Influence of ultrathin chromium adhesion layer on different metal thicknesses of SPR-based sensor using FDTD

Najmiah Radiah Mohamad, Gan Siew Mei, Nur Akmar Jamil, Burhanuddinyeop Majlis, P. Susthitha Menon

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

Chromium (Cr) layer with ultrathin thickness plays significant role as adhesion layer to attach the prism with various metallic materials in a Surface Plasmon Resonance (SPR) sensor. In this research, the presence of fixed 0.5nm Cr adhesion layer has been investigated to evaluate its influence to reflectivity, resonance angle (θRes) and full-width at half maximum (FWHM) for different thickness of Gold (Au), Silver (Ag) and Copper (Cu) in the range of 20-60nm using finite-difference-time domain (FDTD) analysis. The results show the intensity of the maximum reflectivity (Rmax) decreased to 3-5% and the minimum reflection intensity (Rmin) changed from 2-14% depending on the thickness of the metallic layer. The lowest Rmin for each metals contributed by the presence of Cr adhesion layer was 6.06% 40nm Au, 11.7% 30nm Ag and 0.26% 40nm Cu. However, the resonance angle is almost same for all metals without influenced by the presence of ultrathin Cr adhesion layer. The optimum thickness of 50nm Au shows the same and highest sensitivity by 80.56oRIU for structure I and II. The FWHM increased when Cr adhesion layer exist and broadens the SPR curve. Therefore, the ultra-thin chromium layer has influenced the performance of the SPR sensor and highly dependent on the thickness of the metal.

Original languageEnglish
Pages (from-to)732-737
Number of pages6
JournalMaterials Today: Proceedings
Volume7
DOIs
Publication statusPublished - 1 Jan 2019
Event2018 Nanotech Malaysia - Kuala Lumpur, Malaysia
Duration: 7 May 20189 May 2018

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Surface plasmon resonance
Chromium
Adhesion
Metals
Sensors
Full width at half maximum
Time domain analysis
Prisms
Silver
Gold
Copper

Keywords

  • Copper
  • FHWM
  • Gold
  • Kretschmann
  • Optical sensor
  • Sensitivity
  • Silver
  • SPR
  • Thin film

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Influence of ultrathin chromium adhesion layer on different metal thicknesses of SPR-based sensor using FDTD. / Mohamad, Najmiah Radiah; Mei, Gan Siew; Jamil, Nur Akmar; Majlis, Burhanuddinyeop; Menon, P. Susthitha.

In: Materials Today: Proceedings, Vol. 7, 01.01.2019, p. 732-737.

Research output: Contribution to journalConference article

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abstract = "Chromium (Cr) layer with ultrathin thickness plays significant role as adhesion layer to attach the prism with various metallic materials in a Surface Plasmon Resonance (SPR) sensor. In this research, the presence of fixed 0.5nm Cr adhesion layer has been investigated to evaluate its influence to reflectivity, resonance angle (θRes) and full-width at half maximum (FWHM) for different thickness of Gold (Au), Silver (Ag) and Copper (Cu) in the range of 20-60nm using finite-difference-time domain (FDTD) analysis. The results show the intensity of the maximum reflectivity (Rmax) decreased to 3-5{\%} and the minimum reflection intensity (Rmin) changed from 2-14{\%} depending on the thickness of the metallic layer. The lowest Rmin for each metals contributed by the presence of Cr adhesion layer was 6.06{\%} 40nm Au, 11.7{\%} 30nm Ag and 0.26{\%} 40nm Cu. However, the resonance angle is almost same for all metals without influenced by the presence of ultrathin Cr adhesion layer. The optimum thickness of 50nm Au shows the same and highest sensitivity by 80.56oRIU for structure I and II. The FWHM increased when Cr adhesion layer exist and broadens the SPR curve. Therefore, the ultra-thin chromium layer has influenced the performance of the SPR sensor and highly dependent on the thickness of the metal.",
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