Focusing properties of mushroom microlenses

TL;DR

This paper investigates the electromagnetic focusing properties of mushroom-shaped microlenses using boundary integral equations, demonstrating their potential to enhance LED output efficiency and directivity through rigorous numerical analysis.

Contribution

It provides a detailed electromagnetic analysis of mushroom microlenses with rigorous boundary integral methods, confirming their focusing capabilities and potential for LED enhancement.

Findings

Mushroom microlenses can effectively focus light.

Numerical simulations show evolution of focal spots and near fields.

Potential to improve LED output efficiency and directivity.

Abstract

Focusing properties of a novel type photoresist microlens are studied. A specific character of the microlens is its mushroom shape. Recently it was predicted and experimentally revealed that such a lens integrated with a light-emitting diode is capable of enhancing its output efficiency and directivity. In our paper we describe the true electromagnetic performance of a mushroom lens by applying a mathematically rigorous method of boundary integral equations. Numerical results are presented for the mushroom lens illuminated with a plane E-polarized wave and include figures describing the evolution of the lens focal spot and near field maps.