title: Experimental implementations of 2D IR spectroscopy through a horizontal pulse shaper design and a focal plane array detector.
abstract: Aided by advances in optical engineering, two-dimensional infrared spectroscopy (2D IR) has developed into a promising method for probing structural dynamics in biophysics and material science. We report two new advances for 2D IR spectrometers. First, we report a fully reflective and totally horizontal pulse shaper, which significantly simplifies alignment. Second, we demonstrate the applicability of mid-IR focal plane arrays (FPAs) as suitable detectors in 2D IR experiments. FPAs have more pixels than conventional linear arrays and can be used to multiplex optical detection. We simultaneously measure the spectra of a reference beam, which improves the signal-to-noise by a factor of 4; and two additional beams that are orthogonally polarized probe pulses for 2D IR anisotropy experiments.
authors.forename: Ayanjeet
authors.initials: A
authors.lastname: Ghosh
authors.forename: Arnaldo L
authors.initials: AL
authors.lastname: Serrano
authors.forename: Tracey A
authors.initials: TA
authors.lastname: Oudenhoven
authors.forename: Joshua S
authors.initials: JS
authors.lastname: Ostrander
authors.forename: Elliot C
authors.initials: EC
authors.lastname: Eklund
authors.forename: Alexander F
authors.initials: AF
authors.lastname: Blair
authors.forename: Martin T
authors.initials: MT
authors.lastname: Zanni
mesh_terms: D016880:Anisotropy; D006586:Hexanes; D055096:Optical Devices; D013055:Spectrophotometry, Infrared / Q000295:instrumentation*
chemical_list: D006586:Hexanes