Direct observation of optically forbidden energy transfer between CuCl quantum cubes via near-field optical spectroscopy
Direct observation of optically forbidden energy transfer between CuCl quantum cubes via near-field optical spectroscopy
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DOI：
10.1103/physrevlett.88.067404
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发表时间：
2002-02-11
影响因子：
8.6
通讯作者：
Ohtsu, M
中科院分区：
文献类型：
--
作者：
Kawazoe, T;Kobayashi, K;Ohtsu, M
我们首次利用超高分辨率近场光学显微镜和光谱技术，在15k的近紫外区报道了CuCl量子立方体之间近场能量转移的证据。样品采用高密度CuCl量子立方体包埋在NaCl基体中，测量了4.6 mn和6.3 nm量子立方体的发光强度的空间分布，明确了反相关特征。这被认为是一种能量从4.6 nm量子立方体中激子的最低态转移到6.3 nm量子立方体中激子的第一偶极禁止激发态的表现，这归因于共振光学近场相互作用。
We report, for the first time, evidence of near-field energy transfer among CuCl quantum cubes using an ultrahigh-resolution near-field optical microscopy and spectroscopy in the near UV region at 15 K. The sample was high-density CuCl quantum cubes embedded in a NaCl matrix, Measured spatial distributions of the luminescence intensities from 4.6-mn and 6.3-nm quantum cubes clearly established anticorrelation features. This is thought to be a manifestation of the energy transfer from the lowest state of exciton in 4.6-nm quantum cubes to the first dipole-forbidden excited state of exciton in 6.3-nm quantum cubes, which is attributed to the resonant optical near-field interaction.