Technique for determining the angular orientation of molecules bound to the surface of an arbitrary planar optical waveguide

Sergio B. Mendes, John Thomas Bradshaw, Steven S Saavedra

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

A technique to determine the angular orientation of a molecular assembly bound to the surface of a planar optical waveguide of arbitrary structure is described. The approach is based on measuring the absorption dichroic ratio by using the waveguide evanescent fields with orthogonal polarizations (TE, TM) and the same mode order to probe two molecular assemblies, (i) a reference sample composed of an isotropic orientation distribution of dipoles and (ii) a sample of interest. The isotropic sample is used to characterize the waveguide structure, which then allows the orientation parameters of a molecular assembly under investigation to be determined from a measured dichroic ratio. The method developed here is particularly important for applications in gradient-index and multilayer planar waveguide platforms because in those cases the extension of previously reported approaches would require a full experimental characterization of the guiding structure, which would be problematic and may yield inaccurate results.

Original languageEnglish (US)
Pages (from-to)70-78
Number of pages9
JournalApplied Optics
Volume43
Issue number1
DOIs
StatePublished - Jan 1 2004

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Planar waveguides
Optical waveguides
optical waveguides
waveguides
Molecules
Waveguides
assembly
Evanescent fields
molecules
assemblies
Multilayers
platforms
Polarization
dipoles
gradients
probes
polarization

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Technique for determining the angular orientation of molecules bound to the surface of an arbitrary planar optical waveguide. / Mendes, Sergio B.; Bradshaw, John Thomas; Saavedra, Steven S.

In: Applied Optics, Vol. 43, No. 1, 01.01.2004, p. 70-78.

Research output: Contribution to journalArticle

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