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Surface plasmon‐enhanced micro‐cylinder mode in photonic quasi‐crystal

Two‐dimensional micro‐cylinder patterns of dodecagonal photonic quasi‐crystal (12‐PQC) and tetragonal photonic crystal (2‐PC) were fabricated on the top surface of a GaN light‐emitting diode (LED). The patterns were evaporated with a 10‐nm‐thick Ag film. Spatially resolved surface emission was recorded and analysed by scanning near‐field optical microscopy. Electromagnetic energy was confined and enhanced at the top surface when the surface plasmon (SP) resonated. The enhancement factor for 12‐PQC was 1.9 times that of 2‐PC, 8.6 times that of non‐patterned LED in the near field and 6.7 times in the far field, respectively. Finite‐difference time‐domain simulations are consistent with the experimental data. The results show that with a patterned structure on the top surface of an LED, the light emission can be greatly enhanced due to SP resonance.