科研之友
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摘要
We used a confocal laser microscope to investigate the one-photon photoluminescence (PL) of gold antennas. The PL spectra can be precisely fitted to a plasmon - enhanced PL model. For increasing the antenna length, the energy peak position decreases continuously until it reaches a value of 1.7 - 1.8 eV. For longer antennas and smaller plasmon energies, we observe an additional, persistent shoulder in the PL spectra, which we explain by a Gaussian - shaped peak at Delta(X) approximate to 1.78 - 1.79 eV. We attribute this behavior to the opening of an additional decay path for electrons at the gold interband transition edge, which we observe only for long antennas.
- 出版日期2016-4-1
