Gain-Assisted Plasmon Resonance Narrowing and Its Application in Sensing
2019; American Physical Society; Volume: 11; Issue: 4 Linguagem: Inglês
10.1103/physrevapplied.11.044030
ISSN2331-7043
AutoresLijun Meng, Ding Zhao, Yuanqing Yang, F. Javier Garcı́a de Abajo, Qiang Li, Zhichao Ruan, Min Qiu,
Tópico(s)Gold and Silver Nanoparticles Synthesis and Applications
ResumoThe realization of ultranarrow-band perfect absorption using tiny plasmonic structures can benefit the integration of high-$Q$ light absorbers, although it is still challenging. Ultranarrow absorption traditionally relies on lattice resonances, while small absorbers typically support broad localized resonances. Here the authors propose combining high-order plasmons beyond dipolar ones in localized resonances and optical-gain media. The absorbers they design are excellent index sensors that improve sensing of minute amounts of analytes. These results should stimulate researchers to customize absorption in plasmonic systems by leveraging elaborate mode structures and optical gain.
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