Realization of regular resonance mode in GaN-based polygonal microdisks on Si

Regular resonance modes in GaN-based polygonal microdisks are investigated by simulations and photoluminescence measurements. Based on a standard GaN-based blue light emitting diode wafer on a Si substrate, hexagonal and octagonal microdisks with similar dimensions are fabricated. Whispering gallery-like modes and Fabry–Pérot modes in the polygonal microcavities are pictured by theoretical calculations. All resonant modes in the polygonal...