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Tip-enhanced Raman spectroscopy
Tip-enhanced Raman spectroscopy is a specialist approach to surface-enhanced Raman spectroscopy (SERS) in which enhancement of Raman scattering occurs only at the point of a near atomically sharp pin, typically coated with gold.
The maximum resolution achievable using an optical microscope, including Raman microscopes, is limited by the Abbe limit, which is approximately half the wavelength of the incident light. Furthermore with SERS spectroscopy the signal obtained is the sum of a relatively large number of molecules. TERS overcomes these limitations as the Raman spectrum obtained originates primarily from the molecules within a few tens of nanometers of the tip.
== History ==
The earliest reports of tip enhanced Raman spectroscopy typically used a Raman microscope coupled with an atomic force microscope. Tip-enhanced Raman spectroscopy coupled with a scanning tunneling microscope (STM-TERS) has also become a reliable technique, since it utilizes the gap mode plasmon between the metallic probe and the metallic substrate.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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