Abstract
This chapter reviews the characteristics of localized surface plasmon resonance (LSPR), the excitation of which is mediated by nanostructures, and its applications to biosensing. The LSPR is explored in three regimes in terms of creation and coupling of localized surface plasmons (LSPs): LSPs created in surface-relief patterns coupled to propagating surface plasmons (SPs), LSPs in surface-relief patterns coupled to particle plasmons, and LSPs created in particles. The results, in general, suggest that localized field enhancement in the near-field be correlated with enhanced detection sensitivity for LSPR over conventional thin film-based SP resonance while LSPR-based biosensors can potentially maintain flexibility by using nanoparticles.
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Abbreviations
- CCD:
-
Charge coupled device
- DNA:
-
Deoxyribonucleic acid
- EMT:
-
Effective medium theory
- FOM:
-
Figure of merit
- HDT:
-
1,6-hexanedithiol
- LSP:
-
Localized surface plasmon
- LSPR:
-
Localized surface plasmon resonance
- SAM:
-
Self-assembled monolayer
- SEF:
-
Sensitivity enhancement factor
- SP:
-
Surface plasmon
- SPR:
-
Surface plasmon resonance
- VF:
-
Volume fraction
- c :
-
Free-space light speed
- d f :
-
Film thickness
- d NW :
-
Nanowire thickness
- d SAM :
-
Thickness of a self-assembled monolayer
- e :
-
Electron charge
- f :
-
Fill factor
- k 0 :
-
Free-space light wave vector
- k SP :
-
Plasmon momentum
- m :
-
Electron mass
- n e :
-
Electron number density
- n env :
-
Ambient refractive index
- n SAM :
-
Refractive index of a self-assembled monolayer
- R min :
-
Minimum reflectance at resonance
- S :
-
Slope of the resonance angle or resonance wavelength
- T max :
-
Maximum transmittance at resonance
- ω :
-
Light angular frequency
- w NW :
-
Nanowire width
- w p :
-
Plasma angular frequency
- ε d :
-
Dielectric permittivity
- ε eff :
-
Effective permittivity
- ε m :
-
Metal permittivity
- ε np :
-
Nanoparticle permittivity
- ε A (ε B):
-
Permittivity of material A (B)
- ε 0,TE :
-
Zeroth-order effective permittivity for TE polarization
- ε 0,TM :
-
Zeroth-order effective permittivity for TM polarization
- θ SP :
-
Plasmon resonance angle
- θ LSP :
-
Localized plasmon resonance angle
- Λ :
-
Period
- λ :
-
Light wavelength
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Acknowledgments
The author thanks Dr. Kyung Min Byun and Soon Joon Yoon for proof-reading the manuscript and appreciates Dr. Eunji Sim for insightful discussion.
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Kim, D. (2010). Nanostructure-Based Localized Surface Plasmon Resonance Biosensors. In: Zourob, M., Lakhtakia, A. (eds) Optical Guided-wave Chemical and Biosensors I. Springer Series on Chemical Sensors and Biosensors, vol 7. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-88242-8_7
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DOI: https://doi.org/10.1007/978-3-540-88242-8_7
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