Klyukin Dmitry, Silvennoinen Martti, Krykova Victoria, Svirko Yuri, Sidorov Alexander, Nikonorov Nikolay
Opt Express. 2017 May 29;25(11):12944-12951. doi: 10.1364/OE.25.012944.
We report photoluminescence in bulk chloride photo-thermo-refractive glass under irradiation with femtosecond laser pulses. The fluorescence originates from the bleaching of silver nanoparticles precipitating in the glass. Similarly to the conventional process of the femtosecond re-shaping of metal inclusions with diameter tens of nanometers, irradiation of the smaller nanoparticles results in a fast shrinking size with an ellipsoidal shape via photofragmentation. Under UV excitation, remaining sub-nanometer silver molecular clusters show visible and near IR fluorescence, which increases with chlorine concentration. The observed bleaching of silver nanoparticles in bulk glass-metal nanocomposite can find applications in data storage and bleaching of volume Bragg gratings.
我们报道了在飞秒激光脉冲照射下块状氯化物光热折射玻璃中的光致发光现象。荧光源于玻璃中沉淀的银纳米颗粒的漂白。与直径为几十纳米的金属夹杂物的传统飞秒重塑过程类似，较小纳米颗粒的照射会通过光碎片化导致尺寸快速收缩并呈椭圆形。在紫外激发下，剩余的亚纳米银分子簇呈现可见光和近红外荧光，且随氯浓度增加。在块状玻璃 - 金属纳米复合材料中观察到的银纳米颗粒漂白可用于数据存储和体布拉格光栅的漂白。
