Nanopicture of the Day

www.nanopicoftheday.org

January 8, 2004

Infrared Near Field Imaging
 

Source: Gilbert Walker

      References:

Akhremitchev, B. B; Walker G. C. “Apertureless Scanning Near-Field Infrared Microscopy of Rough Polymeric Surface”, Langmuir, 2001, 17, 2774-2781.

Akhremitchev, B. B.; Sun, Y.; Stebounova, L.; Walker, G. C. “Monolayer-Sensitive Infrared Imaging of DNA Stripes Using Apertureless Near-Field Microscopy”, Langmuir, 2002, 18, 5325-5328.

 

Description:

This image shows an apertureless infrared near field microscopic image of a nanostructure polystyrene poly (dimethylsiloxane) block copolymer surface. Near field microscopy/spectroscopy uses an oscillating scanned tip (like an atomic force microscope - AFM or scanning tunneling microscope - STM) combined with laser illumination to visualize the surface.  This technique allows resolution up to 100 times better than the wavelength of the light being used.  The upper image shows the surface imaged at constant tip-surface separation. The bottom image shows the surface imaged at constant height above the substrate. PDMS appears as the small bumps in the lower image.  This technique can even be used to view individual molecules and DNA.
 

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