Ultra-short laser ablation of metals and semiconductors: evidence of ultra-fast Coulomb explosion

Surface topography (nano-sized hillocks) and particle emission of metals, dielectrics and semiconductors during ultra-short-laser ablation: Towards a coherent understanding of relevant processes

“…The new data presented in this paper mark a significant step in gaining a coherent understanding of the physics involved. Together with recent results [3][4][5] we could successfully address the questions with regard to the validity of ultra fast electronic (CE, SOR, FEP) and thermal (TA) processes, which have recently been identified via the time behavior of the energy deposition, the composition and energy of the emitted particles [3][4][5]7].…”

“…The appearance of nano-sized hillocks under specific conditions should, therefore, be regarded as an additional and convincing argument for the physics of the various processes presented and discussed in [3][4][5]. Therefore, it is of fundamental interest to study the surface topography as it develops under ultra-short-laser radiation, in particular, close to the ablation threshold.…”

“…have used to explain our experimental data presented in [3][4][5] and which are also the basis for explaining the results in this paper we would like to mention, that in particular with respect to the sub 100 fs processes an alternative explanation (field ion emission by surface optical rectification (SOR)) avoiding some of the problems associated with Coulomb explosion for metals has been recently proposed by Vella et al [6]. Besides the fundamental, a more applied interest exists in studying the resulting surface topography, in particular the possibility of nano-sized hillocks.…”

Thermal and non-thermal explosion in metals ablation by femtosecond laser pulse: classical approach of the Two Temperature Model

“…Since 2002, Stoian et al [11] demonstrated that this kind of explosion is dominant only in the case of dielectrics. In 2006, Dachraoui's et al [12] calculations shown that this kind of explosion exists by evidence in all solids but at different rates: it is very important in dielectrics, moderately weak in semi-conductors, and very weak in metals because of the screening effect.…”

Ultrarövid lézerimpulzusok kölcsönhatása fém és félfém céltárgyakkal

“…Ennek eredményeképpen azt kapták, hogy csak a szigetelı céltárgy, Al 2 O 3 esetén következett be Coulomb-robbanás, és a vizsgált fém (Au), és félfém (Si) céltárgyakban fellépı Coulomb-taszítás nem érte el a kritikus értéket. Ezzel ellentétben azonban nemrégen kimutatták, hogy Al, és Ag fémek esetén is szerepet játszik a Coulomb-robbanás az ablációnál [42]. Ebbıl az a következtetés vonható le, hogy hasonló kísérleti paraméterek mellett a Coulombrobbanás bekövetkezése a céltárgy anyagának a függvénye.…”