Refractive index changes in photochromic SbPO4-WO3 glass by exposure to band-gap radiation
Refractive index changes in photochromic SbPO4-WO3 glass by exposure to band-gap radiation
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DOI：
10.1016/j.jnoncrysol.2010.02.017
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发表时间：
2010-10
影响因子：
3.5
通讯作者：
Meenu Ahlawat;G. Vázquez;M. Nalin;Y. Messaddeq;S. Ribeiro;R. Kashyap
中科院分区：
文献类型：
--
作者：
Meenu Ahlawat;G. Vázquez;M. Nalin;Y. Messaddeq;S. Ribeiro;R. Kashyap
本文报道了在功率密度为143 mW/cm ~ 2的532 nm光照射下，SbPO_4-WO_3玻璃的光致暗化现象。暴露时间在0和256分钟之间变化，随后观察到可见光暗化，峰值在850 nm处。对样品的处理和未处理区域进行吸收的分光光度计测量。时间暴露于低于带隙的光导致在非常宽的波长范围（500 nm-1600 nm）内的单指数高斯吸收函数，1/e宽度为647.5 nm。吸收变化的Kramers-Kronig变换表明折射率的负局部变化。在1550 nm处的色散折射率变化Δ n计算为Δ n −5×10−8。峰值吸收随暴露时间增加，并且光暗化在室温下保持不可逆。
We report photoinduced photo-darkening in SbPO4–WO3glass by exposure to 532nm light with a power density of 143mW/cm2. The time of exposure was varied between 0 and 256min following which visible photo-darkening, peaking at 850nm was observed. Spectrophotometer measurement of absorption was performed for both treated and untreated regions of the sample. Time exposure to below band-gap light results in a single exponent Gaussian absorption function over an exceptionally wide range of wavelengths (500nm–1600nm), with a 1/e width of 647.5nm. Kramers–Kronig transform of the change in the absorption indicates a negative local change in the refractive index. The dispersed refractive index change at 1550nm, ∆n, is calculated to be ∼−5×10−8. The peak absorption increases with time of exposure and the photo-darkening remains irreversible at room temperature.