Udkm1Dsim is a great package when it comes to simulating heat flow and the resulting lattice response after the laser excitation. However the provided laser excitation pattern has the weakness that it often only assumes Lambert-Beer like exponentially decaying intensity profiles.
In bi- or multilayer thin films it is known that the absorption profiles differ strongly from Lambert-Beer behavior due to interference, multireflections and possibly negative real parts of the refractive indices
For discussions see for example:
As the authors of Khorsand, A. R., et al. Nature materials 13.2 (2014): 101. beautifully phrased it:
"Knowledge of the exact absorption profile is crucial to disentangle thermal and non-thermal phenomena [...]" in a response to Eschenlohr, A., et al. Nature materials 12.4 (2013): 332.
A full transfer matrix calculation of the excitation pattern and the resulting energy deposition is highly desirable to make the simulations more realistic. A scheme for a correct absorption profile calculation has been proposed in the publication by Windt, David L. "IMD—Software for modeling the optical properties of multilayer films." Computers in physics 12.4 (1998): 360-370.
This has already been implemented by Loïc Le Guyader in a multilayer absoprtion package based on on the method by K. Ohta and H. Ishida, Appl. Opt. 29, 2466 (1990) and successfully applied in Co/SmFeO3 heterostructures see (Phys. Rev. B 87, 054437 (2013)).
Other implementations in python also exist (see https://pypi.python.org/pypi/tmm ).
It would be very enriching to this package if one would have the option to use the more realistic excitation pattern based on the complex index of refraction for each of the constituent materials.
Inferfacing excisting codes with the udkm1Dsim toolbox would strongly facilitate realistic simulations of the energy flow and lattice response of laser excited thin film samples.
Udkm1Dsim is a great package when it comes to simulating heat flow and the resulting lattice response after the laser excitation. However the provided laser excitation pattern has the weakness that it often only assumes Lambert-Beer like exponentially decaying intensity profiles.
In bi- or multilayer thin films it is known that the absorption profiles differ strongly from Lambert-Beer behavior due to interference, multireflections and possibly negative real parts of the refractive indices
For discussions see for example:
As the authors of Khorsand, A. R., et al. Nature materials 13.2 (2014): 101. beautifully phrased it:
"Knowledge of the exact absorption profile is crucial to disentangle thermal and non-thermal phenomena [...]" in a response to Eschenlohr, A., et al. Nature materials 12.4 (2013): 332.
A full transfer matrix calculation of the excitation pattern and the resulting energy deposition is highly desirable to make the simulations more realistic. A scheme for a correct absorption profile calculation has been proposed in the publication by Windt, David L. "IMD—Software for modeling the optical properties of multilayer films." Computers in physics 12.4 (1998): 360-370.
This has already been implemented by Loïc Le Guyader in a multilayer absoprtion package based on on the method by K. Ohta and H. Ishida, Appl. Opt. 29, 2466 (1990) and successfully applied in Co/SmFeO3 heterostructures see (Phys. Rev. B 87, 054437 (2013)).
Other implementations in python also exist (see https://pypi.python.org/pypi/tmm ).
It would be very enriching to this package if one would have the option to use the more realistic excitation pattern based on the complex index of refraction for each of the constituent materials.
Inferfacing excisting codes with the udkm1Dsim toolbox would strongly facilitate realistic simulations of the energy flow and lattice response of laser excited thin film samples.