Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 112, Issue 33, Pages 12721-12727Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp8032758
Keywords
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Funding
- American Chemical Society [PRF 46067-G6]
- National Science Foundation, Chemical Bonding Center [CHE-0533162]
- National Science Foundation [CHE-0641169]
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The two-photon excited luminescence (TPEL) of single gold nanowires was investigated under far-field illumination with picosecond pulses. These nanowires, having a rectangular cross-section, a precisely defined thickness, and millimeter-scale length, were prepared by using the lithographically patterned nanowire electrodepostion (LPNE) technique. The TPEL from these wires was investigated as a function of wire thickness. It is found that the optical properties of the wire are dominated by the transverse surface plasmon resonance, which enhances the two-photon absorption process and subsequent emission in the polarization direction of the plasmon mode. Upon tuning the thickness of the wire from 74 to 25 nm, an enhancement of 3 orders of magnitude in the TPEL was observed. The TPEL tunability is found to be consistent with the geometry-dependent field concentration at the metal surface as predicted by the lightning rod model.
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