Hierarchical Integration of Organic Core/Shell Microwires for Advanced Photonics

The combination of multiple components or structures into integrated micro/nanostructures for practical application has been pursued for many years. Herein, a series of hierarchical organic microwires with branch, core/shell (C/S), and branch C/S structures are successfully constructed based on organic charge transfer (CT) cocrystals with structural similarity and physicochemical tunability. By regulating the intermolecular CT interaction, single microwires and branch microstructures can be integrated into the C/S and branch C/S structures, respectively. Significantly, the integrated branch C/S microwires, with multicolor waveguide behavior and branch structure multichannel waveguide output characteristics, can function as an optical logic gate with multiple encoding features. This work provides useful insights for creating completely new types of organic microstructures for integrated optoelectronics.     

基于十倍光学拉伸的5GHz微波信号模数转换研究(英文)

利用光学时间拉伸法对微波信号进行降频处理,提高了后端电子模数转换器的有效模拟带宽和有效采样速率.设计了一套对5GHz微波信号十倍降频的光学时间拉伸模数转换系统.对色散导致的信号功率损耗特性以及调制引起的谐波失真进行了理论分析和数值仿真,结果表明:当系统带宽为5GHz时,光学时间拉伸引入的信号噪声失真比不会劣化后续电子模数转换器的有效位数,该模数转换系统的有效模带宽可达8GHz,有效采样率为200GS/s.     

Impact of higher order dispersion on Photonically assisted optical millimeter-wave generated using dual parallel electro-optic modulators

In this work, Author investigated the impact of higher order fiber dispersion terms upto third order (3OD) on optical mm-wave generated using two parallel Mach Zehnder Modulators (MZMs). Individual and combined effect of the second order- (2OD) and third order-(3OD) is studied theoretically and experimentally. Expression of fiber dispersion for proposed model is derived using the method of expansion of Bessel function & Taylor series theory. Effect of RF-driven voltage applied to MZM is discussed and analyzed for Optical Sideband Suppression Ratio (OSSR) and Radio Frequency Spurious Suppression Ratio (RFSSR). The Q-factor, Bit Error Rate (BER) and Eye pattern are investigated for ITU's G.655 fiber. Experimental and simulation analysis verified the theoretical analysis.     

Deterministic aperiodic nanostructures for photonics and plasmonics applications

This review focuses on the optical properties and device applications of deterministic aperiodic media generated by mathematical rules with spectral features that interpolate in a tunable fashion between periodic crystals and disordered random media. These structures are called Deterministic Aperiodic Nano Structures (DANS) and can be implemented in different materials (linear and nonlinear) and physical systems as diverse as dielectric multilayers, optical gratings, photonic waveguides and nanoparticle arrays. Among their distinctive optical properties are the formation of multi‐fractal bandgaps and characteristic optical resonances, called critical modes, with unusual localization, scaling and transport properties. The goal of the paper is to provide a detailed review of the conceptual foundation and the physical mechanisms governing the complex optical response of DANS in relation to the engineering of novel devices and functionalities. The discussion will mostly focus on passive and active planar structures with enhanced light‐matter coupling for photonics and plasmonics technologies.     

集成电路技术对通信发展的影响

首先说明晶体管和激光管的发明、微电子集成电路、光电子集成和光子集成不断快速进展的情况。于是，叙述几项重要的信息设备技术：（1）处理器、存贮器、计算机；（2）磁盘、光盘、大容量存储；（3）程控交换系统；（4）光纤固定通信网和无线移动通信网。这些重要应用的发展受到集成电路技术的深刻影响，因而能够以惊人速度持续向前跃进。     

光子学及其讨论

本文简述了光子学提出后,国内外的反响。并就处理高速摄影与光子学的关系问题,提出了“高速光子学”,把它作为光子学的一个分支。这个分支的主要研究对象是高速过程或超快现象,并以时间—空间分辨方式提供信息。末了,探讨了光子学本身的发展前景:随着光计算机研究工作的进展和实现,将确立光子学的牢固地位。     

氧离子注入隔离的全内反射型光波导开关

研制了一种全内反射型InGaAsP/InP光波导开关。采用氧离子注入形成的高阻特性来作为载流予注入区的隔离。由此获得陡峭的反射面,改善了光开关的性能。在入射光波长为1.3um,注入电流为32mAT得到光开关反射端消光比为18dB,无注入时的关态串话为-19dB.     

Synthesis and optical characterization of Ag nanoparticles

The results of chemical synthesis and optical behavior of silver nanoparticles with sizes ranging from 2-10 nm which were obtained by reduction of Ag⁺ are reported. The material morphology was examined by transmission electron microscopy (TEM) and physical properties were studied by photoluminescence in the range of 400-550 nm using two different excitation wavelengths (320 and 380 nm). The signature provided by the silver plasmon is readily noticed in the silver nanoparticles. The nonlinear optical properties were obtained using a Z-scan setup and agree with previous results obtained by other methods and preparation of samples. In particular, a positive nonlinear refractive index of 5.0115×10⁻¹⁰ m²/W was obtained for a broad sample of silver nanoparticles between 2 and 10 nm. The agreement between the properties of the thin film sample and the nanoparticles give emphasis to the Z-scan technique for nonlinearity measurements of much more complex metal-dielectric structures.     

光子学在休闲娱乐中的应用

评述光子学在摄影、显示、音像、影视、体育、音乐和艺术中的应用。     

光纤光栅,全光纤光子线路及其集成

光子学是研究以光子为载体及其应用的一门新兴科学，是当今是未来信息科学的重要支柱，文章对光纤光栅，全光纤光子线路及其集成的研究进展与重要意义进行了评述，并指出：该项研究成果将可能导致现代光通信以及光子学技术产生革命性的突破。因此，应该抓住机遇，把握方向，组织攻关。文章还对重点研究课题提出了建议。