Self-aligned deterministic coupling of single quantum emitter to nanofocused plasmonic modes

Su-Hyun Gong, Je Hyung Kim, Young Ho Ko, Christophe Rodriguez, Jonghwa Shin, Yong Hee Lee, Le Si Dang, Xiang Zhang, Yong Hoon Cho

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The quantum plasmonics field has emerged and been growing increasingly, including study of single emitter-light coupling using plasmonic system and scalable quantum plasmonic circuit. This offers opportunity for the quantum control of light with compact device footprint. However, coupling of a single emitter to highly localized plasmonic mode with nanoscale precision remains an important challenge. Today, the spatial overlap between metallic structure and single emitter mostly relies either on chance or on advanced nanopositioning control. Here, we demonstrate deterministic coupling between three-dimensionally nanofocused plasmonic modes and single quantum dots (QDs) without any positioning for single QDs. By depositing a thin silver layer on a site-controlled pyramid QD wafer, three-dimensional plasmonic nanofocusing on each QD at the pyramid apex is geometrically achieved through the silver-coated pyramid facets. Enhancement of the QD spontaneous emission rate as high as 22 ± 16 is measured for all processed QDs emitting over ∼150-meV spectral range. This approach could apply to high fabrication yield on-chip devices for wide application fields, e.g., high-efficiency light-emitting devices and quantum information processing.

Original languageEnglish
Pages (from-to)5280-5285
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume112
Issue number17
DOIs
Publication statusPublished - 2015 Apr 28
Externally publishedYes

Keywords

  • Deterministic coupling
  • Exciton-photon coupling
  • Plasmonic nanofocusing
  • Purcell effect
  • Single-quantum emitter

ASJC Scopus subject areas

  • General

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