Optical manipulation of semiconductor quantum dots in superfluid helium

Masaaki Ashida; Kazuhiro Inaba; Tadashi Itoh

doi:10.1117/12.717243

22 March 2007 Optical manipulation of semiconductor quantum dots in superfluid helium

Masaaki Ashida, Kazuhiro Inaba, Tadashi Itoh

Proceedings Volume 6468, Physics and Simulation of Optoelectronic Devices XV; 64681H (2007) https://doi.org/10.1117/12.717243
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

Abstract

We have experimentally demonstrated purely optical manipulation of wide-gap semiconductor CuCl quantum dots in superfluid helium. The superfluidity provides an ideal cryogenic frictionless environment for the manipulation. In order to introduce the quantum dots into liquid helium, small particles of CuCl with a broad size-distribution ranging from 10 nm to 10 &mgr;m in radius have been fabricated from a bulk sample by laser ablation in a helium cryostat. We irradiated these particles with laser light covering the excitonic resonance levels of the quantum dots smaller than 50 nm to push them by using resonant radiation force. As a result, we have found that many quantum dots of which sizes range from 10 to 50 nm were transported and sorted over a macroscopic distance, ~1 cm. Importantly, the excitonic resonance condition was crucial for this optical manipulation. The result means that the resonant radiation force for the quantum dots is much stronger than the gravitational force. Feasibility of size-selective manipulation is also discussed.

Citation Download Citation

Masaaki Ashida, Kazuhiro Inaba, and Tadashi Itoh "Optical manipulation of semiconductor quantum dots in superfluid helium", Proc. SPIE 6468, Physics and Simulation of Optoelectronic Devices XV, 64681H (22 March 2007); https://doi.org/10.1117/12.717243

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KEYWORDS

Optical manipulation

Particles

Quantum dots

Laser ablation

Helium

Silicon

Semiconductors

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