Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6201
Title: Cubic to amorphous transformation of Se in silica with improved ultrafast optical nonlinearity
Authors: Ann Mary, K.A.
Unnikrishnan, N.V.
Philip, Reji
Issue Date: 8-Jan-2015
Publisher: Royal Society of Chemistry
Citation: RSC Advances, 2015, Vol. 5, p 14034- 14041
Abstract: We report a cubic to amorphous transformation of selenium in silica xerogel prepared through a sol–gel route. The crystalline nature of the nanoparticles examined from the SAED pattern and HRTEM revealed an α-cubic structure. The band gap energies calculated from the UV-vis absorption measurements showed a higher band gap of 3.5 eV for the cubic form compared to 2.4 eV for the amorphous form. The ultrafast optical nonlinearity of the samples was investigated by an open aperture Z-scan at 800 nm using 100 fs laser pulses. Although doping with cubic Se did not improve the optical limiting efficiency of silica xerogels, doping with amorphous Se results in substantial enhancement. Numerical analysis of the Z-scan data attributed the nonlinearity to two-photon and three-photon absorption and two-photon induced free carrier absorption. These intensity-dependent, instantaneous nonlinearities make amorphous Se doped silica xerogels attractive candidates for the design of ultrafast optical limiter devices.
Description: Restricted Access.
URI: http://hdl.handle.net/2289/6201
ISSN: 2046-2069 (Online)
Alternative Location: http://dx.doi.org/10.1039/C4RA14025G
Copyright: 2015 Royal Society of Chemistry
Appears in Collections:Research Papers (LAMP)

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