非共振区金纳米颗粒阵列的三阶非线性光学性质的研究
首发时间:2009-12-29
摘要:采用纳米球蚀刻技术在石英衬底上制备了不同高度的金纳米颗粒阵列.通过扫描电子显微镜对其表面形貌进行了观测,表明金纳米颗粒为有序分布的三棱柱结构。观测到了金纳米颗粒表面等离子体振荡效应引起的光吸收峰在606nm处,与近偶极子理论计算结果进行比较。用飞秒激光(50fs,800nm)作为激发光源的Z扫描法测试了样品的三阶非线性光学性质,结果表明Au纳米颗粒阵列具有大的非线性吸收系数和折射率,有效三阶非线性极化率χeff(3)达(8.81.0)×10-10 esu。
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Off-resonant third-order optical nonlinearity of Au nanoparticle array by femtosecond Z-scan measurement
Abstract:In order to study the linear and nonlinear optical properties of metal particles, the periodic triangular-shaped Au nanoparticle array was fabricated on a quartz substrate using nanosphere lithography and pulsed laser deposition. The morphology of the polystyrene nanosphere mask (D=820 nm) and the Au nanoparticle array were investigated by scanning electron microscopy. The surface plasmon resonance absorption peak was observed at 606 nm, which is in good agreement with the calculated result using discrete dipole approximation method. By performing the Z-scan method with femtosecond laser (800 nm, 50 fs), the optical nonlinearities of Au nanoparticle array were determined. The results show that the Au particles exhibit negative nonlinear absorption and positive nonlinear refractive index with the effective third-order optical nonlinear susceptibility, χeff(3), can be up to (8.81.0)×10-10 esu under non-resonant femtosecond laser excitation.
Keywords: Nanosphere Lithography Au Nanoparticles Third-order Nonlinearity
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No.3820550951312620****
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