Ultrafast nonlinear optical properties of alkyl-phthalocyanine nanoparticles investigated using Z-scan technique

被引:60
作者
Rao, S. Venugopal [1 ]
Venkatram, N. [2 ]
Giribabu, L. [3 ]
Rao, D. Narayana [2 ]
机构
[1] Univ Hyderabad, ACRHEM, Hyderabad 500046, Andhra Pradesh, India
[2] Univ Hyderabad, Sch Phys, Hyderabad 500046, Andhra Pradesh, India
[3] Indian Inst Chem Technol, Nanomat Lab, Inorgan & Phys Chem Div, Hyderabad 500007, Andhra Pradesh, India
关键词
high-speed optical techniques; nanoparticles; nonlinear optics; optical switches; organic compounds; refractive index; suspensions; REVERSE SATURABLE ABSORPTION; EXCITED-STATE DYNAMICS; LIMITING PROPERTIES; ALKOXY PHTHALOCYANINES; PORPHYRINS; COMPLEXES; NM; NAPHTHALOCYANINES; FEMTOSECOND; FULLERENES;
D O I
10.1063/1.3079801
中图分类号
O59 [应用物理学];
学科分类号
摘要
We report our results on the femtosecond nonlinear optical studies of alkyl-phthalocyanine nanoparticles dispersed in water and dissolved in chloroform. Nonlinear refractive and absorptive properties were investigated using the closed and open aperture Z-scan techniques. The nonlinear optical coefficients obtained for nanoparticles suspended in water are compared with those dissolved in chloroform, which resulted in simple phthalocyanine solutions. Our studies clearly demonstrate the nonlinear refractive index of nanoparticles to be positive, while that of the nanoparticles in chloroform was negative. Our results and analysis point out a high nonlinearity in the ultrafast domain for both the nanoparticles and solutions indicating their potential in optical signal processing and limiting applications.
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页数:6
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