Nanoscale luminescence selection of quantum dot using focused-ion-beam

Minho Choi; Seongmoon Jun; Kie Young Woo; Hyun Gyu Song; Hwanseop Yeo; Sunghan Choi; Doyoun Park; Chung-Hyun Park; Yong-Hoon Cho

doi:10.1117/12.2607510

5 March 2022 Nanoscale luminescence selection of quantum dot using focused-ion-beam

Minho Choi, Seongmoon Jun, Kie Young Woo, Hyun Gyu Song, Hwanseop Yeo, Sunghan Choi, Doyoun Park, Chung-Hyun Park, Yong-Hoon Cho

Author Affiliations +

Proceedings Volume PC12010, Photonic and Phononic Properties of Engineered Nanostructures XII; PC1201017 (2022) https://doi.org/10.1117/12.2607510
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

Epitaxially-grown quantum dots (QDs) play an essential role in various quantum photonic technologies as on-demand solid-state single-photon sources. However, these QDs often suffer from the adjacent unintentional emitters such as wetting layers and other adjacent QDs, which attribute to the background noise of the QD emission and fundamentally limit the single-photon purity. Here, we develop a nanoscale site-selective luminescence quenching method using focused ion beam (FIB) and demonstrate improved single-photon purity from site-controlled single QD. Moreover, the reduced background noise led to QD emissions at higher temperatures. This nondestructive method retains the photonic structure and quenches the unwanted luminescence simultaneously, thereby indicating its promising potential in quantum emitters integrated with photonic devices.

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Minho Choi, Seongmoon Jun, Kie Young Woo, Hyun Gyu Song, Hwanseop Yeo, Sunghan Choi, Doyoun Park, Chung-Hyun Park, and Yong-Hoon Cho "Nanoscale luminescence selection of quantum dot using focused-ion-beam", Proc. SPIE PC12010, Photonic and Phononic Properties of Engineered Nanostructures XII, PC1201017 (5 March 2022); https://doi.org/10.1117/12.2607510

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KEYWORDS

Luminescence

Quenching (fluorescence)

Ion beams

Quantum wells

Signal to noise ratio

Single photon

Helium

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