Non-resonant dot-cavity coupling and its potential for resonant single-quantum-dot spectroscopy
Non-resonant dot-cavity coupling and its potential for resonant single-quantum-dot spectroscopy
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DOI：
10.1038/nphoton.2009.215
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发表时间：
2009-12-01
期刊：
影响因子：
35
通讯作者：
Michler, P.
中科院分区：
文献类型：
--
作者：
Ates, S.;Ulrich, S. M.;Michler, P.
非共振发射极-腔耦合是最近观察到的一种有趣的效应，即使在强失谐的单量子点-微腔系统中也可以观察到意想不到的显著腔共振发射（1-3）。这一现象表明在这些固态系统中存在着强而复杂的光-物质相互作用，并对单光子源（4-6）和量子信息应用（1- 3，7，9）具有重要意义。我们研究了共振激发下微柱中单个量子点的非共振点-腔耦合，揭示了量子点模式失谐对正、负量子点模式失谐的显著影响。我们的研究结果表明，声子介导的退相在点腔耦合中的主导作用，提供了一个新的视角，在文献中正在进行的有争议的讨论。这种增强的洞察力对于各种基于腔的量子电动力学系统至关重要，这些系统使用经历声子耦合的发射器，例如金刚石（10）和胶体纳米晶体（11）中的色心。非共振耦合被证明是一个多功能的“监测”工具，用于观察相关的量子点的s-壳层发射特性和无背景光子统计。
Non-resonant emitter-cavity coupling is a fascinating effect recently observed as unexpected pronounced cavity resonance emission even in strongly detuned single quantum dot-microcavity systems(1-3). This phenomenon indicates strong, complex light-matter interactions in these solid-state systems, and has major implications for single-photon sources(4-6) and quantum information applications(1-3,7,9). We study non-resonant dot-cavity coupling of individual quantum dots in micropillars under resonant excitation, revealing a pronounced effect over positive and negative quantum dot mode detunings. Our results suggest a dominant role of phonon-mediated dephasing in dot-cavity coupling, giving a new perspective to the controversial discussions ongoing in the literature. Such enhanced insight is essential for various cavity-based quantum electrodynamic systems using emitters that experience phonon coupling, such as colour centres in diamond(10) and colloidal nanocrystals(11). Non-resonant coupling is demonstrated to be a versatile 'monitoring' tool for observing relevant quantum dot s-shell emission properties and background-free photon statistics.