Transient laser-based surface acceleration simulations for particle removal

Abstract

The effectiveness of traditional surface cleaning methods, such as ultrasonically induced fluid flow, vibration methods, centrifugal techniques, is limited to particles that require surface acceleration lower than 107 m/s2. For sub-micrometer particles, a higher level of surface acceleration is needed. In this work, based on the generalized dynamic theory of thermoelasticity, a transfer matrix formulation including the second sound effect is developed for a layer. The transfer matrix for axisymmetric wave propagation in the thermoelastic layer is obtained by adopting integral transforms. The second sound effect is included to eliminate the immediate arrival of thermal waves. A transfer function formulation along with inverse integral transform routines is used for calculating transient accelerations due to thermoelastic loading of a pulsed laser. Results demonstrating that high level acceleration can be obtained are presented for a thermoelastic layer.