期刊
ACS NANO
卷 3, 期 12, 页码 4062-4070出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn900654v
关键词
laser-induced near-subwavelength ripples; surface plasmons; SP-laser interference; grating-assisted SP-laser coupling; high-excited surface; nano-optics
类别
资金
- Shanghai Institute of Optics and Fine Mechanics (SIOM)
- Chinese Academy of Sciences (CAS)
We show that short-pulse laser-induced classical ripples on dielectrics, semiconductors, and conductors exhibit a prominent non-classical characteristic-in normal incidence the periods are definitely smaller than laser wavelengths, which indicates that the simplified scattering model should be revised. Taking into account the surface plasmons (SPs), we consider that the ripples result from the initial direct SP-laser interference and the subsequent grating-assisted SP-laser coupling. With the model, the period-decreasing phenomenon originates in the admixture of the field-distribution effect and the grating-coupling effect. Further, we propose an approach for obtaining the dielectric constant, electron density, and electron collision time of the high-excited surface. With the derived parameters, the numerical simulations are in good agreement with the experimental results. On the other hand, our results confirm that the surface irradiated by short-pulse laser with damage-threshold fluence should behave metallic, no matter for metal, semiconductor, or dielectric, and the short-pulse laser-induced subwavelength structures should be ascribed to a phenomenon of nano-optics.
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