High-sensitivity Stokes spectropolarimetry on cyanobacteria

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Abstract

We investigate the spectral signatures arising from the optical properties of chlorophyll in linear and circularly polarised scattered light from cyanobacteria. We include Stokes scattering coefficient measurements on two cyanobacteria species, Chroococcidiopsis and Synechococcus to a fractional polarisation of ±0.0001 across visible wavelengths. We find that the largest circularly polarised optical signatures from our cyanobacteria samples can be described by optical scattering from spheroidal objects with internal reflections and absorption and, importantly, light scattering from chiral processes is not identifiable in our narrow band light scattering data. We believe previous light scattering measurements attributing chirality effects to cyanobacteria may have been dominated by internal scattering processes.

Original languageEnglish
Pages (from-to)131-141
Number of pages11
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Volume170
Early online date3 Nov 2015
DOIs
Publication statusPublished - 1 Feb 2016

Keywords

  • Biomarkers
  • Chlorophyll red-edge
  • Circular polarisation
  • Cyanbacteria
  • Homochirality
  • Remote sensing

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