, Volume 13, Issue 6, pp 1995–2000 | Cite as

Design Analysis of Refractive Index Sensor with High Quality Factor Using Au-Al2O3 Grating on Aluminum

  • Ashish BijalwanEmail author
  • Vipul Rastogi


We propose a surface plasmon resonance (SPR)-based refractive index sensor using gold-alumina grating over aluminum film for biosensing. Conventional SPR sensor based on gold grating exhibits broader SPR dips whereas that based on aluminum grating exhibits narrow reflection dip. A narrow reflection dip is desirable as it provides good resolution and improves the accuracy of measurement. Aluminum is less stable and generally is not preferred for an SPR-based sensor. It is more prone to being oxidized, which reduces the sensitivity and increases the width of the reflection dip of the sensor. While gold cannot provide narrow SPR reflection dips, but is used as an SPR active metal due to its more chemical stability. In order to improve the accuracy of gold grating-based sensor while taking care of oxidation problem of aluminum, in this paper, we propose a gold grating over aluminum film for SPR-based sensor and show that this configuration improves the sensitivity and the detection accuracy of the conventional sensor. Moreover, the oxidation problem is reduced to some extent as a part of aluminum is covered with gold. In order to completely avoid the oxidation of aluminum, we further propose to cover the exposed part of the aluminum with alumina and show that this configuration further improves the accuracy by reducing the width of the SPR reflection dip without affecting the sensitivity significantly. Numerical simulations show that sensitivity of proposed sensor is 270.33°/RIU with quality factor of more than 267.65 RIU−1.


Surface plasmon resonance Bimetallic grating SPR sensors Grating coupling 


  1. 1.
    Maier SA (2007) Plasmonics: fundamentals and applications. Springer, New YorkCrossRefGoogle Scholar
  2. 2.
    Liedberg B, Nylander C, Lundstrom I (1983) Surface plasmons resonance for gas detection and biosensing. Sens. Actuators 4:299–304CrossRefGoogle Scholar
  3. 3.
    Kretschmann E, Raether H (1968) Radiative decay of nonradiative surface plasmons excited by light. Z Naturforsch 23:2135–2136Google Scholar
  4. 4.
    Fano U (1941) The theory of anomalous diffraction gratings and of quasi-stationary waves on metallic surfaces (Sommerfeld’s waves). J Opt Soc Am 31:213–222CrossRefGoogle Scholar
  5. 5.
    Hutley MC, Maystre D (1976) The total absorption of light by a diffraction grating. Opt Commun 19:431–436CrossRefGoogle Scholar
  6. 6.
    Homola J, Yee SS, Gauglitz G (1999) Surface plasmon resonance sensors: review. Sens Actuators B: Chem 54:3–15CrossRefGoogle Scholar
  7. 7.
    Roh S, Chung T, Lee B (2011) Overview of the characteristics of micro- and nano-structured surface plasmon resonance sensors. Sensors 11:1565–1588CrossRefPubMedGoogle Scholar
  8. 8.
    Takeuchi H, Thongborisute J, Matsui Y, Sugihara H, Yamamoto H, Kawashima Y (2005) Novel mucoadhesion tests for polymers and polymer-coated particles to design optimal mucoadhesive drug delivery systems. Adv Drug Deliv Rev 57:1583–1594CrossRefPubMedGoogle Scholar
  9. 9.
    Pyayt AL, Wiley B, Xia Y, Chen A, Dalton L (2008) Integration of photonic and silver nanowire plasmonic waveguides. Nature nanotech 3:660–665CrossRefGoogle Scholar
  10. 10.
    Guo J, Keathley PD, Hastings JT (2008) Dual-mode surface-plasmon-resonance sensors using angular interrogation. Opt Lett 33:512–514CrossRefPubMedGoogle Scholar
  11. 11.
    Byun KM, Kim SJ, Kim D (2007) Grating-coupled transmission-type surface plasmon resonance sensors based on dielectric and metallic gratings. Appl Opt 46:5703–5708CrossRefPubMedGoogle Scholar
  12. 12.
    Lin K, Lu Y, Chen J, Zheng R, Wang P, Ming H (2008) Surface plasmon resonance hydrogen sensor based on metallic grating with high sensitivity. Opt Express 16:18599–18604CrossRefPubMedGoogle Scholar
  13. 13.
    Wu F, Liu L, Feng L, Xu D, Lu N (2015) Improving the sensing performance of double gold gratings by oblique incident light. Nano 7:13026–13032Google Scholar
  14. 14.
    Dhibi A, Khemiri M, Oumezzine M (2016) Theoretical study of surface plasmon resonance sensors based on 2D bimetallic alloy grating. Phot Nano Fund Appl 22:1–8CrossRefGoogle Scholar
  15. 15.
    Cai D, Lu Y, Lin K, Wang P, Ming H (2008) Improving sensitivity of SPR sensor based on grating by double-dips method (DDM). Opt Express 16:14597–14602CrossRefPubMedGoogle Scholar
  16. 16.
    Sharma AK, Gupta BD (2007) On the performance of different bimetallic combinations in surface plasmon resonance based fiber optic sensors. J Appl Phys 101:093111–0931116CrossRefGoogle Scholar
  17. 17.
    Jha R, Sharma AK (2009) High-performance sensor based on surface plasmon resonance with chalcogenide prism and aluminum for detection in infrared. Opt Lett 34:749–751CrossRefPubMedGoogle Scholar
  18. 18.
    Hu C, Liu D (2010) High-performance grating coupled surface plasmon resonance sensor based on Al-Au bimetallic layer. Mod Appl Sci 4:8–13Google Scholar
  19. 19.
    Su W, Zheng G, Li X (2012) Design of a highly sensitive surface plasmon resonance sensor using aluminum-based diffraction grating. Opt Commun 285:4603–4607CrossRefGoogle Scholar
  20. 20.
    Bijalwan A, Rastogi V (2017) Sensitivity enhancement of a conventional gold grating assisted surface plasmon resonance sensor by using a bimetallic configuration. Appl Opt 56:9606–9612CrossRefPubMedGoogle Scholar
  21. 21.
    Moharam MG, Grann EB, Pommet DA, Gaylord TK (1995) Formulation for stable and efficient implementation of the rigorous coupled-wave analysis of binary gratings. J Opt Soc Am A 12:1068–1076CrossRefGoogle Scholar
  22. 22.
    Lee W, Degertekin FL (2004) Rigorous coupled-wave analysis of multilayered grating structures. J Lightwave Technol 22:2359–2363CrossRefGoogle Scholar
  23. 23.
    Yuk JS, Guignon EF, Lynes MA (2014) Sensitivity enhancement of a grating-based surface plasmon-coupled emission (SPCE) biosensor chip using gold thickness. Chem Phys Lett 591:5–9CrossRefPubMedPubMedCentralGoogle Scholar
  24. 24.
    Hass G (1949) On the preparation of hard oxide films with precisely controlled thickness on evaporated aluminum mirrors. J Opt Soc Am 39:532–540CrossRefGoogle Scholar

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© Springer Science+Business Media, LLC, part of Springer Nature 2018
corrected publication April/2018

Authors and Affiliations

  1. 1.Department of PhysicsIndian Institute of Technology RoorkeeRoorkeeIndia

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