| Project/Area Number |
25600118
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Optical engineering, Photon science
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| Research Institution | Keio University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 微小光共振器 / 光量子エレクトロニクス / 結晶成長 / 光エレクトロニクス / フォトニクス / 高Q値共振器 / 微小光学 |
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| Outline of Final Research Achievements |
We demonstrated a Q of 16,000 with a small whispering gallery mode cavity fabricated with laser heated pedestal method. We found that the Q is limited when the cross-section of the microcavity is polygonal, and developed pre-heating and tilted crystal growth technique to overcome this problem. Pre-heating is performed in order to polycrystalline the seed crystal before starting the growth and allow the cavity to have circular shape. Tilted growth is also attractive because it may allow us to have circular cavity where the crystal structure is maintained.
We also studied the optical nonlinearities in crystalline microcavity by using CaF2, and found that a thermo-mechanical oscillation occurs due to the interplay between the negative thermos optic effect and thermal expansion of the material. We found that the transmittance oscillates and this phenomena is pronounced for a smaller cavity.
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