共查询到20条相似文献,搜索用时 15 毫秒
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Y. V. Zorenko 《Journal of Applied Spectroscopy》1998,65(2):218-223
The processes of crystallization by the method of liquid epitaxy are studied for the first time for single-crystal films of
CdWO4 doped with the mercurylike ions Bi3+ and Pb2+, which can be used as thin-film components of combined scintillators for monitoring α- and β-activities. It is shown that
in comparison with their solidcrystal analogs, the special features of these films consist in a longwave shift of the integral
luminescence spectrum that is caused by high concentrations of the radiating complexes (VCd-WO6) with hvmax=2.05–2.15 eV and the “distorted” complexes (WO6)* in them. It is found that in the case of luminescence of single-crystal films CdWO4:Pb, radiation of mercurylike centers (PbO6) prevails with hvmax=2.87 eV, while in luminescence of CdWO4, radiation of centers (BiO6) with hvmax=2.16 eV and of complexes (VCd-WO6).
Institute of Applied Physics, Iv. Franko Lvov State University, 49, General Chuprynka St., Lvov, 290044, Ukraine. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 2, pp. 211–215, March–April, 1998. 相似文献
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采用脉冲激光沉积技术在Si(100)和熔石英基片上制备了单相的CuO薄膜.通过X射线衍射仪,拉曼光谱仪,场发射扫描电镜和紫外可见光光度计对薄膜的结构,表面形貌和光学性质进行了表征. 场发射扫描电镜结果表明CuO薄膜中晶粒排列致密且分布均匀,其尺寸约为45nm.结合飞秒激光(800nm,50fs)和Z扫描方法测量了薄膜的三阶非线性光学特性,结果表明CuO薄膜具有超快的非线性光学响应且非线性折射率和非线性吸收系数均为负值,其大小分别为-3.96×10-17 m2<
关键词:
CuO薄膜
Z-扫描')" href="#">Z-扫描
三阶光学非线性 相似文献
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主要从实验和理论两个方面,探讨了强受限尺寸区域内不同尺寸对CdSe量子点线性和非线性光学性质的影响.用吸收光谱研究了量子点尺寸与吸收峰之间的关系,用皮秒Z扫描技术研究了共振和非共振情况下(激发光波长分别为532和1064nm),尺寸与三阶非线性极化率之间的关系.基于电子能量状态理论和局域场增强理论对量子点进行分析,得到了CdSe不同尺寸的三阶非线性效应,研究了尺寸对量子点非线性光学性质的影响.结果表明,由激发态粒子数布局改变和纳米颗粒增大引起的非线性共振增强效应相当,二者共同作用使得三阶极化率增强20倍左右,且用532nm的共振频率激发4.3nm CdSe量子点时,χ(3)具有最大值2.0×10-11esu.
关键词:
CdSe量子点
三阶非线性
Z扫描')" href="#">Z扫描
量子限域效应 相似文献
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Hrant Yeritsyan Vachagan Harutiunian Volodia Gevorkyan Norair Grigoryan Eleonora Hakhverdyan Sergey Nikoghosyan Aram Sahakyan Rudolf Gevorgyan Hakob Sargisyan Yeghis Keheyan 《Central European Journal of Physics》2005,3(4):623-635
Infrared (IR) absorption and luminescence in chemically and radiation-modified natural Armenian Zeolite (clinoptilolite) samples
have been studied. The luminescence was studied in 390–450 nm and 620–710 nm wavelength bands, and the IR measurements were
carried out in the 400–5400 cm−1 range. It is shown that the luminescence intensity depends on the content of pure clinoptilolite in the samples and, probably
on the distribution of “passive” luminescence centers over Si and Al sites that became “active” under radiation or chemical
treatment. The samples of electron irradiated clinoptilolite have higher luminescence intensity than the chemically and thermally
treated ones. A decrease in the intensity of IR absorption bands at 3550 cm−1 and 3650 cm−1 was found after irradiation. 相似文献
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V. M. Belous 《Journal of Applied Spectroscopy》1995,62(3):435-440
I. I. Mechnikov Odessa State University, 27, Pasteur Str., Odessa, 270100, Ukraine. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 62, No. 3, pp. 42–48, May–June, 1995. 相似文献
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B. I. Stepanov Institute of Physics, Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 2, pp. 200–205, March–April, 1995. 相似文献
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T. Shevchenko Kiev State University, 6, Acad. Glushkov Ave., Kiev, 252127, Ukraine. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 62, No. 3, pp. 239–248, May–June, 1995. 相似文献
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石墨烯是单原子厚的二维狄拉克相对论费米子系统,其优秀的光电学性质得到了广泛的关注和研究. 本论文利用量子理论研究掺杂石墨烯系统外电场和光场共同作用下的非平衡载流子的非线性太赫兹光学性质. 研究发现,掺杂石墨烯带内光吸收表现出强的非线性太赫兹光学特性. 随着外加偏压电场的增大,石墨烯非线性光学响应增强;随着外界太赫兹光频率的减小,非线特性增强. 研究表明通过改变电场强度,可以有效调节石墨烯系统太赫兹非线性光学特性. 研究结果为探索和发展以石墨烯为基础的新型纳米太赫兹光电器件的研究和实际应用提供了理论依据.
关键词:
石墨烯
太赫兹
非线性
光电流 相似文献