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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Near-field manipulation of spectroscopic selection rules on the nanoscale
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Near-field manipulation of spectroscopic selection rules on the nanoscale

机译:纳米级光谱选择规则的近场操纵

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摘要

In conventional spectroscopy, transitions between electronic levels are governed by the electric dipole selection rule because electric quadrupole, magnetic dipole, and coupled electric dipole-magnetic dipole transitions are forbidden in a far field. We demonstrated that by using nanostructured electromagnetic fields, the selection rules of absorption spectroscopy could be fundamentally manipulated. We also show that forbidden transitions between discrete quantum levels in a semiconductor nanorod structure are allowed within the near-field of a noble metal nanoparticle. Atomistic simulations analyzed by an effective mass model reveal the breakdown of the dipolar selection rules where quadrupole and octupole transitions are allowed. Our demonstration could be generalized to the use of nanostructured near-fields for enhancing light-matter interactions that are typically weak or forbidden.
机译:在常规光谱学中,电子水平之间的跃迁由电偶极子选择规则控制,因为在远场中禁止电四极子,磁偶极子和耦合的电偶极子-磁偶极子跃迁。我们证明了通过使用纳米结构的电磁场,可以从根本上操纵吸收光谱的选择规则。我们还表明,在贵金属纳米粒子的近场内允许半导体纳米棒结构中离散量子能级之间的禁止跃迁。由有效质量模型分析的原子模拟揭示了偶极选择规则的细目,其中允许四极和八极跃迁。我们的演示可以推广到使用纳米结构近场来增强通常是弱的或被禁止的光物质相互作用。

著录项

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  • 作者单位

    Department of Chemistry, University of California, Berkeley, CA 94720, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, Department of Chemistry, Department of Physics, and The Beckman Institute for Advanced Science and Technology, University of Illinois, Urbana, IL 61801;

    Department of Chemistry, University of California, Berkeley, CA 94720,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720;

    Fritz Haber Center for Molecular Dynamics, The Chaim Weizmann Institute of Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel;

    School of Chemistry, The Sackler Faculty of Sciences, Tel Aviv University, Tel Aviv 69978, Israel;

    Department of Chemistry, University of California, Berkeley, CA 94720,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    absorption spectra; plasmonics; quantum dot; exciton;

    机译:吸收光谱等离子体量子点激子;

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