退火Mn_(1.95)Co_(0.77)Ni_(0.28)O_(4)薄膜在近红外和中红外波段的光学机理  

Optical Mechanism of Annealed Mn_(1.95)Co_(0.77)Ni_(0.28)O_(4) Thin Films in Near and Mid Infrared Waveband

作　　者：张飞 居靖淇 ZHANG Fei;JU Jing-qi(College of Ocean Science and Engineering, Shanghai MaritimeUniversity, Shanghai 201306, China)

机构地区：[1]上海海事大学海洋科学与工程学院,上海201306

出　　处：《红外》2022年第3期1-7,共7页Infrared

基　　金：国家自然科学基金项目(61805042);上海市科学技术委员会项目(20ZR1423400);上海深海材料工程技术研究中心项目(19DZ2253100)。

摘　　要：采用双洛伦兹模型和有效介质近似(Efficient Medium Approximation,EMA)色散模型对退火的Mn_(1.95)Co_(0.77)Ni_(0.28)O_(4)薄膜在近红外和中红外波段的椭偏数据进行了拟合。通过比较直流电压下测试的电导率与低频下计算的电导率(ω→0)发现,A谐振子主要产生传导电流,B谐振子主要产生位移电流。对于Mn_(1.95)Co_(0.77)Ni_(0.28)O_(4)薄膜,随着退火温度的升高,晶格共振吸收逐渐被电子共振吸收所取代。退火样品的折射率n和消光系数k均由退火过程决定。The ellipsometric data in near and mid infrared waveband are fitted by double Lorentz and effective medium approximation(EMA)dispersion models for annealed Mn_(1.95)Co_(0.77)Ni_(0.28)O_(4)thin films.By comparing the tested conductivity under direct current(DC)voltage with the calculated conductivity at low frequency(ω→0),it is found that A oscillator mainly generates conduction current and B oscillator mainly generates displacement current.For Mn_(1.95)Co_(0.77)Ni_(0.28)O_(4)thin films,the lattice resonance absorption will gradually be replaced by the electron resonance absorption with increasing annealing temperature.Both the refractive index n and extinction coefficient k of the annealed samples are determined by the annealing process.

关 键 词：Mn_(1.95)Co_(0.77)Ni_(0.28)O_(4)薄膜 椭偏光谱 色散 谐振子 小极化子 

分 类 号：O439[机械工程—光学工程]