Enhancement of the bandgap emission from GaN epilayer by surface plasmon resonance in the quadrupole oscillation mode using Ag nanoparticles protected by an oxide thin film

材料科学 表面等离子共振 光致发光 光电子学 薄膜 纳米颗粒 等离子体子 激子 表面等离子体子 带隙 时域有限差分法 基质(水族馆) 发光 宽禁带半导体 电场 四极 纳米技术 光学 凝聚态物理 物理 地质学 海洋学 量子力学 原子物理学
作者
Seiya Kaito,Tomohiro Matsuyama,Kenji Wada,Mitsuru Funato,Yoichi Kawakami,Koichi Okamoto
出处
期刊:Applied Physics Letters [American Institute of Physics]
卷期号:122 (15)
标识
DOI:10.1063/5.0143725
摘要

Surface plasmons resonance is a promising way to improve the luminescence efficiency of light-emitting materials including InGaN/GaN-based quantum wells; however, it has rarely been used for GaN epilayer with metal nanoparticles (NPs). We demonstrated in enhancing the bandgap emission from GaN epilayer by localized surface plasmon resonance (LSPR) in a quadrupole oscillation mode using Ag NPs fabricated on the GaN. The shapes of the Ag NPs fabricated on the GaN substrates gradually changed over time and were eventually destroyed completely. This should be the reason why previous studies of enhancement of GaN-based materials by using Ag NPs have not performed as good results as expected. This problem was solved by employing oxide thin films to protect the Ag NPs from destruction or aggregation and obtain enhanced photoluminescence of the GaN epilayer. The localized and enhanced electric fields have been calculated by the finite difference time domain (FDTD) method to elucidate the enhancement mechanism. However, it has been still difficult to use this method to reproduce the enhanced emissions caused by the quantum interaction between the surface plasmons and excitons. We reproduced the highly efficient emissions attributed to the Purcell effect by evaluating the nanoantenna effect using the FDTD method. This technique confirmed that an oxide thin film between the GaN substrate and Ag NPs played an effective role in the local enhancement of the electromagnetic field and light extraction from the LSPR mode when several types of oxide thin films were considered.
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