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Spectral absorption control of femtosecond laser-treated metals and application in solar-thermal devices

机译:飞秒激光处理金属的光谱吸收控制及其在太阳热装置中的应用

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摘要

Using low pulse number and lower fluence, the created surface nanostructures are smaller in size and less dense than the surface nanostructures formed using high pulse number and higher fluence. Under optical excitation, larger and denser particles hybridise, and their near-field couples leading to a shift in the plasmon resonance. The calculated absorption for a single W nanoparticle as a function of the particle size highlighting the relevance of the size effect on the broadness of the measured plasmon resonance. The calculated absorption of four hybridized W nanoparticles with a radius of 100 nm as a function of the gap distance between the nanoparticles. A smaller gap leads to stronger hybridisation and redshifts the plasmon resonance peak to higher wavelengths. Both the size and hybridisation effects broaden the measured resonance for randomly distributed nano-surface structures.
机译:与使用高脉冲数和较高通量形成的表面纳米结构相比,使用低脉冲数和较低通量的产生的表面纳米结构在尺寸上较小并且密度较小。在光激发下,更大,更密集的粒子杂交,它们的近场耦合导致等离子体激元共振的移动。计算出的单个W纳米粒子的吸收与粒径的关系,突显了尺寸效应与测得的等离振子共振宽度之间的相关性。四个杂化的W纳米粒子的半径为100 thenm的吸收计算值与纳米粒子之间的间隙距离有关。较小的间隙导致更强的杂交并使等离激元共振峰红移至更高的波长。尺寸和杂交效应都扩大了随机分布的纳米表面结构的测量共振。

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