Observation of Whispering Gallery Modes in InGaN/GaN Multi-Quantum Well Microdisks with Ag Plasmonic Nanoparticles on Si Pedestals

• Published in: Journal of electronic materials Vol. 51; no. 5; pp. 2054 - 2061
• Main Authors: Lee, Kang Jea, Dinh, Duc Anh, Hoa, Huynh Tran My, Phuong, Pham Hoai, Nguyen, Hoang Hung, Hui, Kwan San, Hui, Kwun Nam, Cuong, Tran Viet
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.05.2022; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Electronics and Microelectronics; Excitons; Indium gallium nitrides; Instrumentation; Materials Science; Multi Quantum Wells; Nanoparticles; Optical and Electronic Materials; Optical pumping; Original Research Article; Photoluminescence; Plasmonics; Plasmons; Resonance; Silver; Solid State Physics; Whispering gallery modes; Microdisks; InGaN/GaN multi-quantum wells; whispering gallery modes
• ISSN: 0361-5235; 1543-186X
• DOI: 10.1007/s11664-022-09464-3

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/cm 2 with a WGM mode spacing of Δ λ = 1.3 nm.