Ultrathin MgO-spaced Ag nanocavities for emission enhancement via plasmonic resonance

Japanese Journal of Applied Physics 2026 Open access

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Authors: Peng Sheng, Shota Takahashi, Koki Kanemitsu, Takayuki Kiba, Midori Kawamura
DOI: 10.35848/1347-4065/ae4c34
Cited by: 1
References: 21

Abstract

Abstract We demonstrate a plasmon-enhanced photoluminescence platform based on Ag/MgO/Ag nanocavities formed by simple thermal annealing. A 5 nm MgO spacer preserves the flatness and reflectivity of the bottom Ag layer while enabling nanoparticle formation in the top Ag film. The resulting hybrid plasmon–cavity modes are modified by an overlaid Alq 3 layer, producing spectral matching around 520 nm. Consequently, Alq 3 emission is enhanced six-fold, exceeding the four-fold enhancement obtained with Ag nanoparticles alone. This lithography-free nanocavity provides a robust route toward efficient plasmon-enhanced light-emitting structures.

Fields of Study & Subjects

Plasmonic and Surface Plasmon Research Gold and Silver Nanoparticles Synthesis and Applications Optical Coatings and Gratings

Publication details

Journal / source
Japanese Journal of Applied Physics
Publisher
IOP Publishing
Volume
65
Issue
6
Pages
068001–068001
Publication date
2 March 2026