Author Affiliations
Abstract
1 Tianjin Key Laboratory of Film Electronic & Communication Devices, School of Electronics Information Engineering, Tianjin University of Technology, Tianjin 300384, China
2 Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China
In this paper, the positive influence of apodization weighting method on frequency characteristics of surface acoustic wave (SAW) temperature sensor is investigated. Simulation and experiment results show that side lobe suppression abilities of the sensor can be improved by using apodization weighting which is based on Chebyshev window. Meanwhile, we find that the side lobe of the sensor can be further restrained, when the dummy electrodes are removed. Frequency- temperature characteristics of the devices are independent of the inclusion of dummy electrodes. The apodization weighted SAW temperature sensor shows great application potential in occasions with strong electromagnetic interference.
光电子快报（英文版）
2015, 11(2): 88
1 天津大学 精密仪器与光电子工程学院 激光与光电子研究所, 天津 300072
2 天津大学 光电信息技术科学教育部重点实验室, 天津 300072
3 天津理工大学 电子信息工程学院, 天津 300084
通过调整结构参数, 优化设计了一种高非线性高双折射的光子晶体光纤(PCF)。该光纤的包层结构由大小不同的圆形空气孔按六边形排列, 纤芯中心沿着x轴引入两个椭圆空气孔。采用全矢量有限元法, 并以完美匹配层作为边界条件分析了该光纤结构的模场分布、有效折射率、有效面积、非线性系数及双折射特性, 并且分析了光纤结构参数对这些特性的影响。分析表明, 调节最内层纤芯周围的大空气孔和椭圆空气孔的大小可有效地控制非线性系数和双折射特性。数值分析显示: 适当地调节结构参数后, 该光纤在波长1.55 μm处的非线性系数最大值可达53.5 W-1·km-1 ; 双折射系数为1.092 9×10-2, 比传统光纤高两个数量级。该光纤在对于非线性和双折射需求高的通信系统中具有好的应用前景。
实芯光子晶体光纤 双折射 非线性系数 有效面积 模场分布 有限元法 solid-core photonic crystal fiber birefringence nonlinear coefficient effective area mode profile Finite Element Method(FEM)
Author Affiliations
Abstract
Tianjin Key Laboratory of Film Electronic and Communication Device, School of Electronics Information Engineering,Tianjin University of Technology, Tianjin 300384, China
Flexible TiO2 memory devices are fabricated on a plastic substrate at room temperature. The metal-insulator-metal (MIM) structure is grown on polyimide (PI). Several metals with different ductilities, such as Al, W, Cu and Ag, are selected as electrode. The test results show that the samples have stable resistive switching behaviors, and the electric characteristics can stay stable even after the radius of substrate is bent up to 10 mm. After 103times of substrate bending, the memory cells with W as bottom electrode on PI still show stable resistive switching characteristics and low switching voltages. The set voltage and reset voltage can be as low as 0.9 V and 0.3 V, respectively.
光电子快报（英文版）
2013, 9(4): 263
Author Affiliations
Abstract
1 Institute of Laser & Optoelectronics, College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
2 Key Laboratory of Optoelectronics Information Technology, Ministry of Education, Tianjin University, Tianjin 300072, China
3 Tianjin Key Laboratory of Film Electronic and Communication Device, School of Electronics Information Engineering,Tianjin University of Technology, Tianjin 300384, China
A tunable thermo-optic intensity-modulated switch is investigated theoretically and numerically. It is based on the infiltration of temperature-sensitive mixture liquids into index-guiding photonic crystal fibers (PCFs). The switching function attributes to the thermo-optic effect of the effective refractive index of the cladding. The simulation illustrates that the switch presents a tunable transition point according to the concentration of the mixture liquids, and the on-off switching functionality can be realized within a narrow temperature range of 2 oC. The switches have wide application for innovative all-in-fiber optical communication and logic devices.
光电子快报（英文版）
2012, 8(6): 430
