本文選題：太赫茲 + 遠(yuǎn)紅外��； 參考：《物理學(xué)報》2017年12期

【摘要】：提出了一種基于測量反射率譜、使用Kramers-Kronig(KK)關(guān)系建立金屬太赫茲色散模型的方法.結(jié)合合金鋁和合金銅4—40 THz的測量反射率譜,通過反射系數(shù)振幅和相位的KK關(guān)系,采用高頻端指數(shù)外推,低頻端常數(shù)外推的方法,反演金屬復(fù)折射率.以KK反演的復(fù)折射率作為實驗值,以擬合復(fù)折射率和實驗值誤差最小為準(zhǔn)則,使用遺傳優(yōu)化算法,擬合了合金鋁和合金銅的Drude色散參數(shù)(等離子頻率和碰撞頻率).基于優(yōu)化的Drude模型計算了0.1—40 THz材料的復(fù)折射率,與橢偏儀的實測結(jié)果符合,驗證了模型的準(zhǔn)確性.該方法理論與實驗相互驗證,以測量的復(fù)折射率作為實驗定標(biāo),將遠(yuǎn)紅外頻段的色散信息拓展到太赫茲頻域,確定了太赫茲頻段金屬的微觀物理參數(shù),提供了太赫茲頻段色散和散射機(jī)理的研究依據(jù).
[Abstract]:Based on the reflectance spectrum measurement, a method is proposed to establish the terahertz dispersion model of metals by using Kramers-Kronig (KK) relation. Combined with the reflectance spectra of aluminum alloy and copper alloy at 4-40 THz, the complex refractive index of metals was inversed by the method of index extrapolation at high frequency and extrapolation of constant at low frequency by KK relation of reflection coefficient amplitude and phase. Taking the complex refractive index of KK inversion as the experimental value and the minimum error of fitting complex refractive index and experimental value as the criterion, the Drude dispersion parameters (plasma frequency and collision frequency) of aluminum alloy and copper alloy are fitted by genetic optimization algorithm. Based on the optimized Drude model, the complex refractive index of 0.1-40 THz material is calculated, which is in agreement with the measured results of ellipsometer, and the accuracy of the model is verified. The theory of this method is verified by experiments, and the complex refractive index is used as the experimental calibration. The dispersion information in far infrared band is extended to terahertz frequency domain, and the microphysical parameters of metal in terahertz band are determined. The study of dispersion and scattering mechanism in terahertz band is provided.
【作者單位】： 西安電子科技大學(xué)物理與光電工程學(xué)院信息感知技術(shù)協(xié)同創(chuàng)新中心;中國科學(xué)院上海技術(shù)物理研究所紅外物理國家重點(diǎn)實驗室;西安工業(yè)大學(xué)光電工程學(xué)院;
【基金】：國家自然科學(xué)基金(批準(zhǔn)號:61571355)資助的課題~~
【分類號】：O441;TG113.22

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本文編號：2115060