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Thermal response and optical absorptance of metals under femtosecond laser irradiation

Natural Science 2011年第6期3卷 488-495页

作者： Anatoliy Y Vorobyev Chunlei Guo 不详

A detailed study on correlation between residual thermal response of a sample and its optical absorptance change due to laser-induced sur-face structural modifications in multi-shot fem-tosecond laser irradiation is performed. Ex-periments reveal an overall enhancement for residual thermal coupling and absorptance in air. Surprisingly, residual thermal coupling in air shows a non-monotonic dependence on pulse number and reaches a minimum value after a certain number of pulses, while these behaviors are not seen in absorptance. In vacuum, how-ever, both suppression and enhancement are seen in residual energy coupling although ab-sorptance is always enhanced. From these ob-servations, it appears that air plasma plays a dominant role in thermal coupling at a relatively low number of applied pulses, while the forma-tion of craters plays a dominant role at a high number of pulses.

关键词： Femtosecond Laser Ablation Residual Energy absorptance Surface Structures

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Effect of geometric parameters and grazing incidence on magnetic polaritons excited in 1D multi-groove gratings

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Science China(Technological Sciences) 2021年第8期64卷 1589-1598页

作者： Su ChengShuai Fu CeJi LTCS and Department of Mechanics and Engineering Science College of EngineeringPeking UniversityBeijing100871China

In this paper,effect of geometric parameters and grazing incidence on excitation of magnetic polaritons(MPs)in a 1D multigroove grating with different groove depths made of silver was *** results reveal that when the distance between grooves is sufficiently small,the resonance wavelengths of MPs excited in the grooves of unequal depths exhibit red shift with decrease of the distance,contrary to the case with equal groove *** shift of the MP resonance wavelengths was explained with the LC circuit ***,it was found that the resonance wavelengths of MPs depend linearly on the groove depths except when the difference between the groove depths is *** the grooves have equal depths,a large drop of the absorptance can occur due to the interaction and cancellation of the electric field vectors in the region between the ***,the results show that when a TM wave is at grazing incidence,MPs can be excited simultaneously in the grooves at a blue-shifted wavelength due to reduction of the effective capacitance,resulting in a dramatic enhancement of the ***,the results in this work may provide useful guidance in the design of wavelength-selective absorbers based on MPs.

关键词： multi-groove grating magnetic polaritons absorptance LC circuit model

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Thermal stability of nitride solar selective absorbing coatings used in high temperature parabolic trough current

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Science China(Technological Sciences) 2010年第6期53卷 1507-1512页

作者： HAO Lei,DU Miao,LIU XiaoPeng,WANG ShuMao,JIANG LiJun,Lü Fang,LI ZhiNian & MI Jing Department of Energy Material and Technology,General Research Institute for Nonferrous Metals,Beijing 100088,China Department of Energy Material and Technology General Research Institute for Nonferrous Metals Beijing China

This paper reports a new efficient solar selective surface in high temperature *** influence of the monolayer's microstructure and deposition rate was firstly *** the nitride nano-multilayer on the polished stainless steel (herein after referred as "SS") substrate was prepared with Ti and Al metal targets by *** *** *** samples were annealed in air at different temperatures ranging from 350 to 800°C for 2 h to evaluate their thermal *** samples' surface and cross-section morphology,crystal structure,phase composition,optical properties were analyzed by scanning electron microscopy,X-ray diffraction,UV-VIS-NIR spectrophotometer and infrared emissivity *** results show that the coatings exhibit high solar selectivity (α/ε) of 0.943/0.08 even after heat-treatment up to 400°C for 2 h in *** heat-treatment at 600°C in air,the solar selectivity decreases to 0.92/0.16.

关键词： solar energy nitride coatings solar absorptance thermal emittance thermal degradation

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