表面等离子体激元
激光器
表面等离子体子
等离子体子
材料科学
纳米光子学
光学
吸收(声学)
超快激光光谱学
超短脉冲
局域表面等离子体子
光电子学
物理
作者
Pavel N. Terekhin,O. Benhayoun,Sebastian T. Weber,Dmitry Ivanov,Martín E. Garcia,Baerbel Rethfeld
标识
DOI:10.1016/j.apsusc.2019.144420
摘要
The accurate calculation of laser energy absorption during femto- or picosecond laser pulse experiments is very important for the description of the formation of periodic surface structures. On a rough material surface, a crack or a step edge, ultrashort laser pulses can excite surface plasmon polaritons (SPP), i.e. surface plasmons coupled to a laser-electromagnetic wave. The interference of such plasmon wave and the incoming pulse leads to a periodic modulation of the deposited laser energy on the surface of the sample. In the present work, within the frames of a Two Temperature Model we propose the analytical form of the source term, which takes into account SPP excited at a step edge of a dielectric-metal interface upon irradiation of an ultrashort laser pulse at normal incidence. The influence of the laser pulse parameters on energy absorption is quantified for the example of gold. This result can be used for nanophotonic applications and for the theoretical investigation of the evolution of electronic and lattice temperatures and, therefore, of the formation of surfaces with predestined properties under controlled conditions.
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