Observation of whispering gallery modes in InGaN/GaN multi-quantum well microdisks with Ag plasmonic nanoparticles on Si pedestals

Kang Jea Lee, Duc Anh Dinh, Huynh Tran My Hoa, Pham Hoai Phuong, Hoang Hung Nguyen, Kwan San Hui, Kwun Nam Hui, Tran Viet Cuong

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1 Citation (Scopus)


In this study, plasmonic freestanding InGaN/GaN multi-quantum well (MQW) microdisks were fabricated on Si (111) pedestals using wet chemical undercut etching, followed by decorating of Ag nanoparticles on microdisks to improve whispering gallery mode (WGM) resonance emission. The enhancement resulted from the plasmonic coupling effect between excitons in MQWs and localized surface plasmons of Ag. The radial resonance of WGMs from optically pumped microdisk cavities were observed in the photoluminescence spectra at a threshold optical pumping power density of 4.7 kW/cm2 with a WGM mode spacing of Δλ = 1.3 nm.

Original languageEnglish
Pages (from-to)2054-2061
Number of pages8
JournalJournal of Electronic Materials
Issue number5
Early online date11 Feb 2022
Publication statusPublished - May 2022


  • InGaN/GaN multi-quantum wells
  • Microdisks
  • whispering gallery modes

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