Frequency comb SFG: A new approach to multiplex detection

Patrick M. Kearns, Zahra Sohrabpour, Aaron M. Massari

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Determination of molecular orientation at interfaces by vibrational sum frequency generation spectroscopy (VSFG) requires measurements using at least two different polarization combinations of the incoming visible, IR, and generated SFG beams. We present a new method for the simultaneous collection of different VSFG polarization outputs by use of a modified 4f pulseshaper to create a simple frequency comb. Via the frequency comb, two visible pulses are separated spectrally but aligned in space and time to interact at the sample with mixed polarization IR light. This produces two different VSFG outputs that are separated by their frequencies at the monochromator rather than their polarizations. Spectra were collected from organic thin films with different polarization combinations to show the reliability of the method. The results show that the optical arrangement is immune to fluctuations in laser power, beam pointing, and IR spectral shape.

Original languageEnglish (US)
Pages (from-to)19863-19870
Number of pages8
JournalOptics Express
Issue number17
StatePublished - Aug 22 2016

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©2016 Optical Society of America.


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