2010 IR Workshop

Larry Carr

[Click here for the abstract]


Larry is a Physicist and group leader for Low-Energy Spectroscopy in the Photon Sciences Directorate at Brookhaven National Laboratory where he manages the U4IR and U12IR infrared beamlines on the NSLS VUV/IR electron storage ring.  Prior to joining BNL, he held positions in both academia (Emory Univ.) and industry (Northrop Grumman Research Ctr.). 

His research activities focus on instrumenation developments for use with infrared synchrotron radiation and the study of electron dynamics in superconductors and semiconductors by pump-probe spectroscopy methods.  He has been involved with infrared microspectroscopy since the mid 1990s and focal plane array based microscopy for the past few years.


FPA-Based Infrared Microspectroscopic Imaging at the NSLS

G.L. Carr1 , R.J. Smith1 , A. Acerbo2  and L.M. Miller1,2

1National Synchrotron Light Source, Brookhaven National Laboratory, Upton NY
2Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY

The infrared microspectrometer equipped with a focal-plane-array (FPA) detector represents a major advance in the chemical imaging of heterogeneous materials.  An important step was the development of the HgCdTe (MCT) photodiode array that can be incorporated into a microscope system and also read out at the kHz rates needed to function with high performance, rapid scan FTIR spectrometers.  When combined with the high brightness synchrotron source, the array can be configured to spatially over-sample a region such that image processing methods can be employed to improve resolution and contrast.  Still, the performance of an individual pixel for these 2D array detectors lags that for the single element detector, both in noise and spectral range. 

Like the IRENI beamline facility at the Wisconsin SRC, the NSLS is one of the few light sources operating a 2D focal-plane-array (FPA) infrared microspectrometer system with synchrotron radiation.  In contrast to IRENI, the NSLS microscope uses an existing infrared beamline without an optimized optical system.  As such, a portion of our research effort goes into optical methods for matching the source to the FPA.  Since the existing NSLS storage ring sources are scheduled to end operations by 2015, we are also developing plans for an FPA-based microspectroscopy beamline at NSLS-II (scheduled to begin operations in 2014).  This presentation will describe some of our current FPA instrument development activities at the NSLS and plans for NSLS-II.

Research Supported by the U.S. Dep't of Energy under contract DE-AC02-98CH10886 at the NSLS and NIH grant  S10-RR023782 at Stony Brook University.