{"title":"Numerical Demonstration of THz Traveling Wave Amplifications in 2-D Electron Gas (2DEG) Under Scattering-Free and Low-Charge Density Regime","authors":"Shubhendu Bhardwaj;Md Faiyaz Bin Hassan","doi":"10.1109/LMWT.2024.3383769","DOIUrl":null,"url":null,"abstract":"In this letter, we investigate the terahertz field fluctuations and dynamic interactions with electrons in a 2-D electron gas (2DEG) under the influence of slow wave structure in a substrate-based device. Low-charge density and the scattering-free regime are considered to maintain practical simulation times. The dynamics of this interaction are simulated using a co-planar waveguide (CPW)-connected interdigitated metal grating structure to provide electromagnetic (EM) excitation and phase velocity comparable to electron drift in the 2DEG channel. This letter demonstrates that interdigitated slow wave structure provides a media for synchronous interaction between electron gas and EM waves leading to amplification of charge density and velocity oscillations in a 2DEG. The method used for this numerical work is a full-wave-global numerical model that uses finite-difference time domain (FDTD)-based particle in cell solver of electron transport in 2DEG, with self-consistent EM field solution. Under the considered regime and device, the current oscillations show an increase in amplitude which illustrates the effect of synchronous interaction between the 2DEG.","PeriodicalId":73297,"journal":{"name":"IEEE microwave and wireless technology letters","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE microwave and wireless technology letters","FirstCategoryId":"1085","ListUrlMain":"https://ieeexplore.ieee.org/document/10500699/","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"0","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
In this letter, we investigate the terahertz field fluctuations and dynamic interactions with electrons in a 2-D electron gas (2DEG) under the influence of slow wave structure in a substrate-based device. Low-charge density and the scattering-free regime are considered to maintain practical simulation times. The dynamics of this interaction are simulated using a co-planar waveguide (CPW)-connected interdigitated metal grating structure to provide electromagnetic (EM) excitation and phase velocity comparable to electron drift in the 2DEG channel. This letter demonstrates that interdigitated slow wave structure provides a media for synchronous interaction between electron gas and EM waves leading to amplification of charge density and velocity oscillations in a 2DEG. The method used for this numerical work is a full-wave-global numerical model that uses finite-difference time domain (FDTD)-based particle in cell solver of electron transport in 2DEG, with self-consistent EM field solution. Under the considered regime and device, the current oscillations show an increase in amplitude which illustrates the effect of synchronous interaction between the 2DEG.