Near-field Raman microscopy

Near-field Raman Microscopy Has Its Origins in Two Near-field

The origin of Raman spectroscopy dates back to the early 20th century. Theoretical predictions1 postulated that photons should inelastically scatter from molecules in analogy to the Compton scattering of X-rays. In 1928, Raman and Krishnan2 provided the first experimental evidence for such scattering events. Targeting a solution of chloroform with a beam of spectrally filtered sunlight, they de...

Scanning near-field optical microscopy.

An average human eye can see details down to 0,07 mm in size. The ability to see smaller details of the matter is correlated with the development of the science and the comprehension of the nature. Today's science needs eyes for the nano-world. Examples are easily found in biology and medical sciences. There is a great need to determine shape, size, chemical composition, molecular structure and...

Towards terahertz near-field microscopy.

We have detected sub-wavelength spot sizes in the near-field of a metal tip, which is illuminated with terahertz (THz) pulses. The THz near-field is detected by using electro-optic detection in a (100) oriented GaP crystal. Contrary to conventional electro-optic detection, which uses (110) oriented detection crystals, (100) crystals only allow the detection of THz light, polarized perpendicular...

Near-field Raman spectroscopy of nanocarbon materials.

Nanocarbon materials, including sp(2) hybridized two-dimensional graphene and one-dimensional carbon nanotubes, and sp(1) hybridized one-dimensional carbyne, are being considered for the next generation of integrated optoelectronic devices. The strong electron-phonon coupling present in these nanocarbon materials makes Raman spectroscopy an ideal tool to study and characterize the material and ...

Scanning Near-field Raman Spectroscopic Microscope