Single quantum dot controls a plasmonic cavity'ss cattering and anisotropy

Thomas Hartsfield, Wei Shun Chang, Seung Cheol Yang, Tzuhsuan Ma, Jinwei Shi, Liuyang Sun, Gennady Shvets, Stephan Link, Xiaoqin Li

Research output: Contribution to journalArticlepeer-review


Plasmonic cavities represent a promising platform for controlling light-matter interaction due to their exceptionally small mode volume and high density of photonic states. Using plasmonic cavities for enhancing light's coupling to individual two-level systems, such as single semiconductor quantum dots (QD), is particularly desirable for exploring cavity quantum electrodynamic (QED) effects and using them in quantum information applications. The lack of experimental progress in this area is in part due to the difficulty of precisely placing a QD within nanometers of the plasmonic cavity. Here, we study the simplest plasmonic cavity in the form of a spherical metallic nanoparticle (MNP). By controllably positioning a semiconductor QD in the close proximity of the MNP cavity via atomic force microscope (AFM) manipulation, the scattering spectrum of the MNP is dramatically modified due to Fano interference between the classical plasmonic resonance of the MNP and the quantized exciton resonance in the QD. Moreover, our experiment demonstrates that a single two-level system can render a spherical MNP strongly anisotropic. These findings represent an important step toward realizing quantum plasmonic devices.

Original languageEnglish (US)
Pages (from-to)12288-12292
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number40
StatePublished - Oct 6 2015
Externally publishedYes


  • Fano resonance
  • Optical spectroscopy|hybrid nanostructures|quantum systems
  • Plasmonic cavities

ASJC Scopus subject areas

  • General


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