Time-resolved brewster angle microscopy for photochemical and photothermal studies on thin-films and monolayers

Jonathan Hobley, Tomoya Oori, Sergey Gorelik, Shinji Kajimoto, Hiroshi Fukumura, Dirk Honig

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Transient events in thin films and interfaces have been studied using the technique of time resolved pump-probe nanosecond Brewster angle microscopy. For p-polarized light there is a minimum reflectivity at the Brewster angle. When the interface is viewed with light that is both incident and reflected at the Brewster angle the resulting image is dark. Subsequent small changes is refractive index will then cause an increase in the reflectivity in affected regions providing high contrast images of an altered interface with a dark background level. This is the basis of Brewster angle microscopy. In the present work two synchronized nanosecond pulsed lasers were used in the pump-probe configuration in order to induce changes at an air-liquid interface and to monitor the resulting morphology changes over a range of time delays from nanosecond to milliseconds after laser-excitation. This method can be used to observe morphological changes in phase altering thin-films and molecular monolayers. Further it can be used to obtain information about transient photochemistry even in optically thin materials and nano-films. In the current work the method is used to monitor laser induced processes in phase separating binary liquid mixtures as well as in monolayers of photo-responsive amphiphilic molecules derived from spiropyran on water. The two systems are quite different but provide valuable comparisons.

Original languageEnglish
Pages (from-to)59-68
Number of pages10
JournalJournal of Nanoscience and Nanotechnology
Volume9
Issue number1
DOIs
Publication statusPublished - 2009 Jan

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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