Hybrid plasmonic microcavity with an air-filled gap for sensing applications

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• 作者：Meng Zhang^a ; ^b ; Binbin Liu^a ; ^b ; Genzhu Wu^a ; ^b ; ^c ; ^{wugenzhu@zjnu.cn" class="auth_mail" title="E-mail the corresponding author} ; Daru Chen^a ; ^b
• 关键词：Hybrid plasmonic microcavity ; Hybrid plasmonic mode ; Quality factor ; Effective mode volume ; High sensitive sensor
• 刊名：Optics Communications
• 出版年：2016
• 出版时间：1 December 2016
• 年：2016
• 卷：380
• 期：Complete
• 页码：6-9
• 全文大小：975 K

文摘

In this paper, a novel hybrid plasmonic microcavity with air-filled regions in the low-permittivity dielectric gap is proposed for sensing applications. Compared with the conventional structure with homogeneous gap, the introduced air-filled regions could improve the key modal characteristics of the hybrid mode. Simulation results reveal that this kind of hybrid microcavity maintains low loss with high quality factor ∼3062, and high field confinement with small mode volume 0.891 µm³. Moreover, in the sensing applications, this hybrid microcavity features simultaneously large refractive index sensitivity of 100 nm/RIU (refractive index unit) and relatively high quality factor of 3062. Hence, it shows that the hybrid plasmonic microcavity has potential applications in ultra-compact refractive index sensor.