| Project/Area Number |
11640401
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
物理学一般
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| Research Institution | Kochi University of Technology |
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Principal Investigator |
KIMURA Masahiro Department of Intelligent Mechanical System Engineering, Professor, 工学部, 教授 (40028238)
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2001: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2000: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1999: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Microcavity / Microparticle / Ion trap / Laser action / Mie scattering / MDR / 微小共振器 / 色素レーザー |
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| Research Abstract |
We have studied resonant light scattering from a single micro-droplet and discussed the laser action of the droplet doped with dye molecules. Since photons confined inside the droplet correspond to electrons bound in an atom, such droplets are sometimes called photonic atoms.
In our experiment, a single droplet of glycerol doped with dye molecules was levitated in an ion trap. The droplet was optically excited by a pump laser, and the emission from the droplet was observed through an optical spectrometer and a microscope. Since the droplet levitated in the ion trap is naturally shaped to an almost real sphere, some resonant modes of the light waves are very efficiently confined in the droplet and the comparison with theory can be made more rigorously compared to using solid spheres. The Q-value of the resonator is extremely high. This lowers the threshold for the lasing of the droplet.
In order to investigate the characteristics of the lasing action, we have made the following
measurements :
1) Dependence on the power of exciting laser
2) Polarization properties
3) Dependence on the concentration of dye molecules.
From these measurements we have determined the modes of laser radiation and discussed the lasing mechanism.
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