Enhanced stimulated emission from optically pumped gallium nitride nanopillars

Ming Hua Lo*, Yuh Jen Cheng, Hao-Chung Kuo, Shing Chung Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We report the observation of an enhanced stimulated emission from optically pumped GaN nanopillars. The nanopillars were fabricated from an epitaxial wafer by patterned etching followed by crystalline regrowth. When the sample was optically excited, a strong stimulated emission peak emerged from a broad spontaneous emission background. The emission was attributed to electron-hole plasma gain at high carrier density. The emission slope efficiency was greatly enhanced by 20 times compared with a GaN substrate under the same pumping configuration. We remark that the enhancement is due to better gain and photon interaction from the multiple scattering of photons among nanopillars.

Original languageEnglish
Article number022102
JournalApplied Physics Express
Issue number2
StatePublished - 1 Feb 2011

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