期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 112, 期 17, 页码 5280-5285出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1418049112
关键词
exciton-photon coupling; plasmonic nanofocusing; deterministic coupling; single-quantum emitter; Purcell effect
资金
- National Research Foundation of the Ministry of Education [NRF-2013R1A2A1A01016914, NRF-2013R1A1A2011750]
- Industrial Strategic Technology Development Program of the Ministry of Knowledge Economy [10041878]
- Climate Change Research Hub of Korea Advanced Institute of Science and Technology [N01150041]
- Korean Federation of Science and Technology Societies
- US Air Force Office of Scientific Research [FA9550-12-1-0197]
- Ministry of Science, ICT & Future Planning, Republic of Korea [N01150041] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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 similar to 150-meV spectral range. This approach could apply to high fabrication yield onchip devices for wide application fields, e.g., high-efficiency light-emitting devices and quantum information processing.
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