udkm1Dsim is capable of simulating strainwaves in samples that a launched after ultrfast laser-heating. Such coherent phonon oscillations can for example be observed in ultrafast X-ray diffraction experiments and as their precise shape provides relevant information on the layer thickness and laser penetration depths.
However when one wants to "quickly optimize" the sample structure by matching the simulated strain pattern to the observed experiments one always needs simulate a substrate that is so thick that the initial shockwaves generated at the sample-air interface are reflected back from the end of the substrate into the thin film.
The longer the simulation runs the thicker the substrate thus needs to be, which makes the simulation slow. Thus it would be very useful if one could set the boundary condition at the end of the substrate such that no strain-waves are reflected. Maybe one could introduce a layer at the end that has per definition zero strain in each timestep and thus works as black hole for sound waves.
Of course this should be an optional feature, which from my perspective would increase the simulation speed since it reduces the substrate thickness that needs to be taken into account.
udkm1Dsim is capable of simulating strainwaves in samples that a launched after ultrfast laser-heating. Such coherent phonon oscillations can for example be observed in ultrafast X-ray diffraction experiments and as their precise shape provides relevant information on the layer thickness and laser penetration depths.
However when one wants to "quickly optimize" the sample structure by matching the simulated strain pattern to the observed experiments one always needs simulate a substrate that is so thick that the initial shockwaves generated at the sample-air interface are reflected back from the end of the substrate into the thin film.
The longer the simulation runs the thicker the substrate thus needs to be, which makes the simulation slow. Thus it would be very useful if one could set the boundary condition at the end of the substrate such that no strain-waves are reflected. Maybe one could introduce a layer at the end that has per definition zero strain in each timestep and thus works as black hole for sound waves.
Of course this should be an optional feature, which from my perspective would increase the simulation speed since it reduces the substrate thickness that needs to be taken into account.