Author Affiliations
Abstract
1 State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
2 College of Communication Engineering, Jilin University, Changchun 130012, China
3 State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130012, China
4 College of Information Technology, Jilin Agricultural University, Changchun 130118, China
In this Letter, we have demonstrated significant electric field induced (EFI) optical rectification (OR) effects existing in the surface layers of germanium (Ge) and measured the distributions of EFI OR signals along the normal directions of surface layers of Ge samples. Based on the experimental results, the ratios of the two effective second-order susceptibility components χzzz(2eff)/χzxx(2eff) for Ge(001), Ge(110), and Ge(111) surface layers can be estimated to be about 0.92, 0.91, and 1.07, respectively. The results indicate that the EFI OR can be used for analyzing the properties on surface layers of Ge, which has potential applications in Ge photonics and optoelectronics.
240.4350 Nonlinear optics at surfaces 190.4350 Nonlinear optics at surfaces Chinese Optics Letters
2018, 16(10): 102401
Author Affiliations
Abstract
1 State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
2 College of Communication Engineering, Jilin University, Changchun 130012, China
3 College of Information Technology, Jilin Agricultural University, Changchun 130118, China
4 State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
The depth profile of electric-field-induced (EFI) optical rectification (OR) and EFI Pockels effect (PE) in a Si(110) crystal are investigated. The results show that EFI OR and PE signals are very sensitive to the electric field strength in the surface layers of the Si crystal. Theoretical formulas that include the electric field parameters and the widths of the space-charge region are presented and agreed very well with the experimental results. The experiments and simulations indicate that EFI OR and PE are potential methods for researching the surface/interface properties along the depth direction in centrosymmetric crystals such as Si.
240.4350 Nonlinear optics at surfaces 190.4350 Nonlinear optics at surfaces 190.4720 Optical nonlinearities of condensed matter Chinese Optics Letters
2017, 15(6): 062401
Author Affiliations
Abstract
1 State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
2 Department of Applied Physics, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
3 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
4 General Research Institute for Nonferrous Metals, Beijing 100088, China
In this Letter, silver (Ag) hierarchical nanostructures grown on black silicon (BS) are used as the catalyst and a surface-enhanced Raman scattering (SERS) detector integrated in a microfluid. The BS is fabricated via femtosecond laser ablation in an atmosphere of sulfur hexafluoride, and then hydrogenated with hydrofluoric acid. As formed, the BS substrate directly acts as a reducing template to grow silver hierarchical nano-structures. Particularly, Ag-BS composite micro/nano-structures can be in-situ constructed in silicon-based microchannels. These structures simultaneously serve as integrated catalytic reactors and a SERS substrate for sensing. The sensitivity is tested to be as low as 10 8 mol/L using Rhodamine 6G.
240.6695 Surface-enhanced Raman scattering 160.3380 Laser materials Chinese Optics Letters
2015, 13(10): 102401
1 西安邮电大学 通信与信息工程学院, 陕西 西安 710061
2 西安交通大学 电子与信息工程学院, 陕西 西安 710049
针对LTE-A(长期演进技术的后续演进)技术的RRM(无线资源管理)及优化问题, 提出一种在LTE-A系统中基于RRM功能博弈的无线资源分配策略。其主要思想是根据RRM中的两个功能——无线接纳控制和无线承载控制之间的竞合关系, 建立博弈模型, 通过求取博弈模型的纳什均衡, 实现系统服务量的最大化, 以达到运营商经济利益和用户满意度的有效统一。
长期演进技术的后续演进 无线资源管理 博弈论 无线接纳控制 无线承载控制 LTE-A RRM game theory radio admission control radio bearer control
1 西安邮电学院 通信工程系，陕西 西安 710061
2 西安交通大学 电信学院，陕西 西安 710049
在多粒度光网络中，为了满足可变的业务带宽请求，降低高带宽请求业务的阻塞率，减少低带宽请求业务接入时造成的网络资源浪费，提出了一种基于分层虚拓扑的跨粒度层增强生存性的方法。该方法首先根据波长粒度和波带粒度设计了一种分层虚拓扑，然后根据业务请求带宽在各粒度层上或跨粒度层计算工作路径和保护路径。分析结果表明，该方法可有效提高资源利用率，降低阻塞率。
分层虚拓扑 跨粒度层 多粒度光网络 生存性 layered virtual topology trans-granularity layer multi-granularity optical network survivability
1 西安邮电学院 通信工程系， 陕西 西安 710061
2 西安交通大学, 陕西 西安 710049
文章提出一种多阶梯度链路抽象方法以及在多域路由中辅助此方法来对连接建立请求进行判断的处理模式。使用该链路抽象方法以及辅助处理模式可以近似无差错地体现原始信息，为多域路由提供准确的信息。仿真分析表明，使用多阶梯度链路抽象方法和辅助处理，可以大大减小连接建立请求的误接受和误拒绝的概率，提高网络资源利用率和网络整体性能。
多域光网络 拓扑抽象 多阶梯度 multi-domain optical network topological aggregation multi-order gradient
文章介绍了光传送网承载传送多协议标签交换(T-MPLS)的结构, 分析了解决基于T-MPLS的路由与波长分配(RWA)问题所采用的算法的类型。随后, 将基于T-MPLS的RWA问题分为路由选择和波长分配两个子问题, 结合T-MPLS技术的特点分别从支持流量工程、多域情况、支持组播和支持区分业务等方面进行研究。
路由与波长分配 传送多协议标签交换 光传送网 路由 波长分配 RWA T-MPLS OTN routing wavelength assignment
1 Xi'an Jiaotong University, Shaan'xi 710061, P.R. China
2 Xi'an Institute of Posts and Telecom, Xi'an, Shaan'xi 710061, P.R. China
