Structure and Third-order Optical Nonlinearity Performance of Ge-Sn-Se Doped TiO2 Glass-ceramics at 1550 nm

doi:10.15541/jim20150191

Abstract

Abstract:

TiO₂manifested as nucleating agent was introduced in Ge-Sn-Se ternary chalcogenide glass by heat-melt method. Then the samples were heat-treated for different time. The experiment results indicated that heat treatment process can lead to the precipitation of GeSe₂ monoclinic crystals and SnSe₂ hexagonal crystals in the TiO₂doped Ge-Sn-Se glass with the heat treatment time increasing. The variety of UV cut-off wavelength, optical band gap and Urbach energy revealed that the number of defect units in glass-ceramic samples increased with the increment of heat treatment time. The third-order optical nonlinearity of all samples was measured by Z-scan technology at 1550 nm. The results showed that the formation of nano-crystals in glass-ceramic samples can improve the third-order nonlinear refraction index significantly due to the strong local field effect. The largest value of nonlinear refraction index reached 5.75×10^-16 m²/W, and the sample heat-treated for 3 h was considered as a high-quality nonlinear optical material for its high nonlinear refraction index as well as high figure of merit.

Key words: glass-ceramic, nonlinear optics, chalcogenide glass, infrared and Raman spectra

CLC Number:

TQ174

QIAO Bei-Jing, CHEN Fei-Fei, NIE Qiu-Hua, DAI Shi-Xun, HUANG Yi-Cong. Structure and Third-order Optical Nonlinearity Performance of Ge-Sn-Se Doped TiO₂Glass-ceramics at 1550 nm[J]. Journal of Inorganic Materials, 2015, 30(11): 1189-1194.

Figures/Tables 8

Fig. 1 XRD patterns of samples after heat-treatment at 270℃ for different time

Fig. 2 Raman spectra of TiO2 doped Ge-Sn-Se samples heat- treated for different time Inset is the variation of integrated area from 170 to 210 cm-1 with heat- treatment time

Fig. 3 Absorption spectra of host and glass-ceramic samples Inset is enlarged absorption edge from 707 nm to 721 nm

Fig. 4 Tauc curves and optical band gap Eopg of TiO2 doped Ge-Sn-Se samples affer heat-treatment for different time Inset is variety tendency of Eopgwith heat treatment time

Fig. 5 Urbach energy of TiO2 doped Ge-Sn-Se samples affer heat-treatment for different time

Table 1 Physical properties and nonlinearity parameters of TiO2 doped Ge-Sn-Se glass-ceramic samples

NO.	Density/(g·cm^-3) (±0.001)	E_opg/ eV(±0.001)	E_e/ eV(±0.001)	n₂/ (10^-17m²·W^-1)(±10%)	β/ (10^-12 m·W^-1)(±10%)	FOM (±20%)
GSS-Ti-0	4.492	1.667	0.082	5.59	2.22	16.25
GSS-Ti-3	4.479	1.659	0.087	23.36	4.01	37.58
GSS-Ti-6	4.475	1.652	0.099	57.50	93.73	3.96
GSS-Ti-12	4.451	1.634	0.100	49.24	110.27	2.88
GSS-Ti-18	4.367	--	--	--	--	--
GSS-Ti-30	4.360	--	--	--	--	--
As₂Se₃	--	--	--	1.22	1.20	13.12

Fig. 6 FTIR of samples after heat-treatment for different time

Fig. 7 Closed-aperture Z-scan curves (a) and open-aperture Z-scan curves (b) of TiO2 doped Ge-Sn-Se glass-ceramic samples

References 18

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Structure and Third-order Optical Nonlinearity Performance of Ge-Sn-Se Doped TiO₂Glass-ceramics at 1550 nm

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