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Hashemi M, Bavarsadiankhah M J, Ebnali-heidari M, Ebnali-heidari A A. LSPR Biosensor Using a Dumbbell-Form Plasmonic Nanostructure. ICOP & ICPET _ INPC _ ICOFS 2018; 24 :329-332
URL: http://opsi.ir/article-1-1510-en.html
URL: http://opsi.ir/article-1-1510-en.html
Mahboobeh Hashemi * 
1, Mohammad Javad Bavarsadiankhah1 , Majid Ebnali-heidari1 , Ali Akbar Ebnali-heidari2
1, Mohammad Javad Bavarsadiankhah1 , Majid Ebnali-heidari1 , Ali Akbar Ebnali-heidari2
1- University of Shahrekord,
2- Farhangian University
2- Farhangian University
Abstract: (2440 Views)
In this paper, design of biosensor structure based on localized surface plasmon (LSPR) of plasmonic nanostructures is presented. Change in refrective index at boundary of metal-dielectric lead to a shift in resonance peak of LSPR structures. Plasmonic nanostructurs are very sensitive to changes of surrounding environment. Increasing refractive index of surrounding environment cause a red shift in LSPR spectrum of these structures. Thus with this feature we can distinguish absorption or connection of molecules to the surface without prelabeling (Label Free). In this article we introduced a new dumbbell shape nanoparticle and its ability in biosensing is investigated. Numerical simulations show that a high sensitivity of 1323nm/RIU for refractive index changes of surrounding the suspended gold nanostructure with a figure of merit (FOM) of 5.6.
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