Nano-Optical Manipulation Using Resonant Radiation Force

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Nano-Optical Manipulation Using Resonant
Radiation Force
T.Iida and H. Ishihara, Nano-Optical Manipulation
Using Resonant Radiation Force, in Progress in
Nano-Electro-Optics VI Nano Optical Probing,
Manipulation, Analysis, and Their Theoretical
Bases, edited by Motoichi Ohtsu (Springer-Verlag,
Berlin 2008), pp.115-168.

• Ashida Lab.
• Bando Shinichiro

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Contents

• Introduction
• Sample
• Optical manipulation
• Resonant light
• Motivation
• Experiment
• laser ablation
• manipulation laser
• setup
• Result
• Summary

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Sample
CuCl
wide-gap semiconductor3.4eV
large exciton binding energy197meV
Excitons in CuCl nanoparticle
exciton
Need to sort out size of particle for
application
radius
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Optical manipulation
Gradient force
Scat.Abs. force
force
absorption
scattering
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Size dependence of the acceleration induced by
the radiation force
Light-matter interaction becomes too weak in
nanoparticle
Scat.Abs. force becomes very small
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Resonant light
Radiation force becomes very large using resonant
light
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Resonant radiation force
Energy of incident light
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Motivation
Using resonant radiation force
Controlling the nano-size particles
size-selection by accessing quantum
mechanical individualities
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Experimental condition
Laser ablation
wavelength 532nm (2.33eV) pulse width
10ns repetition 10Hz intensity 0.3J/cm2
Manipulation laser
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Setup
Si substrate
CuCl
Ablation laser
CuCl
Si substrate
Ablation laser
Manipulation laser
Manipulation laser
Si substrate
NdYAG laser
Tisapphire laser
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Result
NdYAG laser
Tisapphire laser
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Summary
Succeed in controlling nano-particles
using resonant light.
Future plan
Study of the possibility
of nanoscale size selection