Sculptured-thin-film spectral holes for optical sensing of fluids

Akhlesh Lakhtakia, Martin W. McCall, Joseph A. Sherwin, Qi Hong Wu, Ian J. Hodgkinson

Research output: Contribution to journalArticle

81 Citations (Scopus)

Abstract

A novel class of fluid sensors is proposed based on monitoring the optical properties of multi-section chiral sculptured thin films (STFs) that function as spectral reflection holes. Using a nominal model that treats a chiral STF as a two-phase composite material with locally biaxial dielectric properties, we predict that the presence of a fluid in the porous film results in a red-shift of the spectral holes. Several device operation modes are proposed, and their relative merits are compared. Proof-of-concept experiments with both circularly polarized and unpolarized incident light confirm the red-shift of the spectral holes, and demonstrate operation in a practical situation.

Original languageEnglish (US)
Pages (from-to)33-46
Number of pages14
JournalOptics Communications
Volume194
Issue number1-3
DOIs
StatePublished - Jul 1 2001

Fingerprint

Thin films
red shift
Fluids
fluids
thin films
Dielectric properties
Optical properties
dielectric properties
Monitoring
Sensors
Composite materials
optical properties
composite materials
Experiments
sensors

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

Lakhtakia, Akhlesh ; McCall, Martin W. ; Sherwin, Joseph A. ; Wu, Qi Hong ; Hodgkinson, Ian J. / Sculptured-thin-film spectral holes for optical sensing of fluids. In: Optics Communications. 2001 ; Vol. 194, No. 1-3. pp. 33-46.
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Sculptured-thin-film spectral holes for optical sensing of fluids. / Lakhtakia, Akhlesh; McCall, Martin W.; Sherwin, Joseph A.; Wu, Qi Hong; Hodgkinson, Ian J.

In: Optics Communications, Vol. 194, No. 1-3, 01.07.2001, p. 33-46.

Research output: Contribution to journalArticle

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