Volume 9, Issue 3 (lasers in medicine 2012)
lmj 2012, 9(3): 37-41 |
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Ultrasensitive biological nanosensor based on surface plasmon resonance in near-infrared range. lmj 2012; 9 (3) :37-41
URL: http://icml.ir/article-1-265-en.html
URL: http://icml.ir/article-1-265-en.html
Abstract: (10727 Views)
Background: Due to the unique tunable properties of silver nanoparticles, a biological sensor can be designed and fabricated. In this paper, a two layered silver nanoshell is used as a biological sensor based on surface plasmon resonance.
Material and Methods: As the silver nanoshell is subjected to an external uniform electric field, strong plasmon interaction between the silver shell and inner cavity leads to the intense absorption spectrum in the range of 400-1400 nm. The absorption spectrum has one peak at the plasmon resonance which is sensitive to the refractive index of surrounding medium.
Conclusion: For a two layered nanoshell with fixed radius, when the radius of inner dielectric core increases, plasmon resonance wavelength shifts toward the near-infrared range. Results show that a silver nanosensor can be optimized by choosing appropriate geometrical dimensions. At last, the sensitivity of nanosensor is calculated
Material and Methods: As the silver nanoshell is subjected to an external uniform electric field, strong plasmon interaction between the silver shell and inner cavity leads to the intense absorption spectrum in the range of 400-1400 nm. The absorption spectrum has one peak at the plasmon resonance which is sensitive to the refractive index of surrounding medium.
Conclusion: For a two layered nanoshell with fixed radius, when the radius of inner dielectric core increases, plasmon resonance wavelength shifts toward the near-infrared range. Results show that a silver nanosensor can be optimized by choosing appropriate geometrical dimensions. At last, the sensitivity of nanosensor is calculated
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