Investigation of polarized light emitting diodes with integrated wire grid polarizer

Abstract

The polarization properties of light emitting diodes with integrated wire grid polarizers are investigated. Rigorous coupled wave analysis and Monte-Carlo ray tracing are used for modeling the gratings and the entire LED structure respectively. We show that it is more advantageous to place the polarizer onto the LED encapsulation rather than onto the die. With the proposed arrangement the average extinction ratio is 2.37 in the uncollimated case and 76.86 in the collimated case, while the light extraction efficiency is significantly higher than that of the LED + external polarizer combination. The achieved results compare favorably to other polarized LED solutions proposed in the literature.