Quantification of transient absorption in photo-reactive monolayers using reflectometry in the vicinity of brewster angle

Sergey Gorelik, Jonathan Hobley, Martin J. Lear, Hongyan Song, Stanley Yew Siong Yong, Jianhua Cheng

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A method is presented that enables the determination of transient absorption in Langmuir films made from a monolayer of spiropyran on water. This is achievable even though the optical pathlength of such a monolayer is < 10-9 m. The approach is to monitor reflectivity changes close to the Brewster angle, where the background of reflected light is minimized. This is the key to the sensitivity of the method. Relatively speaking the small changes in reflectivity due to changes in both real and imaginary parts of the refractive index are easier to observe with the intrinsically low backgrounds at the Brewster angle. Notably using Fresnel equations we can show that the real and imaginary parts of the refractive index can be independently assessed for ultrathin films and monolayers using the approach presented.

Original languageEnglish
Pages (from-to)213-218
Number of pages6
JournalInternational Journal of Nanoscience
Volume8
Issue number1-2
DOIs
Publication statusPublished - 2009

Keywords

  • Brewster angle
  • Monolayer
  • Photochemistry
  • Reflection
  • Transient absorption

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Computer Science Applications
  • Electrical and Electronic Engineering

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