Enhancing the Sensitivity of a Surface Plasmon Resonance Sensor with Glancing Angle Deposited Nanostructures

Abstract

In this paper, we demonstrate that the glancing angle deposition (GLAD) technique is a competitive and efficient method to fabricating a nanostructured surface that enhances the sensitivity of surface plasmon resonance (SPR) sensors, because of its simplicity and unique characteristics of material selection. The theoretical investigations were conducted by employing a rigorous coupled-wave analysis for design metrics, i.e., shift in resonance angle, SPR curve angular width, and minimum reflectance at resonance. An optimized geometry was achieved with enhanced characteristics of the SPR sensor. The SPR features of hybrid GLAD nanostructures deposited onto metallic thin films were investigated. An optical setup that used the Kretschmann-Reather configuration was utilized to monitor changes in the refractive index of water solution using the optical power interrogation method. The experimental results demonstrate that the SPR sensor fabricated with hybrid GLAD nanostructures of 30 nm height and ~ 12 nm inter-structural gap size achieved the sensitivity ~ 4× higher that of a than conventional SPR sensor.

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Data Availability

Data sharing is not applicable to this article as no datasets were generated or analyzed during the current study.

Abbreviations

GLAD:

glancing angle deposition

SPR:

surface plasmon resonance

RI:

refractive index

LSPR:

localized surface plasmon resonance

EBL:

e-beam lithography

RTA:

rapid thermal annealing

MEF:

metal-enhanced fluorescence

SERS:

surface-enhanced Raman spectroscopy

CAW:

curve angular width

MRR:

minimum reflectance at resonance

RCWA:

rigorous coupled wavelength analysis

SEM:

scanning electron microscopy

AFM:

atomic force microscopy

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Funding

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIP) (No. 2015R1A5A1037668) and Australian Endeavour Award (2017–2018) funded by the Australian Ministry of Education.

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Contributions

In this paper, Seok-min Kim and Kamal Almeh conceived the idea and continuously collaborated during the experimental and modeling phase. Mohsin Ali Badshah, David Michel, and Nur E Alam fabricated the prototype sample. Imtiaz Madni conducted the characterization experiments. Mohsin Ali Badshah and Naseem Abbas performed the simulations. Mohsin Ali Badshah and David Michel wrote the paper. Seok-min Kim and Kamal Alameh proofread and revised the manuscript. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Kamal Alameh or Seok-min Kim.

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Badshah, M.A., Michel, D., Alam, N.E. et al. Enhancing the Sensitivity of a Surface Plasmon Resonance Sensor with Glancing Angle Deposited Nanostructures. Plasmonics (2020). https://doi.org/10.1007/s11468-020-01245-0

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Keywords

  • Glancing angle deposition
  • Surface plasmon resonance
  • Localized surface plasmon resonance
  • Refractive index
  • Nanostructures