| Summary: | We implement finite difference method (FDM) to calculate the optical cavity effects in InGaN micro-light-emitting diodes (LEDs) with metallic coating. The dispersion relation, mode profile, energy density W of electromagnetic field, cavity quality factor Q , and effective mode area A <sub>ef f</sub> are theoretically investigated. The results show that although the strongest confinement of the field is achieved by surface plasmon modes at GaN/Ag interface, the energy density W is small inside the cavity, leading to a high effective mode area. Additionally, the cavity without metallic coating has the highest Q factors since no metal loss is involved. These results can serve as guidelines for the design and fabrication of high efficiency and high speed LEDs for the applications of solid-state lighting and visible-light communication.
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