Modeling chiral sculptured thin films as platforms for surface-plasmonic- polaritonic optical sensing

Tom G. MacKay, Akhlesh Lakhtakia

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Biomimetic nanoengineered metamaterials called chiral sculptured thin films (CSTFs) are attractive platforms for optical sensing because their porosity, morphology, and optical properties can be tailored to order. Furthermore, their ability to support more than one surface-plasmon-polariton (SPP) wave at a planar interface with a metal offers functionality beyond that associated with conventional SPP-based sensors. An empirical model was constructed to describe SPP-wave propagation guided by the planar interface of a CSTF-infiltrated with a fluid which supposedly contains analytes to be detected-and a metal. The inverse Bruggeman homogenization formalism was first used to determine the nanoscale model parameters of the CSTF. These parameters then served as inputs to the forward Bruggeman homogenization formalism to determine the reference relative permittivity dyadic of the infiltrated CSTF. By solving the corresponding boundary-value problem for a modified Kretschmann configuration, the characteristics of the multiple SPP modes at the planar interface were investigated as functions of the refractive index of the fluid infiltrating the CSTF and the rise angle of the CSTF. The SPP sensitivities thereby revealed bode well for the implementation of fluid-infiltrated CSTFs as SPP-based optical sensors.

Original languageEnglish (US)
Article number5582155
Pages (from-to)273-280
Number of pages8
JournalIEEE Sensors Journal
Volume12
Issue number2
DOIs
StatePublished - Jan 1 2012

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polaritons
platforms
Thin films
thin films
homogenizing
Fluids
fluids
formalism
dyadics
biomimetics
Metamaterials
Optical sensors
Biomimetics
optical measuring instruments
Metals
boundary value problems
metals
Wave propagation
Boundary value problems
wave propagation

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Electrical and Electronic Engineering

Cite this

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abstract = "Biomimetic nanoengineered metamaterials called chiral sculptured thin films (CSTFs) are attractive platforms for optical sensing because their porosity, morphology, and optical properties can be tailored to order. Furthermore, their ability to support more than one surface-plasmon-polariton (SPP) wave at a planar interface with a metal offers functionality beyond that associated with conventional SPP-based sensors. An empirical model was constructed to describe SPP-wave propagation guided by the planar interface of a CSTF-infiltrated with a fluid which supposedly contains analytes to be detected-and a metal. The inverse Bruggeman homogenization formalism was first used to determine the nanoscale model parameters of the CSTF. These parameters then served as inputs to the forward Bruggeman homogenization formalism to determine the reference relative permittivity dyadic of the infiltrated CSTF. By solving the corresponding boundary-value problem for a modified Kretschmann configuration, the characteristics of the multiple SPP modes at the planar interface were investigated as functions of the refractive index of the fluid infiltrating the CSTF and the rise angle of the CSTF. The SPP sensitivities thereby revealed bode well for the implementation of fluid-infiltrated CSTFs as SPP-based optical sensors.",
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Modeling chiral sculptured thin films as platforms for surface-plasmonic- polaritonic optical sensing. / MacKay, Tom G.; Lakhtakia, Akhlesh.

In: IEEE Sensors Journal, Vol. 12, No. 2, 5582155, 01.01.2012, p. 273-280.

Research output: Contribution to journalArticle

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