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Publication

A New Approach to Vibrational Sum Frequency Generation Spectroscopy Using Near Infrared Pulse Shaping

Publication Type
Journal
Journal Name
Review of Scientific Instruments
Publication Date
Page Number
033106
Volume
90
Issue
3

We have developed a multipurpose vibrational sum frequency generation (vSFG) spectrometer that is uniquely capable of probing a broad range of chemical species, each requiring different experimental conditions, without optical realignment. Here, we take advantage of arbitrary near infrared (NIR) waveform generation using a 4f-pulse shaper equipped with a 2D spatial light modulator (SLM) to tailor upconversion pulses to meet sample dependent experimental requirements. This report details the experimental layout, details of the SLM calibration and implementation, as well as the intrinsic benefits/limitations of this new approach to vSFG spectroscopy. We have demonstrated the competency of this spectrometer by achieving an ~3-fold increase in spectral resolution compared to conventional spectrometers probing a model dimethyl sulfoxide/air interface. Using the same optical alignment, we also show the ability to suppress nonresonant background contributions at electrode interfaces using time delayed asymmetric NIR waveforms. It is expected that this instrumentation will broaden the types of samples researchers can readily approach using these surface specific spectroscopies.