LARGE AND EXTREMELY FAST THIRD-ORDER NON-LINEARITY OF Ag NANOPARTICLES EMBEDDED INTO A CsxO SEMICONDUCTOR MATRIX

中国物理B ›› 2001, Vol. 10 ›› Issue (13): 65-69.

LARGE AND EXTREMELY FAST THIRD-ORDER NON-LINEARITY OF Ag NANOPARTICLES EMBEDDED INTO A Cs_xO SEMICONDUCTOR MATRIX

张琦锋¹, 邵庆益¹, 侯士敏¹, 张耿民¹, 刘惟敏¹, 薛增泉¹, 吴锦雷¹, 王树峰², 梁瑞生², 黄文涛², 王丹翎², 龚旗煌²

(1)Department of Electronics, Peking University, Beijing 100871, China; (2)Department of Physics, Peking University, Beijing 100871, China

收稿日期:2001-03-14 出版日期:2001-12-25 发布日期:2005-07-07
基金资助:
Project supported partly by the National Natural Science Foundation of China (Grant No. 60071017) and the Natural Science Foundation of Beijing, China (Grant No. 2992019).

LARGE AND EXTREMELY FAST THIRD-ORDER NON-LINEARITY OF Ag NANOPARTICLES EMBEDDED INTO A Cs_xO SEMICONDUCTOR MATRIX

Zhang Qi-feng (张琦锋)^a, Shao Qing-yi (邵庆益)^a, Hou Shi-min (侯士敏)^a, Zhang Geng-min (张耿民)^a, Liu Wei-min (刘惟敏)^a, Xue Zeng-quan (薛增泉)^a, Wu Jin-lei (吴锦雷)^a, Wang Shu-feng (王树峰)^b, Liang Rui-sheng (梁瑞生)^b, Huang Wen-tao (黄文涛)^b, Wang Dan-ling (王丹翎)^b, Gong Qi-huang (龚旗煌)^b

^a Department of Electronics, Peking University, Beijing 100871, China; ^b Department of Physics, Peking University, Beijing 100871, China

Received:2001-03-14 Online:2001-12-25 Published:2005-07-07
Supported by:
Project supported partly by the National Natural Science Foundation of China (Grant No. 60071017) and the Natural Science Foundation of Beijing, China (Grant No. 2992019).

摘要/Abstract

摘要： The third-order optical nonlinearity of Ag-O-Cs thin films, where Ag nanoparticles are embedded into a Cs_xO semiconductor matrix, was measured by the femtosecond optical Kerr technique. The third-order nonlinear optical susceptibility, $\chi$⁽³⁾, of the thin films was estimated to be 1.1×10^-9 esu at the incident wavelength of 820 nm. The response time, i.e. the full width at half-maximum of the Kerr signal, is as fast as 114 fs only. The intrinsic third-order optical nonlinearity can be attributed to the intraband transition of electrons from the occupied state near the Fermi level to the unoccupied state. It is suggested that such a nonlinearity is further enhanced by the local field effect that is present in the metallic nanoparticles composite thin films.

Abstract: The third-order optical nonlinearity of Ag-O-Cs thin films, where Ag nanoparticles are embedded into a Cs_xO semiconductor matrix, was measured by the femtosecond optical Kerr technique. The third-order nonlinear optical susceptibility, $\chi$⁽³⁾, of the thin films was estimated to be 1.1×10^-9 esu at the incident wavelength of 820 nm. The response time, i.e. the full width at half-maximum of the Kerr signal, is as fast as 114 fs only. The intrinsic third-order optical nonlinearity can be attributed to the intraband transition of electrons from the occupied state near the Fermi level to the unoccupied state. It is suggested that such a nonlinearity is further enhanced by the local field effect that is present in the metallic nanoparticles composite thin films.

Key words: optical Kerr effect, metallic nanoparticles, third-order nonlinearity

中图分类号:

4265

张琦锋, 邵庆益, 侯士敏, 张耿民, 刘惟敏, 薛增泉, 吴锦雷, 王树峰, 梁瑞生, 黄文涛, 王丹翎, 龚旗煌. LARGE AND EXTREMELY FAST THIRD-ORDER NON-LINEARITY OF Ag NANOPARTICLES EMBEDDED INTO A Cs_xO SEMICONDUCTOR MATRIX[J]. 中国物理B, 2001, 10(13): 65-69.

Zhang Qi-feng (张琦锋), Shao Qing-yi (邵庆益), Hou Shi-min (侯士敏), Zhang Geng-min (张耿民), Liu Wei-min (刘惟敏), Xue Zeng-quan (薛增泉), Wu Jin-lei (吴锦雷), Wang Shu-feng (王树峰), Liang Rui-sheng (梁瑞生), Huang Wen-tao (黄文涛), Wang Dan-ling (王丹翎), Gong Qi-huang (龚旗煌). LARGE AND EXTREMELY FAST THIRD-ORDER NON-LINEARITY OF Ag NANOPARTICLES EMBEDDED INTO A Cs_xO SEMICONDUCTOR MATRIX[J]. Chinese Physics, 2001, 10(13): 65-69.

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LARGE AND EXTREMELY FAST THIRD-ORDER NON-LINEARITY OF Ag NANOPARTICLES EMBEDDED INTO A Cs_xO SEMICONDUCTOR MATRIX

LARGE AND EXTREMELY FAST THIRD-ORDER NON-LINEARITY OF Ag NANOPARTICLES EMBEDDED INTO A Cs_xO SEMICONDUCTOR MATRIX

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