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Phys Rev Lett. 2003 Feb 7;90(5):057403. Epub 2003 Feb 5.

Theoretical study of the optical manipulation of semiconductor nanoparticles under an excitonic resonance condition.

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Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Japan.


We theoretically study the mechanical interaction between radiation and a semiconductor nanoparticle, based on a microscopic model of confined excitons. The exerted force is calculated by using the Maxwell stress tensor expressed in terms of the microscopic response field. The numerical demonstrations clarify the following: (1) The enhancement of the force by using electronic resonance is remarkable for a particle with a radius of less than 100 nm for semiconductor materials. (2) The spectral peak position of the exerted force is considerably sensitive to nanoscale-size changes which would be useful for highly accurate size-selective manipulation.

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