氧化鎂單晶在太赫茲波段的介電特性
發(fā)布時間:2018-07-14 22:05
【摘要】:利用太赫茲時域光譜系統(tǒng),在0.5~9.5 THz范圍內(nèi)對氧化鎂單晶基片的介電特性進行了研究,并獲得折射率、吸收系數(shù)以及復介電函數(shù)信息。實驗數(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)典的贗簡諧振動理論很好地擬合了實驗結(jié)果,分析了晶體中的橫向光學聲子振動模式,為氧化鎂單晶在寬帶太赫茲波段的應用提供了有益參考。
[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】: 天津大學精密儀器與光電子工程學院光電信息技術(shù)科學教育部重點實驗室太赫茲波研究中心;中國科學院上海應用物理研究所;
【基金】:國家重點基礎(chǔ)研究發(fā)展計劃(2014CB339800) 國家自然科學基金(61427814,61138001,61422509)
【分類號】:TQ132.2
本文編號:2123102
[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】: 天津大學精密儀器與光電子工程學院光電信息技術(shù)科學教育部重點實驗室太赫茲波研究中心;中國科學院上海應用物理研究所;
【基金】:國家重點基礎(chǔ)研究發(fā)展計劃(2014CB339800) 國家自然科學基金(61427814,61138001,61422509)
【分類號】:TQ132.2
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