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1.
足球烯分子三阶非线性光学性质的研究 总被引:1,自引:0,他引:1
报道了有关足球烯分子甲苯溶液中简并四波混频实验.测量出足球烯C_(70)分子和C_(60)分子的三阶超极化率张量y_(1111)分量分别为1.2×10~(-30)esu和4.0×10~(-31)esu.对应于固体样品的三阶非线性光学系数X_(1111)分量分别是2.5×10~(-8)esu和8.5×10~(-9)esu.此结果表明了足球烯分子是现有的非线性光学材料中具有较大三阶非共振电子极化率材料之一.文中还利用自由电子模型解释了非线性光学极化率的起源. 相似文献
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设计合成了6个新的蒽二酮类化合物,用紫外可见吸收光谱、傅里叶变换红外光谱、1H核磁共振和元素分析表征了结构.采用飞秒激光,运用简并四波混频法,研究了化合物在非共振状态下的三阶非线性光学性能.它们的三阶非线性光学极化率χ(3)为2.62~3.55×10-13esu,非线性折射率n2为4.82~6.52×10-12esu,分子二阶超极化率γ为2.57~3.25×10-31esu,响应时间τ为91~116fs.探索了化合物的分子结构对三阶非线性光学性能的影响.增长共轭链,形成供吸供构型,增大取代基的供电子能力,提高共轭体系的共平面程度等因素有利于获得较大的三阶非线性光学性能. 相似文献
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聚芳香杂环甲烯的三阶非线性光学效应与时间分辨光克尔效应 总被引:6,自引:4,他引:2
合成了一系列聚芳香杂环甲烯,包括聚吡咯甲烯和聚噻吩甲烯.采用四波混频法研究材料的共振三阶非线性光学效应(λ=532nm),其共振二阶超分子极化率γ三阶非线性光学系数分别达到10-30esu和10-8esu.选择具有良好溶解性、成膜性的聚吡咯对二甲氨基苯甲烯(PPDMAB),采用飞秒时间分辨光克尔效应方法研究材料的非共振三阶非线性光学效应(λ=790nm).实验表明,翠绿亚胺碱溶液的光克尔信号仅表现一超快响应的成分,归功于π电子云扭转产生的非共振激发.PPDMAB的非共振二阶超分子极化率γ三阶非线性光学系数分别达到γ=5.78×10-32esu和χ(3)=1.26×10-10esu. 相似文献
4.
设计合成了6个新的蒽二酮类化合物,用紫外可见吸收光谱、傅里叶变换红外光谱、1H 核磁共振和元素分析表征了结构.采用飞秒激光,运用简并四波混频法,研究了化合物在非共振状态下的三阶非线性光学性能.它们的三阶非线性光学极化率χ(3)为2.62~3.55×10-13 esu,非线性折射率n2为4.82~6.52×10-12 esu,分子二阶超极化率γ为2.57~3.25×10-31 esu,响应时间τ为91~116 fs.探索了化合物的分子结构对三阶非线性光学性能的影响.增长共轭链,形成供吸供构型,增大取代基的供电子能力,提高共轭体系的共平面程度等因素有利于获得较大的三阶非线性光学性能. 相似文献
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报道了甲酚紫染料的非线性光学性质的实验研究方法及其结果.利用简并四波混频技术,测量得到甲酚紫甲醇溶液(浓度为5×10~(-4)M)的三阶非线性极化率X~(3)为2.0×10~(-10)esu.此外,利用不同强度皮秒脉冲相关技术得到了甲酚紫甲醇溶液的吸收恢复时间τ_(21)为163ps. 相似文献
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通过双醚化反应、氯甲基化反应以及在强碱性条件下进行的脱氯化氢反应制备聚(2-甲氧基-5-丁氧基)对苯乙炔(PMOBOPV)、聚(2-甲氧基-5-己氧基)对苯乙炔(PMOHOPV)、聚(2,5-二丁氧基)对苯乙炔(PDBOPV)和聚(2,5-二己氧基)对苯乙炔(PDHOPV)等四种可溶性聚对苯乙炔(PPV)衍生物,通过紫外-可见吸收光谱对产物分子结构进行表征.结果显示,PMOBOPV、PMOHOPV、PDBOPV和PDHOPV的共轭π电子发生π → π* 跃迁的吸收峰分别位于491 nm、495nm、504nm和510nm处,相应的光学禁带宽度分别为2.23eV、2.18eV、2.12eV和2.07eV.利用简并四波混频技术测量PPV衍生物的三阶非线性光学性能,探讨了分子结构对PPV衍生物三阶非线性极化率(χ(3))的影响.研究发现,激发波长为532 nm时,PMOBOPV、PMOHOPV、PDBOPV和PDHOPV的共振χ(3)值分别为3.45×10-10、5.13×10-10、7.15×10-10和9.61×10-10 esu;激发波长为1064 nm时,它们的非共振χ(3)值分别为1.09×10-11、1.42×10-11、1.62×10-11和2.14×10-11 esu. 相似文献
7.
