Unidirectional Emission of a Site-Controlled Single Quantum Dot from a Pyramidal Structure

Sejeong Kim, Su Hyun Gong, Jong Hoi Cho, Yong Hoon Cho

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Emission control of a quantum emitter made of semiconductor materials is of significance in various optical applications. Specifically, the realization of efficient quantum emitters is important because typical semiconductor quantum dots are associated with low extraction efficiency levels due to their high refractive index contrast. Here, we report bright and unidirectional emission from a site-controlled InGaN quantum dot formed on the apex of a silver-coated GaN nanopyramidal structure. We show that the majority of the extracted light from the quantum dot is guided toward the bottom of the pyramid with high directionality. We also demonstrate that nanopyramid structures can be detached from a substrate, thus demonstrating great potential of this structure in various applications. To clarify the directional radiation, the far-field radiation pattern is measured using Fourier microscopy. This scheme will pave the way toward the realization of a bright and unidirectional quantum emitter along with easy fabrication and large-area reproducibility.

Original languageEnglish
Pages (from-to)6117-6123
Number of pages7
JournalNano Letters
Issue number10
Publication statusPublished - 2016 Oct 12
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation (NRF- 2016R1A2A1A05005320) of the Korean government (MSIP), the Future Semiconductor Device Technology Development Program (10044735) funded by MOTIE (Ministry of Trade, Industry and Energy) and the KSRC (Korea Semiconductor Research Consortium), and the Climate Change Research Hub of KAIST (grant no. N11160013).

Publisher Copyright:
© 2016 American Chemical Society.


  • Efficient single emitter
  • Self-aligned coupling
  • Single-quantum emitter
  • Unidirectional emission

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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