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Whispering gallery mode in periodic InGaN‐based hexagonal nanoring arrays grown by rf‐MBE using Ti‐mask selective‐area growth

We fabricated periodic InGaN‐based hexagonal nanoring arrays by rf‐molecular beam epitaxy (rf‐MBE) with Ti‐mask selective‐area growth (SAG). Multiple photoluminescence peaks from InGaN‐based hexagonal nanorings were observed in room temperature photoluminescence (RT‐PL) measurements with a 325 nm He–Cd laser. We employed a simple plane wave model and a two‐dimensional finite difference time domain (2D‐FDTD) method in the numerical analysis to investigate these multiple peaks. Experimental data was in good coincidence with calculated data, evincing that whispering gallery modes (WGMs) supported in the InGaN‐based hexagonal nanorings were responsible for the multipeaks.