Ultrafast single photon emitting quantum photonic structures based on a nano-obelisk

Je Hyung Kim, Young Ho Ko, Su Hyun Gong, Suk Min Ko, Yong Hoon Cho

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)


A key issue in a single photon source is fast and efficient generation of a single photon flux with high light extraction efficiency. Significant progress toward high-efficiency single photon sources has been demonstrated by semiconductor quantum dots, especially using narrow bandgap materials. Meanwhile, there are many obstacles, which restrict the use of wide bandgap semiconductor quantum dots as practical single photon sources in ultraviolet-visible region, despite offering free space communication and miniaturized quantum information circuits. Here we demonstrate a single InGaN quantum dot embedded in an obelisk-shaped GaN nanostructure. The nano-obelisk plays an important role in eliminating dislocations, increasing light extraction, and minimizing a built-in electric field. Based on the nano-obelisks, we observed nonconventional narrow quantum dot emission and positive biexciton binding energy, which are signatures of negligible built-in field in single InGaN quantum dots. This results in efficient and ultrafast single photon generation in the violet color region.

Original languageEnglish
Article number2150
JournalScientific reports
Publication statusPublished - 2013
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation (NRF-2013R1A2A1A01016914), the WCU Program (No. R31-2008-000-1071-0) of the Ministry of Education, the KAIST EEWS Initiative, and the GRC project of KI for the NanoCentury.

ASJC Scopus subject areas

  • General


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