Chemical imaging with scanning near-field infrared microscopy and spectroscopy

2000 ◽  
Author(s):  
Chris A. Michaels ◽  
Lee J. Richter ◽  
Richard R. Cavanagh ◽  
Stephan J. Stranick
Keyword(s):  
Near Field ◽  
Chemical Imaging ◽  
Infrared Microscopy

Chemical Imaging With a Scanning Probe Microscope

1999 ◽  
Vol 5 (S2) ◽  
pp. 970-971
Author(s):  
Dmitri A. Kossakovski ◽  
John D. Baldeschwieler ◽  
J. L. Beauchamp
Keyword(s):  
Beam Quality ◽  
Near Field ◽  
Ambient Air ◽  
Chemical Imaging ◽  
Scanning Probe ◽  
Scanning Tunneling ◽  
Visible Range ◽  
Spectrometric Analysis ◽  
Chemical Information ◽  
Near Field Scanning

Scanning Probe Microscopy (SPM) is a superb tool for topographical analysis of samples. However, traditional varieties of SPM such as Atomic Force, Scanning Tunneling and Near-field Scanning Optical Microscopy have limited chemical contrast capability. Recently, several advanced techniques have been reported which provide chemical information in addition to topographical data. All these methods derive advantage from combinations of scanning probe methodologies and some other, chemically sensitive technique. Examples of such approaches are: Near-field Scanning Raman Imaging, Near-field Scanning Infrared Microscopy and mass spectrometric analysis with laser ablation through fiber probes.In this contribution we report the development of a new method in this family of chemically sensitive scanning probe techniques: Laser Induced Breakdown Spectroscopy with Shear Force Microscopy, LIBS-SFM. Traditional LIBS experiments involve focusing a pulsed laser beam onto the sample and observing optical emission from the plasma formed in the ablation area. The emissions are mostly in the UV/visible range, and the signal is due to electronic transitions in excited atoms and ions in the plasma plume. The spectra are analyzed to identify chemical elements. The spatial resolution of LIBS is limited by the wavelength and beam quality of the laser used for ablation. The experiments may be conducted in vacuum, controlled atmosphere, or ambient air.

Scanning near-field infrared microscopy based on tapered silver–halide probes

2004 ◽  
Vol 84 (4) ◽  
pp. 637-639 ◽  
Author(s):  
P. Ephrat ◽  
K. Roodenko ◽  
L. Nagli ◽  
A. Katzir
Keyword(s):  
Near Field ◽  
Silver Halide ◽  
Infrared Microscopy

Chemical Imaging of the Surface of Self-Assembled Polystyrene-b-Poly(methyl methacrylate) Diblock Copolymer Films Using Apertureless Near-Field IR Microscopy

Langmuir ◽  
2008 ◽  
Vol 24 (13) ◽  
pp. 6946-6951 ◽  
Author(s):  
Kerstin Mueller ◽  
Xiujuan Yang ◽  
Melissa Paulite ◽  
Zahra Fakhraai ◽  
Nikhil Gunari ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Diblock Copolymer ◽  
Near Field ◽  
Chemical Imaging ◽  
Poly Methyl Methacrylate ◽  
Ir Microscopy ◽  
Copolymer Films ◽  
Self Assembled

Confocal Raman Line-Scanned Imaging of Complex Geological and Histological Thin Sections

1997 ◽  
Vol 3 (S2) ◽  
pp. 817-818
Author(s):  
Fran Adar ◽  
Roussel Bernard ◽  
Alian Wang ◽  
Shari Hawi ◽  
Kasem Nithipathikom
Keyword(s):  
Spatial Resolution ◽  
Optical Radiation ◽  
Raman Band ◽  
Near Field ◽  
Chemical Species ◽  
Chemical Imaging ◽  
Large Area ◽  
Thin Sections ◽  
Chemical Image ◽  
Better Than

Chemical imaging of complex multi-component materials has important potential for the analyst in many fields of research. Raman imaging is of particular interest for several reasons. The Raman spectra contain detailed information on chemical species and crystalline phase. Because the Raman effect is excited by optical radiation, the spatial resolution, which is proportional to the wavelength of the light, is better than 1 μm. and with near field optical techniques currently under development, there is potential for even higher spatial resolution in the chemical image.The methods used to produce an image fall into essentially two categories - global imaging and confocal mapping. When creating global images, a large area of the sample is bathed in laser light. The light scattered by the sample is filtered to select a Raman band, and then that light is used to create an image of the sample on a two-dimensional detector.

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