Bi2S3纳米复合材料的非线性光学性质 总被引:3,自引:1,他引:2
利用单光束 Z扫描技术 ,在波长为 1 .0 64μm、脉宽为 38ps条件下测定了不同热处理条件下表面包覆纳米 Bi2 S3 掺杂有机改性硅酸盐材料的三阶光学非线性。结果发现室温下自然干燥的样品和在 N2 气氛下 1 50℃加热处理 2小时后的样品的三阶光学非线性极化系数分别为5.8× 1 0 -1 3 esu和 3.7× 1 0 -1 2 esu。后者的三阶光学非线性极化系数比前者几乎大一个数量级。显然 ,适当的热处理能增强样品的三阶光学非线性。对此现象进行了分析和讨论。 相似文献
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三新戊氧基溴硼亚酞菁薄膜材料的三阶非线性光学特性 总被引:3,自引:0,他引:3
通过单光束Z扫描技术 ,在波长为 1.0 6 4μm和 5 32nm、脉宽为 38ps条件下研究了一种新的酞菁相关化合物三新戊氧基溴硼亚酞菁薄膜材料的三阶非线性光学特性。观察到在 1.0 6 4μm(离强吸收带很远 )下的双光子吸收和在 5 32nm下的反饱和吸收现象 ,并计算出了相应的非线性吸收系数。在 1.0 6 4μm下的非共振三阶非线性极化率和在 5 32nm下的共振三阶非线性极化率 χ(3 ) 分别为 6 .1× 10 - 1 2 esu和 6 .7× 10 - 1 0 esu ,显著大于相关酞菁的值。这些结果表明三新戊氧基溴硼亚酞菁薄膜材料在非线性光学方面具有潜在的应用前景。 相似文献
9.
CdxHg1-xTe/SiO2固溶体微晶掺杂玻璃三阶非线性光学性质的 总被引:1,自引:0,他引:1
本文首次报道了对采用溶胶凝胶和原位生长工艺制备的CdxHg1-xTe/SiO2固溶体微品掺杂玻璃进行的三阶非线性光学性质实验研究及其结果。利用回返式简并四波混频技术,测得该固溶体掺杂玻璃的三阶非线性极化率的值为10-12esu量级。此结果比纯SiO2基体提高了2个数量级。表明该固溶体掺杂玻璃三阶非线性明显增强,在同样条件下,测得CS2的三阶非线性极化率x(3)为(1.7±0.2)×10-12esu,与国际上报道完全一致。 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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应用Z扫描技术,在波长为532nm、脉宽为8ns条件下,对一种新型亚酞菁配合物三-α-(2,4-二甲基-3-戊氧基)溴硼亚酞菁的三阶非线性光学特性进行了研究,结果发现,该新化合物有较强的反饱和吸收(β=3.7×10-10 m/W)效应和非线性自聚焦折射效应(n2=7.2×10-11esu),其三阶非线性极化率χ(3)=1.1×10-11esu.分析了溴硼亚酞菁配合物特殊的锥形分子结构和重原子溴的轴向配位等因素对其三阶非线性光学性质的重要影响.
关键词:
亚酞菁
Z扫描
三阶光学非线性 相似文献
13.
