氧化镁单晶在太赫兹波段的介电特性
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摘要
利用太赫兹时域光谱系统,在0.5~9.5 THz范围内对氧化镁单晶基片的介电特性进行了研究,并获得折射率、吸收系数以及复介电函数信息。实验数据表明,在低频(<2 THz)范围内,氧化镁单晶透过性较好,折射率在3.12~3.15之间。折射率和吸收系数均随频率增加而增大,且在3.16 THz和8.11 THz两处存在明显的吸收峰。通过经典的赝简谐振动理论很好地拟合了实验结果,分析了晶体中的横向光学声子振动模式,为氧化镁单晶在宽带太赫兹波段的应用提供了有益参考。
The dielectric properties of single-crystal MgO were studied by terahertz time-domain spectroscopy in the frequency range extending from 0.5 to 9.5 THz. The refractive index, power absorption, and the complex dielectric function were extracted from experimental data. At low terahertz frequencies band(<2 THz), the absorption coefficient was extremely low and increased with increasing frequency. Meanwhile the corresponding refractive index had low dispersion, increasing from 3.12 to3.15. Two prominent resonances were observed at 3.16 THz and 8.11 THz and were well-described by a multiple-oscillator model through theoretical fitting. The interaction of incident photons and the transverse optical(TO) phonons in the crystal were studied and it gives good evidence to further applications in developing broadband terahertz components and terahertz spectroscopy.
The dielectric properties of single-crystal MgO were studied by terahertz time-domain spectroscopy in the frequency range extending from 0.5 to 9.5 THz. The refractive index, power absorption, and the complex dielectric function were extracted from experimental data. At low terahertz frequencies band(<2 THz), the absorption coefficient was extremely low and increased with increasing frequency. Meanwhile the corresponding refractive index had low dispersion, increasing from 3.12 to3.15. Two prominent resonances were observed at 3.16 THz and 8.11 THz and were well-described by a multiple-oscillator model through theoretical fitting. The interaction of incident photons and the transverse optical(TO) phonons in the crystal were studied and it gives good evidence to further applications in developing broadband terahertz components and terahertz spectroscopy.
引文
[1]Li R,Wang J J,Zhou B,et al.Recovery of phosphate from aqueous solution by magnesium oxide decorated magnetic biochar and its potential as phosphate-based fertilizer substitute[J].Bioresource Technology,2016,215:209-214.
[2]Rezaei F,Moussavi G,Bakhtiari A R,et al.Toluene removal from waste air stream by the catalytic ozonation process with Mg O/GAC composite as catalyst[J].Journal of Hazardous Materials,2016,306:348-358.
[3]Soltani R D C,Safari M.Periodate-assisted pulsed sonocatalysis of real textile wastewater in the presence of Mg O nanoparticles:Response surface methodological optimization[J].Ultrasonics Sonochemistry,2016,32:181-190.
[4]Gerbaux X,Hadni A,Tazawa M,et al.Far-infrared spectra of magnesium oxide[J].Applied Optics,1994,33(1):57-59.
[5]Sajadi M,Wolf M,Kampfrath T.Terahertz-field-induced optical birefringence in common window and substrate materials[J].Optics Express,2015,23(22):28985-28992.
[6]Irimajiri Y,Kawakami A,Morohashi I,et al.Development of a superconducting low-noise 3.1-THz hot electron bolometer receiver[J].IEEE Transactions on Terahertz Science and Technology,2015,5(6):1154-1159.
[7]Han J,Woo B K,Chen W,et al.Terahertz dielectric properties of Mg O nanocrystals[J].Journal of Physical Chemistry C,2008,112(45):17512-17516.
[8]Cunsolo S,Dore P,Varsamis C P.Refractive index of crystals from transmission and reflection measurements:Mg O in the far-infrared region[J].Applied Optics,1992,31(22):4554-4558.
[9]Yang T R,Perkowitz S,Carr G L,et al.Infrared properties of single crystal Mg O,a substrate for high temperature superconducting films[J].Applied Optics,1990,29(3):332-333.
[10]Yang Jing,Zhao Jiayu,Guo Lanjun,et al.Study of terahertz radiation from filamentation induced by ultrafast laser pulses[J].Infrared and Laser Engineering,2015,44(3):996-1007.(in Chinese)
[11]Karpowicz N,Dai J,Lu X,et al.Coherent heterodyne time-domain spectrometry covering the entire"terahertz gap"[J].Applied Physics Letters,2008,92(1):011131.
[12]Balkanski M.Optical Properties of Solids[M].New York:North-Holland,1972:533.
[13]Madelung O.Physics of II-VI and I-VII Compounds,Semimagnetic Semiconductors[M].Berlin:Springer-Verlag,1982:13.
[14]Shpakov V,Gotte A,Baudin M,et al.Mg O(001)surface phonons from ab initio calculations[J].Physical Review B,2005,72(19):195427.
[2]Rezaei F,Moussavi G,Bakhtiari A R,et al.Toluene removal from waste air stream by the catalytic ozonation process with Mg O/GAC composite as catalyst[J].Journal of Hazardous Materials,2016,306:348-358.
[3]Soltani R D C,Safari M.Periodate-assisted pulsed sonocatalysis of real textile wastewater in the presence of Mg O nanoparticles:Response surface methodological optimization[J].Ultrasonics Sonochemistry,2016,32:181-190.
[4]Gerbaux X,Hadni A,Tazawa M,et al.Far-infrared spectra of magnesium oxide[J].Applied Optics,1994,33(1):57-59.
[5]Sajadi M,Wolf M,Kampfrath T.Terahertz-field-induced optical birefringence in common window and substrate materials[J].Optics Express,2015,23(22):28985-28992.
[6]Irimajiri Y,Kawakami A,Morohashi I,et al.Development of a superconducting low-noise 3.1-THz hot electron bolometer receiver[J].IEEE Transactions on Terahertz Science and Technology,2015,5(6):1154-1159.
[7]Han J,Woo B K,Chen W,et al.Terahertz dielectric properties of Mg O nanocrystals[J].Journal of Physical Chemistry C,2008,112(45):17512-17516.
[8]Cunsolo S,Dore P,Varsamis C P.Refractive index of crystals from transmission and reflection measurements:Mg O in the far-infrared region[J].Applied Optics,1992,31(22):4554-4558.
[9]Yang T R,Perkowitz S,Carr G L,et al.Infrared properties of single crystal Mg O,a substrate for high temperature superconducting films[J].Applied Optics,1990,29(3):332-333.
[10]Yang Jing,Zhao Jiayu,Guo Lanjun,et al.Study of terahertz radiation from filamentation induced by ultrafast laser pulses[J].Infrared and Laser Engineering,2015,44(3):996-1007.(in Chinese)
[11]Karpowicz N,Dai J,Lu X,et al.Coherent heterodyne time-domain spectrometry covering the entire"terahertz gap"[J].Applied Physics Letters,2008,92(1):011131.
[12]Balkanski M.Optical Properties of Solids[M].New York:North-Holland,1972:533.
[13]Madelung O.Physics of II-VI and I-VII Compounds,Semimagnetic Semiconductors[M].Berlin:Springer-Verlag,1982:13.
[14]Shpakov V,Gotte A,Baudin M,et al.Mg O(001)surface phonons from ab initio calculations[J].Physical Review B,2005,72(19):195427.
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