Lab-on-Fiber Plasmonic Probes for Ultrasound Detection: A Comparative Study

被引：16

作者：

Giaquinto, Martino ^{[1
]}

Ricciardi, Armando ^{[1
]}

Cutolo, Antonello ^{[1
]}

Cusano, Andrea ^{[1
]}

机构：

[1] Univ Sannio, Dept Engn, Optoelect Div, I-82100 Benevento, Italy

来源：

JOURNAL OF LIGHTWAVE TECHNOLOGY | 2016年 / 34卷 / 22期

关键词：

Acoustic transducers; gratings; nanostructured materials; optical fiber sensors; periodic structures; plasmons; POLYMER-FILM; TRANSDUCER; NANOPROBES; SENSORS;

D O I：

10.1109/JLT.2016.2605039

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper deals with a numerical study on Labon-Fiber devices for acoustic (ultrasound) sensing applications. Specifically, four different configurations based on hybrid metallo-dielectric nanostructures-with sub-wavelength dimensions-supporting plasmonic modes are analyzed. A comparison in terms of spectral features and electric field distributions at resonant wavelengths is carried out. For each configuration, sensitivity is evaluated as the reflectivity intensity changes as function of dielectric slab thickness, in the range of a few hundreds of nanometers. We demonstrate that sensitivity can be maximized by exploiting the interplay between different plasmonic modes. The influence of the acousto-optic coefficient is also evaluated. In the plasmonic interaction regime, we find that the acousto-optic effect also contributes to improve the sensitivity performances. Overall, in comparison with Fabry-Perot cavity-based transducers made from same materials and with comparable dimensions, sensitivity enhancement factors of about 3 can be obtained.

引用

页码：5189 / 5198

页数：10

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