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SUMMARY:Tip-Enhanced Infrared Nanospectroscopy via Molecular Expansion For
 ce Detection
DTSTART:20140115T141500
DTSTAMP:20260510T084039Z
UID:d78d0c29b567d10b66b395af4642537bd31db1e34dc2e32f6383ed91
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Mikhail Belkin\, University of Texas\, Austin\, TX (USA)
 \nBio: Dr. Belkin received PhD in Physics in from the University of Califo
 rnia at Berkeley in 2004. In 2004-2008 he did his postdoctoral work in Pro
 f. Federico Capasso group in the School of Engineering and Applied Science
 s. In Fall 2008\, he joined the faculty of the Electrical and Computer Eng
 ineering Department of the University of Texas at Austin. His research int
 erests include investigating and utilizing giant nonlinear optical respons
 es in metamaterials\, quantum cascade lasers\, and other engineered and/or
  low-dimensional structures\, sub-wavelength resolution microscopy in mid-
  and far-infrared\, THz radiation sources\, and plasmonic devices.\nDr. Be
 lkin’s recent awards include the NSF CAREER Award\, the DARPA Young Facu
 lty Award\, the AFOSR Young Investigator Award\, and the Norman Hackerman 
 Advanced Research Program Award for Early Career Investigators from the st
 ate of Texas. He has authored or co-authored over 100 journal and conferen
 ce papers.\nFor more details\, please visit webpage at UT Austin.\nJOINT B
 IO- and ELECTRICAL ENGINEERING SEMINAR\nMid-infrared absorption spectrosco
 py in the molecular fingerprint region is widely used for chemical identif
 ication and quantitative analysis employing infrared absorption spectra da
 tabases. The ability to perform mid-infrared spectroscopy with nanometer s
 patial resolution is highly desired for applications in materials and life
  sciences. Currently\, scattering near-field scanning optical microscopy (
 s-NSOM) is considered to be the most sensitive technique for nanoscale mid
 -infrared spectroscopy in ambient conditions. Here I will demonstrate that
  mid-infrared spectra can be obtained with comparable or higher sensitivit
 y and spatial resolution by detecting mechanical forces exerted by molecul
 es on the atomic force microscope tip upon light excitation. The mechanica
 l approach to nanospectroscopy results in a simple optical setup which\, u
 nlike s-NSOM\, is not affected by sample scattering\, has no cryogenically
 -cooled mid-infrared detectors\, and is easy to align. We demonstrate imag
 ing and spectroscopy of molecular monolayer islands and estimate that only
  approximately 300 molecules contribute to cantilever deflection in our ex
 periments.\nI will also discuss our preliminary results aimed to extend th
 is technique operation to aqueous environments and into the terahertz spec
 tral range. Perspectives towards in-situ infrared spectroscopy with single
 -molecule sensitivity will be also discussed.
LOCATION:SV1717A http://map.epfl.ch/?room=sv1717a
STATUS:CONFIRMED
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