2013 Fiscal Year Annual Research Report
フォノンの光変調による電子励起状態の間接的制御の理論
| Project/Area Number |
13J10823
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
ウエン デユイヴイ 大阪府立大学, 21世紀科学研究機構, 特別研究員(PD)
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| Keywords | laser cooling / opto-mechanical coupling / super-sensitive measurement / semiconductor cooling / exciton photoluminescence / nanoparticles / energy transfer / FDTD |
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| Research Abstract |
The understanding of opto-mechanical systems'dynamics under the colltrol of light-induced force :
a) Dynamics of a mechanical oscillator in an environment with specific properties for the application in scanning probe microscopy has been clarified : The oscillator vibration amplitude has been suppressed to about 2 orders in magnitude hnplying the enhancement of measurement accuracy from the nano- to the femto-meter scale. Under collisions with ambientparticles, the oscillator can be excited to higher order oscillation. These achievements were presented at the interlational conference CLEO-PR & OECC/PS 2013.
b) In order to examine the laser cooling toward the mechanical ground state with applications in the super-sensitive measurement and quantum information, the Hamiltonian formalism has been used. The unstable oscillations seen in a)[N. D. Vy & T. Iida, App1. Phys. Lett. 102. 091101 (2013).] has been examined and the stability condition is clarified with more simple collditions than standard criterions. Hence, a limitation for the input power, the opto-mechanical coupling strength G, and also the cooling ratio are obtained. An important result is : the achieved G is of the order of the cavity decay rate, i.e., high coupling strength cannot be realized for good OMCs. This limits the cooling rate and gives a minimum effective temperature and quantum number. Hellce, a set of parameter is required for a certain system to achieve the quantum ground state (Submitted).
The current studies involve : The photon-phonon coupling in semiconductor apPlying in the cooling of interactive phonon to control excitons photolumhlescence by cooperating the semiconductor cooling and the excitonic relaxation dynamics, The optimization of energy transfer in one- and then in two-dimensional systems, and The trapping of interacting nanoparticles array using arranged nanoholesusing FDTD method.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
(i) Laser cooling for the thin film has been successfully studied by the Hamiltonian formalism, which is the basis of my research pulpose. The approach is applicable for any system having similar model. Mechanicaloscillator with excitons embedded within it is a good candidate to study the excitonic affection on the lasercoolillg. Quantum wells embedded Withn optical microcavity-a model used to realize Bose-Eillstein condensation (BEC)-is being studied. Photon-phonon coupling in semiconductor from the exciton dynamics vieWpoilt will be studied in the frrst time to enhance the exciton relaxation process and the BEC at high temperature.
(ii) The effective energy transfer in arranged nanoparticle systems is being examined. FDTD method is explored for the nanoholes to achieve the field intensity and optical fbrce exerted on a tested particle over the system.
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| Strategy for Future Research Activity |
(i) Starting from the first principle theory, the photon-phonon interacting energy can be analyzed ; experimentaldata helps to modify interacting parameters. Achieved quantities is put in the general picture of interacting excitons to examine exciton dynamics and photoluminescence, I would like to perform analytical calculation toachieve solve this problem.
(ii) Using electromagnetic simulation method, optically related quantities fbr nanoscale structure are achieved and different models can be studied. I would like to consider the combination with my developed method and such asimulation method to determine various types of incident fields.
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Research Products
(4 results)
