Journal
NANO LETTERS
Volume 16, Issue 10, Pages 6117-6123Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b02331
Keywords
Unidirectional emission; single-quantum emitter; efficient single emitter; self-aligned coupling
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Funding
- National Research Foundation of the Korean government (MSIP) [NRF-2016R1A2A1A05005320]
- Future Semiconductor Device Technology Development Program - MOTIE (Ministry of Trade, Industry and Energy) [10044735]
- KSRC (Korea Semiconductor Research Consortium)
- Climate Change Research Hub of KAIST [N11160013]
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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 nanopyrarniclal 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.
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