Chin. Phys. B ›› 2013, Vol. 22 ›› Issue (1): 14212-014212.doi: 10.1088/1674-1056/22/1/014212
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
余本海, 张东玲, 李盈傧, 汤清彬
Yu Ben-Hai (余本海), Zhang Dong-Ling (张东玲), Li Ying-Bin (李盈傧), Tang Qing-Bin (汤清彬)
摘要: The optical nonlinearities of an Ag nanoparticle array are investigated by performing the Z-scan measurements at the selected wavelengths (400, 600, 650, and 800 nm). The nonlinear refraction index in the resonant region (around 400 nm) exhibits a significant enhancement by two orders compared with that in the off-resonant region (around 800 nm)), and exhibits an sign alternation of the resonant nonlinear absorption, which results in a negligible nonlinear absorption at a certain excitation intensity. Moreover, a low degree of nonlinear absorption was measured at the edges of the resonant region (600 and 650 nm), which is attributed to the competition of the saturated absorption and the two-photon absorption processes.
中图分类号: (Other nonlinear optical materials; photorefractive and semiconductor materials)