fherreralab / organic-microcavity-spectra

Computes the transmission, reflection and absorption spectra of a planar microcavities compose of dielectric spacers, organic absorbers and metal or dielectric mirrors. Observables are obtained using the transfer matrix (TMM) method.

Multi-Layer Transfer Matrix Method

Computes the transmission, reflection and absorption spectra of a planar microcavities compose of dielectric spacers, non-active organic absorbers and metal or dielectric mirrors. Observables are obtained using the transfer matrix (TMM) method.

Overview

The transfer matrix method (TMM) for a multi-layer structure is implemented using the field normalization conventions in Chap. 2 of H.A. Macleod's "Thin-Film Optical Filters" (3rd Ed, Taylor & Francis).

Input Number of layers that compose the microcavity structure, their thickness, and the complex dielectric functions of all materials involved over the wavelengths of interest.

Output For a given input field incidence angle and field polarization (TM or TE), the code computes the transmission, reflection and absorption spectra over a frequency region of interest. Dispersion curves are obtained by varying the angle of incidence.

Matlab folder

The folder "matlab" contains example Matlab code (Intensidad.m) for computing the reflectance, transmitance, and absorptance of an L = 180 nm silver metal microcavity with a TDBC absorptive layer and silica spacers, as illustrated below:

Python folder

The folder "python" contains general code that can be expanded to introduce an arbitrary number of dielectric layers with user-defined dielectric functions.

Two main .py scripts are provided: The file "TMM.py" has the functions needed to compute the observables of a given cavity using the functions defined in the file "dielectric_functions.py".

Jupyter Notebook: TDBC Case Example

The jupyter notebook "intensity.ipynb" in the "python" folder illustrates the use of the python modules, by computing the transmission (T), reflection (R), and absorption spectra (1-R-T) of a silver microcavity with TDBC molecular aggregates, as a function of pump incidence angle (dispersion plots).

References

This code was developed by Iván Jara (Eng. Phys) as part of the undergraduate thesis "Simulación computacional de la eficiencia óptica de estructuras OLED", Universidad de Santiago de Chile, 2019.