【摘要】：利用太赫茲時(shí)域光譜系統(tǒng),在0.5~9.5 THz范圍內(nèi)對(duì)氧化鎂單晶基片的介電特性進(jìn)行了研究,并獲得折射率、吸收系數(shù)以及復(fù)介電函數(shù)信息。實(shí)驗(yàn)數(shù)據(jù)表明,在低頻(2 THz)范圍內(nèi),氧化鎂單晶透過性較好,折射率在3.12~3.15之間。折射率和吸收系數(shù)均隨頻率增加而增大,且在3.16 THz和8.11 THz兩處存在明顯的吸收峰。通過經(jīng)典的贗簡(jiǎn)諧振動(dòng)理論很好地?cái)M合了實(shí)驗(yàn)結(jié)果,分析了晶體中的橫向光學(xué)聲子振動(dòng)模式,為氧化鎂單晶在寬帶太赫茲波段的應(yīng)用提供了有益參考。
[Abstract]:The dielectric properties of magnesium oxide single crystal substrate were studied in the range of 0.5 ~ 9.5 THz by terahertz time-domain spectroscopy system, and the information of refractive index, absorption coefficient and complex dielectric function were obtained. The experimental data show that in the range of low frequency (2 THz), the transmission of magnesium oxide single crystal is better, and the refractive index is between 3.12 and 3.15. The refractive index and absorption coefficient increase with the increase of frequency, and there are obvious absorption peaks at 3.16 THz and 8.11 THz. The experimental results are well fitted by the classical pseudo-harmonic vibration theory, and the transverse optical phonon vibration modes in the crystal are analyzed, which provides a useful reference for the application of magnesium oxide single crystal in the wideband terahertz band.
【作者單位】： 天津大學(xué)精密儀器與光電子工程學(xué)院光電信息技術(shù)科學(xué)教育部重點(diǎn)實(shí)驗(yàn)室太赫茲波研究中心;中國(guó)科學(xué)院上海應(yīng)用物理研究所;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(2014CB339800) 國(guó)家自然科學(xué)基金(61427814,61138001,61422509)
【分類號(hào)】：TQ132.2

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