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Occurrence control of charged exciton for a single CdSe quantum dot at cryogenic temperatures on an optical nanofiber

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Abstract

We discuss photo-luminescence characteristics of CdSe core/shell quantum dots at cryogenic temperatures using a hybrid system of a single quantum dot and an optical nanofiber. The key point is to control the emission species of quantum dot to charged excitons, known as trions, which have superior characteristics to neutral excitons. We investigate the photocharging behavior for the quantum dots by varying the wavelength and intensity of irradiating laser light, and establish a method to create a permanently charged situation which lasts as long as the cryogenic temperature is maintained. The present photocharging method may open a new route to applying the CdSe quantum dots in quantum photonics, and the hybrid system of photocharged quantum-dot and optical nanofiber may readily be applicable to a fiber-in-line single-photon generator.

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Acknowledgements

The authors thank Mark Sadgrove for his careful reading and critical comments to the manuscript. This work was supported by the Japan Science and Technology Agency (JST) through Strategic Innovation Program (Grant No. JPMJSV0918).

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Authors and Affiliations

  1. Center for Photonic Innovations and Institute for Laser Science, University of Electro-Communications, Chofu, Tokyo, 182-8585, Japan

    K. Muhammed Shafi & Kohzo Hakuta

  2. NS Materials Inc., Tsukushino, Fukuoka, 818-0042, Japan

    Kazunori Iida, Emi Tsutsumi & Akiharu Miyanaga

Authors
  1. K. Muhammed Shafi
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  2. Kazunori Iida
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  3. Emi Tsutsumi
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  4. Akiharu Miyanaga
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  5. Kohzo Hakuta
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Correspondence to Kohzo Hakuta.

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Shafi, K.M., Iida, K., Tsutsumi, E. et al. Occurrence control of charged exciton for a single CdSe quantum dot at cryogenic temperatures on an optical nanofiber. Appl. Phys. B 126, 68 (2020). https://doi.org/10.1007/s00340-020-7416-4

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