相法制备了用于紫外激发白光LED的蓝绿色Ca7(SiO4)2Cl6∶Eu2+荧光粉,并对样品进行了XRD分析和发光性能测试。结果表明,合成的样品为单相Ca7(SiO4)2Cl6;在紫外光激发下,样品的发射谱包括418和502nm两个发射峰。分别监测这两个发射峰,得到了峰值位于290和360nm处的两个宽带激发谱,说明Eu2+离子在基质晶格中可能占有两个不同的格位。研究了Eu2+离子浓度对发光强度的影响,最佳掺杂浓度为0.75mol%。结果表明该荧光粉是一种较好的蓝绿色发光材料。     

Large area,rapid growth of two-dimensional ZnO nanosheets and their field emission performances

We demonstrate an improved and rapid method to synthesize uniform two-dimensional ZnO nanosheets at low temperature. These nanosheets can be prepared within an hour. The compositions and morphologies of the nanosheets produced were characterized by SEM, XRD, Raman and photoluminescence analysis. The nanosheets showed reasonably strong electron field emission properties with good reliability. Emission current density close to 0.3 mA/cm² was obtained. The effects of dimensions and morphologies on the field emission performance of the nanosheets are also discussed. PACS 62.23.Kn; 79.70.+q; 81.16.Be