湖南师范大学物理与电子科学学院, 湖南 长沙 410081
利用光生伏特效应设计一种新型的光控双向栅极可控硅晶闸管(LDGSCR)防护器件,研究光照对静电放电(ESD)维持窗口的调控作用。使用光生电流来模拟光照控制ESD设计窗口的物理效应,实现一种光控器件的可控硅晶闸管(SCR)宏观模型。在1.5 V的电压模拟光照下,该模型的维持电流相比无光条件增加35 mA,表明使用光照来调整ESD的维持窗口可以降低被保护电路发生闩锁的风险。采用0.18 μm BCD工艺制造LDGSCR器件并进行测试,测试结果与模型仿真结果之间的最大误差仅为0.09 V和0.004 A。验证表明,该宏观模型可以消除传统耦合晶体管电路模型中存在的收敛性问题,极大减少开发光控SCR器件新型结构所需的时间和精力。
光电子学 光控器件 静电放电防护器件 光电流 维持窗口 紧凑宏观模型 光学学报
2021, 41(11): 1125001
Author Affiliations
Abstract
1 Jiangxi Engineering Laboratory for Optoelectronics Testing Technology, Nanchang Hangkong University, Nanchang 330063, China
2 National Engineering Laboratory for Nondestructive testing and Optoelectric Sensing Technology and Application, Nanchang Hangkong University, Nanchang 330063, China
The scattering properties of ZnO nanospheres with four different particle diameters of 10, 50, 100, and 200 nm suspended in water are investigated theoretical and experimentally in the spectral range of the entire visible range and part of the near-infrared region. The scattering properties of ZnO nanospheres suspended in water are described by employing three main parameters: the angular distribution of the scattering intensity I, the scattering extinction coefficient αscat, and the scattering cross section σscat. The results indicate that (i) at a certain wavelength, the angular distribution of the scattering intensity appears as an obviously forward-propagating feature, and the forward-scattering intensity is dominant gradually when the particle diameter increases from 10 to 200 nm, and (ii) the scattering extinction coefficient and cross section can be determined by using the measured transmittance changes of a pure water sample and a given ZnO sample; they all are shown to be dependent on the particle size and incident wavelength. The experimental results of four different scattering samples agree well with the theoretical predictions within the given wavelength range.
290.5850 Scattering, particles 290.5820 Scattering measurements 290.5825 Scattering theory Chinese Optics Letters
2017, 15(1): 012901
1 南京邮电大学光电工程学院微流控光学技术中心, 江苏 南京 210023
2 南京中兴新通信研究所, 江苏 南京 210012
基于微流控技术提出了一种新型可调光衰减器核心芯片结构，利用微流体和可压缩空气实现光衰减的可控调节，并基于此核心芯片设计了两种应用不同驱动技术的微流控光衰减器。通过高斯光束传播理论、亥姆霍兹方程、光场耦合理论与Mathematics软件分析了光衰减器内部光场分布特性，考虑了流体端面衍射影响，给出了流体端面位置与衰减量的关系及响应时间等性能参数。理论表明基于微流控技术的可调光衰减器衰减范围大于50 dB，系统响应时间约为0.01 s，具有衰减范围大、响应快、插入损耗小、回波损耗大的优点。所提出的光衰减器为寻求小体积、高性能、易集成、灵活可调的新型光通讯器件提供了新的思路。
光学器件 微流体 可调光衰减器 流体 衰减量
