Publication Type
Journal
Journal Name
Applied Physics Letters
Publication Date
Page Number
113116
Volume
101
Issue
11
Abstract
An aluminum bow-tie nano-antenna is combined with the resonance Raman e ect in the deep ultraviolet to
dramatically increase the sensitivity of Raman spectra to a small volume of material, such as benzene used
here. We further demonstrate gradient- eld Raman peaks for several strong IR modes. We achieve a gain
of 105 in signal intensity from the near eld enhancement due to the surface plasmon resonance in the
aluminum nanostructure. The on-line resonance enhancement contributes another factor of several thousands,
limited by the laser line width. Thus, an overall gain of hundreds of million is achieved.
