Giant optical nonlinearity of silver-doped silicon thin film at low power input: laser-triggered cluster resonance |
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Authors: | Jingsong Wei Jing Liu Mufei Xiao |
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Affiliation: | 1. Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China 2. State Key Lab of Silicon Materials, Zhejiang University, Hangzhou, 310027, China 3. Centro de Nanociencias y Nanotecnolog??a, Universidad Nacional Aut??noma de M??xico, Apartado Postal 365, CP 22800, Ensenada, Baja California, Mexico
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Abstract: | Silver-doped silicon thin films were deposited on glass substrate in a co-sputtering procedure. Silver nanoparticles were segregatedly distributed. The nonlinear properties were extracted by z-scan measurements at low laser input power. For about 50% silver density, the nonlinear absorption and refraction coefficients peaked, respectively, at ?8.086×10?2?m/W and 1.47×10?9?m2/W, which, with respect to the input intensity, are several orders higher than reported data. The sudden surge of nonlinear responses was explained satisfactorily based on a self-consistent microscopic model calculation for silver clusters. Resonances exist and depend apparently on the laser-modified local cluster concentration. |
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