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Keywords:

  • 42.60.Da;
  • 78.20.Bh;
  • 78.55.−m;
  • 78.67.Bf;
  • 81.05.Je;
  • 81.15.Hi

Abstract

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.