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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >One-dimensional polaritons with size-tunable and enhanced coupling strengths in semiconductor nanowires
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One-dimensional polaritons with size-tunable and enhanced coupling strengths in semiconductor nanowires

机译：具有尺寸可调和增强的半导体纳米线耦合强度的一维极化子

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摘要

Strong coupling of light with excitons in direct bandgap semiconductors leads to the formation of composite photonic-electronic quasi-particles (polaritons), in which energy oscillates coherently between the photonic and excitonic states with the vacuum Rabi frequency. The light-matter coherence is maintained until the oscillator dephases or the photon escapes. Exciton-polariton formation has enabled the observation of Bose-Einstein condensation in the solid-state, low-threshold polariton lasing and is also useful for terahertz and slow-light applications. However, maintaining coherence for higher carrier concentration and temperature applications still requires increased coupling strengths. Here, we report on size-tunable, exceptionally high exciton-polariton coupling strengths characterized by a vacuum Rabi splitting of up to 200 meV as well as a reduction in group velocity, in surface-passivated, self-assembled semiconductor nanowire cavities. These experiments represent systematic investigations on light-matter coupling in one-dimensional optical nanocavities, demonstrating the ability to engineer light-matter coupling strengths at the na-noscale, even in non-quantum-confined systems, to values much higher than in bulk.
机译：光与激子在直接带隙半导体中的强耦合导致形成复合光子-电子准粒子（极化子），其中能量以真空拉比频率在光子和激子态之间相干振荡。保持光物质相干，直到振荡器移相或光子逸出为止。激子-极化子的形成使得能够在固态，低阈值极化子激射中观察到玻色-爱因斯坦凝聚，并且还可以用于太赫兹和慢光应用。但是，为更高的载流子浓度和温度应用保持一致性，仍然需要提高耦合强度。在这里，我们报告了在表面钝化，自组装半导体纳米线腔体中尺寸可调，非常高的激子-极化子耦合强度，其特征在于高达200 meV的真空拉比分裂以及群速度的降低。这些实验代表了对一维光学纳米腔中光-质耦合的系统研究，证明了即使在非量子限制的系统中，也可以将纳米级的光-质耦合强度设计为远高于整体的值。

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  • 作者

    Lambert K. van Vugt; Brian Piccione; Chang-Hee Cho; Pavan Nukala; Ritesh Agarwal;

  • 作者单位

    Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104;

    Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104;

    Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104;

    Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104;

    Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104;

  • 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

    cavity; waveguide; cadmium sulfide;

    机译：腔波导;硫化镉;

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