Manipulation of CdSe/ZnS quantum dots in room-temperature fluid with an inhomogeneous electric field and optical excitation

Mitsutaka Kumakura; Takayuki Shimomura; Riki Asano; Goro Nozue; Kiroku Yamamoto; Takeshi Moriyasu

doi:10.1117/12.2573798

15 June 2020 Manipulation of CdSe/ZnS quantum dots in room-temperature fluid with an inhomogeneous electric field and optical excitation

Mitsutaka Kumakura, Takayuki Shimomura, Riki Asano, Goro Nozue, Kiroku Yamamoto, Takeshi Moriyasu

Author Affiliations +

Proceedings Volume 11522, Optical Manipulation and Structured Materials Conference 2020; 115220V (2020) https://doi.org/10.1117/12.2573798
Event: SPIE Technologies and Applications of Structured Light, 2020, Yokohama, Japan

Abstract

We successfully demonstrated the manipulation of CdSe/ZnS quantum dots with a diameter of nearly 6 nm in organic solvent at room temperature by applying an intense electric field (1.7 MV/m) under resonant optical excitation (the wavelength 532nm). From the time-variation of the quantum dot distribution monitored by fluorescence imaging, it was experimentally found that the quantum dots gather around the local maximum of the electric field intensity and the potential energy applied on the quantum dot under the optical excitation is estimated to be nearly 400 K, which is approximately 20 times larger than that expected with conventional dielectrophoresis. Such a large potential energy is considered to be due to the Stark effect of the exciton created in the optically excited quantum dot.

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Mitsutaka Kumakura, Takayuki Shimomura, Riki Asano, Goro Nozue, Kiroku Yamamoto, and Takeshi Moriyasu "Manipulation of CdSe/ZnS quantum dots in room-temperature fluid with an inhomogeneous electric field and optical excitation", Proc. SPIE 11522, Optical Manipulation and Structured Materials Conference 2020, 115220V (15 June 2020); https://doi.org/10.1117/12.2573798

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