Plasmon Dephasing in Gold Nanorods Studied Using Single-Nanoparticle Interferometric Nonlinear Optical Microscopy
| Autor: | Kyoungweon Park, Kenneth L. Knappenberger, Jeremy W. Jarrett, Richard A. Vaia, Jeffrey S. Johnson, Tian Zhao |
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| Rok vydání: | 2016 |
| Předmět: |
Photoluminescence
Chemistry Dephasing Surface plasmon Analytical chemistry Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Nanorod Physical and Theoretical Chemistry Surface plasmon resonance 0210 nano-technology Spectroscopy Plasmon |
| Zdroj: | The Journal of Physical Chemistry C. 120:4071-4079 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | We report the polarization-dependent and time-resolved photoluminescence (PL) properties of gold nanorods (AuNRs). AuNRs corresponding to three different length-to-diameter aspect ratios (AR)—1.86, 2.91, and 3.90—were examined using single-nanorod spectroscopy and imaging; the nanorod volume was approximately constant over the three sample types. For each AuNR, an aspect ratio-independent transverse plasmon resonance (TSPR) was detected at 2.41 eV. Aspect-ratio-dependent longitudinal surface plasmon resonances (LSPRs) were observed at 2.08 ± 0.19 eV, 1.76 ± 0.12 eV, and 1.53 ± 0.15 eV for the 1.86-AR, 2.91-AR, and 3.90-AR samples, respectively. On the basis of both excitation and emission polarization-resolved two-photon photoluminescence (TPPL) measurements, AuNR PL emission proceeded by plasmon-mediated radiative electron–hole recombination. The resonant LSPR mode frequencies of the nanorods were determined from interferometrically detected TPPL signals. For these measurements, the interpulse time delay... |
| Databáze: | OpenAIRE |
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