SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF TITANIUM DIOXIDE NANOPARTICLES AND NANOPARTICLES-DYE COMPOSITES

中国物理B ›› 2001, Vol. 10 ›› Issue (13): 54-58.

SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF TITANIUM DIOXIDE NANOPARTICLES AND NANOPARTICLES-DYE COMPOSITES

崔一平¹, 汪昕², 张宇², 邓慧华², 沈耀春², 陆祖宏²

(1)Laboratory of Optoelectronic Technology, Southeast University, Nanjing 210096, China; (2)National Laboratory of Molecular and Biomolecular Electronics, Southeast University, Nanjing 210096, China

收稿日期:2001-01-01 出版日期:2001-12-25 发布日期:2005-07-07

SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF TITANIUM DIOXIDE NANOPARTICLES AND NANOPARTICLES-DYE COMPOSITES

Wang Xin (汪昕)^a, Zhang Yü (张宇)^a, Deng Hui-hua (邓慧华)^a, Shen Yao-chun (沈耀春)^a, Lu Zu-hong (陆祖宏)^a, Cui Yi-ping (崔一平)^b

^a National Laboratory of Molecular and Biomolecular Electronics, Southeast University, Nanjing 210096, China; ^b Laboratory of Optoelectronic Technology, Southeast University, Nanjing 210096, China

Received:2001-01-01 Online:2001-12-25 Published:2005-07-07

摘要/Abstract

摘要： Hyper-Rayleigh Scattering (HRS) technique was used to study the second-order nonlinear optical (NLO) responses of aqueous titanium dioxide (TiO₂) nanoparticles of 10nm in size, and two nanoparticles-dye composites prepared by adding rhodamine B (Rh610) or the organic tosylate salt of dimethylaminostilbazolium (DAST). Results showed that the "per particle" first hyperpolarizability β for TiO₂ nanoparticles is very large, in the range of 10²⁶ esu. With adding Rh610 and DAST, the HRS signals of the composites were further enhanced. And in TiO₂/Rh610 composite the enhancement was obviously greater than that of TiO₂/DAST composite. It has proved that non-centrosymmetry of the nanocrystal/solution interface contributes mainly to its large "per particle" β, overwhelming the nanocrystal core. So the interactions between nanoparticles surfaces and adsorbed dyes were very important for their second-order NLO responses. HRS technique provides a useful new NLO method to characterize the surface structures and microenvironment of nanoscale materials.

Abstract: Hyper-Rayleigh Scattering (HRS) technique was used to study the second-order nonlinear optical (NLO) responses of aqueous titanium dioxide (TiO₂) nanoparticles of 10nm in size, and two nanoparticles-dye composites prepared by adding rhodamine B (Rh610) or the organic tosylate salt of dimethylaminostilbazolium (DAST). Results showed that the "per particle" first hyperpolarizability $\beta$ for TiO₂ nanoparticles is very large, in the range of 10²⁶ esu. With adding Rh610 and DAST, the HRS signals of the composites were further enhanced. And in TiO₂/Rh610 composite the enhancement was obviously greater than that of TiO₂/DAST composite. It has proved that non-centrosymmetry of the nanocrystal/solution interface contributes mainly to its large "per particle" $\beta$, overwhelming the nanocrystal core. So the interactions between nanoparticles surfaces and adsorbed dyes were very important for their second-order NLO responses. HRS technique provides a useful new NLO method to characterize the surface structures and microenvironment of nanoscale materials.

Key words: nanoparticle, nanoparticle-dye composites, hyper-Rayleigh scattering (HRS), first hyper-polarizability ($\beta$), nonlinear optics

中图分类号:

6146

汪昕, 张宇, 邓慧华, 沈耀春, 陆祖宏, 崔一平. SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF TITANIUM DIOXIDE NANOPARTICLES AND NANOPARTICLES-DYE COMPOSITES[J]. 中国物理B, 2001, 10(13): 54-58.

Wang Xin (汪昕), Zhang Yü (张宇), Deng Hui-hua (邓慧华), Shen Yao-chun (沈耀春), Lu Zu-hong (陆祖宏), Cui Yi-ping (崔一平). SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF TITANIUM DIOXIDE NANOPARTICLES AND NANOPARTICLES-DYE COMPOSITES[J]. Chinese Physics, 2001, 10(13): 54-58.

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SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF TITANIUM DIOXIDE NANOPARTICLES AND NANOPARTICLES-DYE COMPOSITES

SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF TITANIUM DIOXIDE NANOPARTICLES AND NANOPARTICLES-DYE COMPOSITES

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