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Nanotechnology Spotlight

Behind the buzz and beyond the hype:
Our Nanowerk-exclusive feature articles

Showing Spotlights 81 - 85 of 85 in category Microscopy, Spectroscopy, Imaging (newest first):

 

Infrared imaging of sub-10 nm particles

Objects a thousand times smaller than the wavelength of infrared light (10 micrometers) are undetectable by standard far-field optical infrared microscopy since the weak nanoparticle signals would be buried far below the background level. To overcome this drawback and to achieve nanoscale spatial resolution researchers in Germany illuminate the nanoparticles by a highly intensive nanoscale infrared light spot. It is generated in the nano-gap between a laser-illuminated scanning metal tip and the substrate supporting the particles. The simple but very efficient trick finally allowing detection of sub-10 nm particles is the use of highly reflecting substrates instead of glass slides typically used as a sample carrier in optical microscopy.

Posted: Aug 28th, 2006

Vibrational in situ analysis of individual molecules

Single molecule Raman spectroscopy of molecules on metal surfaces was achieved by means of optical field-enhancement from a scanning probe tip. This was made possible by the optical antenna configuration formed by optical coupling between metallic tip and the substrate.

Posted: Jun 16th, 2006