Plasmonics

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Giant Infrared Sensitivity of Surface Plasmon Resonance-Based Refractive Index Sensor

  • Akhilesh Kumar Mishra
  • Satyendra Kumar Mishra
  • Amar Pal Singh
Article
  • 163 Downloads

Abstract

Surface plasmons (SPs), the coherent charge density oscillations of the electrons bound to the metal-dielectric interface, are dominating the research field of optics. One of the ubiquitous applications of SPs is in sensing. In the present work, we have theoretically studied a couple of surface plasmon resonance (SPR)-based fiber-coupled ultra-sensitive refractive index sensors working in the infrared (IR) region. Either of the copper (Cu) and aluminum (Al) is used as surface plasmon exciting layers in these sensing probes. On the top of the metal layer, field-enhancing graphene and silicon layers are considered. The probes are characterized in terms of sensitivity and detection accuracy (DA). The sensitivities of Cu- and Al-based optimized probes are obtained respectively to be 23.50 and 24 μm/refractive index unit (RIU). To ensure the probes’ compatibility with bio-samples, an extra bio-recognition layer of graphene has been considered over the silicon layer which resulted into the respective sensitivities of 20 and 19.50 μm/RIU for Cu- and Al-based probes with appreciably good DAs.

Keywords

Surface plasmon Sensitivity Sensor Graphene Silicon Fiber 

Notes

Acknowledgements

Akhilesh Kumar Mishra acknowledges the support in part at Technion by Israel Council for Higher Education.

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  1. 1.Andrew and Erna Viterbi Faculty of Electrical EngineeringTechnion—Israel Institute of TechnologyHaifaIsrael
  2. 2.Electronic Engineering DepartmentCity University of Hong KongKowloon TongHong Kong
  3. 3.Faculty of BiologyTechnion—Israel Institute of TechnologyHaifaIsrael

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