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首页> 外文期刊>Optics Letters >Femtosecond double-pulse fabrication of hierarchical nanostructures based on electron dynamics control for high surface-enhanced Raman scattering
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Femtosecond double-pulse fabrication of hierarchical nanostructures based on electron dynamics control for high surface-enhanced Raman scattering

机译:飞秒双脉冲制造基于电子动力学控制的高表面增强拉曼散射的分层纳米结构

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摘要

This Letter presents a simple, efficient approach for high surface-enhanced Raman scattering by one-step controllable fabrication of hierarchical structures (nanoparticles + subwavelength ripples) on silicon substrates in silver nitrate solutions using femtosecond double pulses based on nanoscale electron dynamics control. As the delays of the double pulses increase from 0 fs to 1 ps, the hierarchical structures can be controlled with (1) nanoparticles - the number of nanoparticles in the range of 40-100 nm reaches the maximum at 800 fs and (2) ripples - the subwavelength ripples become intermittent with decreased ablation depths. The redistributed nanoparticles and the modified ripple structures contribute to the maximum enhancement factor of 2.2 × 10~8 (measured by 10~(-6) M rhodamine 6G solution) at the pulse delay of 800 fs.
机译:这封信提出了一种简单有效的方法,可通过飞秒双脉冲基于纳米级电子动力学控制,在硝酸银溶液中在硅基板上一步控制可制造的分层结构(纳米颗粒+亚波长波纹),以实现高表面增强拉曼散射。随着双脉冲的延迟从0 fs增加到1 ps,可以用(1)纳米颗粒控制分层结构-40-100 nm范围内的纳米颗粒数量在800 fs时达到最大值,并且(2)波纹-随着消融深度的减小,亚波长波纹变得间歇性的。在800 fs的脉冲延迟下,重新分布的纳米颗粒和修饰的波纹结构有助于最大增强因子2.2×10〜8(由10〜(-6)M罗丹明6G溶液测量)。

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