Optimization of Gain through the creation of local deformation zones from polymer membranes
Po-Jui Chen (陳柏叡)1*, Jonathon David White (白小明)1
1Department of Photonics Engineering, Yuan Ze University, Taoyuan, Taiwan
* presenting author:Po-Jui Chen, email:aray.pojui.chen@gmail.com
Understanding and optimizing light propagation, scattering, absorption and extraction in light-emitting systems, such as fluorescent chemical sensors and light emitting diode, is important for the production of more efficient sensors. The emission from light emitting systems is confined by the high refractive index that causes the total internal reflection. Various methods are applied to improve light extraction efficiency such as lens array structure, biomimetic structure and embedded photonic crystals. We employed Monte Carlo ray tracing to model the effects of one dimensional perturbations of film thickness on the luminescent emission (spacial, directional, spectral) of a free standing transparent polymer film embedded with luminescent chromophores. The one dimensional perturbation improved light extraction up to ~240%. Such modification not only enhances light extraction but also allows its location and direction to be controlled. Optimization of the deformation geometry allows for a 3.6-fold increase in intensity for a far-field detector.

Keywords: Thin Films, Photoluminescence , Fluorescence, Ray Tracing