Tip-enhanced spectroscopy
A tip-enhanced spectroscopy may include a substrate on which liquid containing an analyte is to be positioned, a tip extending from a fixed end to a free end adjacent to a location for the analyte, and a vibration source configured to harmonically vibrate the tip based on a preset natural frequency. The preset natural frequency may be a natural frequency of a tuning fork.
1 . A tip-enhanced spectroscopy device comprising:
a substrate on which liquid containing an analyte is to be positioned;
a tip extending from a fixed end to a free end adjacent to a location for the analyte; and
a vibration source configured to harmonically vibrate the tip based on a preset natural frequency such that the free end has an oscillation amplitude oriented perpendicular to a longitudinal direction of the tip;
wherein the vibration source is configured to harmonically vibrate the tip in a vibration mode having at least two nodes; and
wherein the free end has an oscillation amplitude smaller than an oscillation amplitude of the free end when the tip vibrates in a first harmonic vibration.
2 . The tip-enhanced spectroscopy device of claim 1 , wherein the tip is formed to harmonically vibrate to a third or higher order by the preset natural frequency of the vibration source.
3 . The tip-enhanced spectroscopy device of claim 1 , wherein a length of the tip is 2.5 to 3.5 mm.
4 . The tip-enhanced spectroscopy device of claim 1 , wherein the tip is a plasmonic tip formed to include one or more types selected from the group consisting of gold (Au), silver (Ag), aluminum (Al), copper (Cu), cobalt (Co), chromium (Cr), platinum (Pt), palladium (Pd), rhodium (Rh), titanium (Ti), and nickel (Ni).