Commenced in January 2007
Paper Count: 30178
Optical Limiting Characteristics of Core-Shell Nanoparticles
Abstract:TiO2 nanoparticles were synthesized by hydrothermal method at 180°C from TiOSO4 aqueous solution with1m/l concentration. The obtained products were coated with silica by means of a seeded polymerization technique for a coating time of 1440 minutes to obtain well defined [email protected] core-shell structure. The uncoated and coated nanoparticles were characterized by using X-Ray diffraction technique (XRD), Fourier Transform Infrared Spectroscopy (FT-IR) to study their physico-chemical properties. Evidence from XRD and FTIR results show that SiO2 is homogenously coated on the surface of titania particles. FTIR spectra show that there exists an interaction between TiO2 and SiO2 and results in the formation of Ti-O-Si chemical bonds at the interface of TiO2 particles and SiO2 coating layer. The non linear optical limiting properties of TiO2 and [email protected] nanoparticles dispersed in ethylene glycol were studied at 532nm using 5ns Nd:YAG laser pulses. Three-photon absorption is responsible for optical limiting characteristics in these nanoparticles and it is seen that the optical nonlinearity is enhanced in core-shell structures when compared with single counterparts. This effective three-photon type absorption at this wavelength, is of potential application in fabricating optical limiting devices.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1076464Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1427
 Tutt L W and Boggess T F, "A review of optical limiting mechanisms and devices using organics , fullerenes, semiconductors and other materials," Prog. Quantum. Electron. 1993; 17: 299-338.
 Perry J W, Nonlinear optics of organic molecules and polymers. Chap.13 (NewYork: CRC Press; 1997.
 Ralston J M and Chang R K, Appl. Phys. Lett 1969;15: 164 -66.
 Boggess T F, Jr., Smirl A L, Moss S. C., et al., IEEE J.Quantum Electron 1985; 21: 488-94.
 Said A A, Xia T, Hagan D J, and Van Stryland E W, J. Opt. Soc. Am. B 1997;14: 824-28 .
 Krauss T D and Wise F W, Appl. Phys. Lett 1994;65: 1739-41.
 Suzuki N, Tomita Y, Kojima T, Appl. Phys. Lett 2002;81: 4121-23.
 Liu N N, Sun J M, Pan S H, Chen Z H, Shi W S, Wang R P, Opt. Commun 2000;176: 239-43.
 Prakash G V, Cazzanelli M, Gaburro Z, Pavesi L, Iacona F, Franzo G, J. Appl. Phys 2002;91: 4607-10.
 Lettieri S, Fiore O, Maddalena P, Ninno D, Di Francia G, Opt. Commun 1999;168:383-91.
 He J, Ji W, Ma G H, Tang S H, Elim H I, Sun W X, Zhang Z H, J. Appl. Phys 2004;95: 6381-86.
 Chemla D S, Miller D A B, Opt. Lett 1986;11: 522-24.
 Yu J G, Zhao X J , Yu J C, Zhong G R, J. Mat. Sci. Lett 2001;20: 1745- 48.
 Dutoit D C M, Schneider M, Baiker A, J. Catal 1995; 153:165-76.
 Karthikeyan B, Anija M, Reji Philip, Appl. Phys. Lett 2006; 88: 053104-06.