LARGE AND EXTREMELY FAST THIRD-ORDER NON-LINEARITY OF Ag NANOPARTICLES EMBEDDED INTO A CsxO SEMICONDUCTOR MATRIX 下载免费PDF全文
Zhang Qi-feng Shao Qing-yi Hou Shi-min Zhang Geng-min Liu Wei-min Xue Zeng-quan Wu Jin-lei Wang Shu-feng Liang Rui-sheng Huang Wen-tao Wang Dan-ling Gong Qi-huang 《中国物理》2001,10(13):65-69
The third-order optical nonlinearity of Ag-O-Cs thin films, where Ag nanoparticles are embedded into a CsxO semiconductor matrix, was measured by the femtosecond optical Kerr technique. The third-order nonlinear optical susceptibility, χ(3), of the thin films was estimated to be 1.1×10-9 esu at the incident wavelength of 820 nm. The response time, i.e. the full width at half-maximum of the Kerr signal, is as fast as 114 fs only. The intrinsic third-order optical nonlinearity can be attributed to the intraband transition of electrons from the occupied state near the Fermi level to the unoccupied state. It is suggested that such a nonlinearity is further enhanced by the local field effect that is present in the metallic nanoparticles composite thin films. 相似文献
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Bada Jayappa Rudresha Badekai Ramachandra Bhat Dileep Ramakrishna John Kiran Anthony H.W. Lee F. Rotermund 《Optics & Laser Technology》2012,44(4):1180-1183
A femtosecond differential optical Kerr gate (DOKG) and Z-scan techniques, have been applied to investigate the third-order optical nonlinearity of composite film of the coordination complex [PdLPPh3] (L=N-(2-pyridyl)-N′-(salicylidene)hydrazine, PPh3=triphenylphosphine). Film exhibits superior nonlinear optical properties in the near-infrared spectral region. The nonlinear response time and third-order nonlinear optical susceptibility of complex were found to be≤90 fs and 3.9×10?10 esu, respectively. The Z-scan result shows that saturable absorption property of the film and its nonlinear absorption coefficient of the sample was found to be ?23 cm/GW. 相似文献
16.
Y. Liu D. Li R.Y. Zhu G.J. You S.X. Qian Y. Yang J.L. Shi 《Applied physics. B, Lasers and optics》2003,76(4):435-439
Au-core CdS-shell composite nanoparticles were synthesized by a direct self-assembly process and integrated into BaTiO3 thin films. Characterization by transmission electron microscopy showed that the average diameter of these composite nanoparticles
was about 8 nm. Using the femtosecond time-resolved optical Kerr effect method, we investigated the third-order nonlinear
optical response of the Au@CdS nanoparticles embedded in the BaTiO3 thin films at a wavelength of 800 nm. An ultrafast nonlinear response and a large effective third-order nonlinear susceptibility
of χ(3)=7.7×10-11 esu were observed. We attributed the enhancement of the third-order optical nonlinearity to a localized electric field effect
originating from the core-shell structure under off-surface-plasmon resonance conditions.
Received: 13 May 2002 / Revised version: 23 October 2002 / Published online: 3 April 2003
RID="*"
ID="*"Corresponding author. Fax: +86-21/6510-4949, E-mail: sxqian@fudan.ac.cn 相似文献
17.
D.J. Wu X.J. Liu L.L. Liu W.P. Qian 《Applied Physics A: Materials Science & Processing》2008,92(2):279-282
The third-order nonlinear optical properties of gold nanoshells in aqueous solution have been investigated by using open-
and closed-aperture Z-scan methods. The real and imaginary third-order nonlinear susceptibilities are obtained to be about
-1.1422×10-13 and -2.4302×10-14 esu, respectively. We further have investigated the electric field enhancement for gold nanoshells in aqueous solution by
means of a finite-element method and ascribed the small third-order nonlinear susceptibility to the smaller volume fraction
and local field factor.
PACS 42.65.Re; 78.67.Bf; 73.22.Lp 相似文献
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Ultrafast third-order optical nonlinearities of the as-deposited and annealed Au:Bi2O3 nanocomposite films deposited by magnetron cosputtering are investigated by using femtosecond time-resolved optical Kerr effect (OKE) and pump probe techniques. The third-order optical nonlinear susceptibility is estimated to be 2.6Ф×10^- 10 esu and 1.8 × 10.9 esu at wavelength of 800nm, for the as-deposited and the annealed film, respectively. The OKE signal of the as-deposited film is nearly temporally symmetrical with a peak centred at zero delay time, which indicates the dominant contribution from intraband transition of conduction electrons. For the annealed film, the existence of a decay process in OKE signal implies the important contribution of hot electrons. These characteristics are in agreement with the hot electron dynamics observed in pump probe measurement. 相似文献