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Nanostructure-Based Localized Surface Plasmon Resonance Biosensors

  • Donghyun KimEmail author
Chapter
Part of the Springer Series on Chemical Sensors and Biosensors book series (SSSENSORS, volume 7)

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.

Keywords

Nanostructures Surface plasmon resonance Localized surface plasmon resonance Bio-molecular interactions Refractive index change Effective medium Thin films Biosensors Sensitivity Nanoparticles 

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

Symbols

c

Free-space light speed

df

Film thickness

dNW

Nanowire thickness

dSAM

Thickness of a self-assembled monolayer

e

Electron charge

f

Fill factor

k0

Free-space light wave vector

kSP

Plasmon momentum

m

Electron mass

ne

Electron number density

nenv

Ambient refractive index

nSAM

Refractive index of a self-assembled monolayer

Rmin

Minimum reflectance at resonance

S

Slope of the resonance angle or resonance wavelength

Tmax

Maximum transmittance at resonance

ω

Light angular frequency

wNW

Nanowire width

wp

Plasma angular frequency

εd

Dielectric permittivity

εeff

Effective permittivity

εm

Metal permittivity

εnp

Nanoparticle permittivity

εA (εB)

Permittivity of material A (B)

ε0,TE

Zeroth-order effective permittivity for TE polarization

ε0,TM

Zeroth-order effective permittivity for TM polarization

θSP

Plasmon resonance angle

θLSP

Localized plasmon resonance angle

Λ

Period

λ

Light wavelength

Notes

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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Copyright information

© Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  1. 1.School of Electrical and Electronic EngineeringYonsei UniversitySeoulKorea

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