Статья

Optical nonlinearities of a high concentration of small metal particles dispersed in glass: copper and silver particles

K. UchidaMaterials Research Laboratory, Hoya Corporation, Tokyo 196, JapanShinji KanekoMaterials Research Laboratory, Hoya Corporation, Tokyo 196, JapanS. OmiMaterials Research Laboratory, Hoya Corporation, Tokyo 196, JapanC. HataMaterials Research Laboratory, Hoya Corporation, Tokyo 196, JapanHiroaki TanjiMaterials Research Laboratory, Hoya Corporation, Tokyo 196, JapanYoshiyuki AsaharaMaterials Research Laboratory, Hoya Corporation, Tokyo 196, JapanAkira J. IkushimaMaterials Research Laboratory, Hoya Corporation, Tokyo 196, JapanT. TokizakiDepartment of Applied Physics, Faculty of Engineering, Nagoya University, Nagoya 464-01, JapanArao NakamuraDepartment of Applied Physics, Faculty of Engineering, Nagoya University, Nagoya 464-01, Japan

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ABI

Аннотация

Third-order nonlinearities of glasses doped with a large number of copper or silver particles are studied by degenerate four-wave mixing with an emphasis on particle-size dependence. The nonlinear susceptibility χ(3) exhibits a peak at the wavelength of the absorption peak, with a maximum value of the order of 10−7 esu. The value of χ(3)/α is roughly independent of the absorption coefficient α and increases as the particle radius increases. This result is well explained by the size dependence of the imaginary part of the dielectric constant of metal particles and the local-field factor. The time response of the nonlinearity exhibits two-component behavior: the fast decay time is shorter than the pulse width of the laser (~12 ps), whereas the slow one is 120–200 ps, being weakly dependent on the radius.

Идентификаторы

DOI: 10.1364/josab.11.001236

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