Pump-probe scanning near field optical microscopy: Sub-wavelength resolution chemical imaging and ultrafast local dynamics

Khadga Karki, Mahesh Namboodiri, Tahir Zeb Khan, Arnulf Materny*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Results of two color femtosecond time-resolved pump-probe experiments using scanning near field optical microscopy on thin films of organic semiconductor 3,4,9,10 perylenetetracarboxylic dianhydride are presented. With this technique, quantitative information on exciton dynamics with high temporal and spatial resolution can be obtained by fitting a rate model to the transient absorption spectra. Additionally, the chemical selectivity inherent to this technique enhances the contrast, which could be used for video-rate imaging when high-repetition rate lasers are used.

Original languageEnglish
Article number153103
JournalApplied Physics Letters
Volume100
Issue number15
DOIs
StatePublished - 9 Apr 2012
Externally publishedYes

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