基于光子晶体的太赫兹波4-2编码器  

Terahertz Wave 4-2 Encoder Based on Photonic Crystal

作　　者：姜宗丹 李培丽 徐光跃 Jiang Zongdan;Li Peili;Xu Guangyue(College of Electronic and Optical Engineering&College of Microelec Monies,Nanjing University of Posts&Telecommunications,Jiangsu,Nanjing 210023,China)

机构地区：[1]南京邮电大学电子与光学工程学院、微电子学院,江苏南京210023

出　　处：《中国激光》2021年第20期180-187,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(61275067);江苏省研究生科研与实践创新计划(KYCX19_0965)。

摘　　要：在完整的二维正方晶格硅光子晶体中引入线缺陷波导,采用四个输入端口和三个输出端口,提出了一种基于光子晶体的太赫兹波4-2编码器。利用平面波展开法和时域有限差分法分析研究了该编码器的性能。仿真结果表明,该方案可以在251~252μm波长范围内实现对比度不低于13.27 dB(最高达到18.02 dB),响应时间为ps量级的太赫兹波4-2编码器。该编码器具有尺寸小、结构简单、对比度高、响应速度快等优点,在未来太赫兹波通信中具有广阔的应用前景。Objective With the rapid development of communication and computer technology,people′s requirements for information transmission and processing are also increasing.The rapid development of wireless communication leads to the lack of spectrum resources and the development of new frequency bands has become a consensus to solve the lack of spectrum resources.Several frequency bands of the terahertz(THz)band which have not been developed and used have attracted people’s attention recently.High-performance equipment and easily integrated products are required in THz wave communication systems.Due to the unique properties of photonic crystals,such as photonic bandgap and photonic localization,they are often used to design and manufacture THz wave devices.Currently,most research on the 4-2encoder based on the photonic crystal focuses on the optical band,while the research on the 4-2encoder in the THz band is less.Therefore,it is crucial to study the THz 4-2encoder with high contrast and fast response to meet the increasing demands in information transmission and processing using the THz wave communication system.The development of THz 4-2encoders has correspondingly promoted the improvement and progress of THz communication systems,which is also an indispensable and crucial part of the THz communication system.Methods Based on the bandgap and local properties of photonic crystals,a novel THz 4-2encoder is proposed using the photonic crystal.This proposed scheme introduces the line defect waveguide into a complete two-dimensional square lattice silicon photonic crystal.The line defects consisting of four input ports(I_(0),I_(1),I_(2),and I_(3))and three output ports(V,O_(1),and O_(0))are used to achieve the logic function of the THz wave 4-2encoder.When THz wave is input from input port I_(0),all THz waves are output from output port V,and the logic state of O_(1) and O_(0)is"00";when THz wave is input from input port I_(1),most THz waves are output from output port O_(0)because of the bending waveguide,the logic sta

关 键 词：太赫兹技术 编码器 光子晶体 逻辑门 

分 类 号：TN256[电子电信—物理电子学]