A Simple and High-performance Platform for Refractive Index Sensing based on Plasmonic Metal Disks on a Metal Mirror

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  • Xianchao Liu, University of Electronic Science and Technology of China
  • ,
  • Rui Ma, Beijing University of Posts and Telecommunications
  • ,
  • Duncan Sutherland
  • Jun Wang, University of Electronic Science and Technology of China

Numerical simulations are used to study light interactions with a platform composed of arrays of stacked metal and spacer dielectric disks on a continuous Au film. Tunable and high absorption is obtained near 1.6 μm by adjusting the thickness of the dielectric disks. Nearly perfect-absorption remains for a wide range of disk diameters. The near-perfect absorption is attributed to a magnetic resonance within the dielectric disks (combined with electric resonance at the metal disks) inducing the platform response to incident light. In addition, the resonance response to environment is more sensitive than that of metal disks on dielectric/metal films. Furthermore, when the diameter of the dielectric disks is reduced, the local electromagnetic field is more exposed and the refractive index sensitivity (RIS) increases to 1133nm/RIU (refractive index unit). The method is simple and effective to improve RIS of sandwich plasmonic structures and will be adopted in various plasmonic devices.

Original languageEnglish
Article number012030
JournalIOP Conference Series: Materials Science and Engineering
Volume484
Issue1
ISSN1757-8981
DOIs
Publication statusPublished - Mar 2019
Event2018 5th Annual International Conference on Material Engineering and Application, ICMEA 2018 - Wuhan, China
Duration: 14 Dec 201816 Dec 2018

Conference

Conference2018 5th Annual International Conference on Material Engineering and Application, ICMEA 2018
CountryChina
CityWuhan
Period14/12/201816/12/2018

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