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| Quantum Photonics with Optical Nanofibres |
| Prof Kohzo Hakuta |
University of Electro-Communications, Chofu |
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14:30, Friday 3 October 2014 | | Physics Seminar Room (Building 46/5081) |
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Prof Hakuta will discuss quantum photonics with optical nanofibres that may open a new route to manipulate single atoms and single photons. The key idea of the method is to use sub-wavelength diameter silica fibres, termed optical nanofibres, for strongly confining the photon-mode density around the nanofibre. First, he will discuss theoretically how various freedoms of atoms and photons can be manipulated with optical nanofibres, and the experimental demonstration of how such freedoms have been manipulated with optical nanofibres. Examples include single atom spectroscopy and efficient channeling of fluorescence photons into the guided modes. Regarding the channeling, Prof Hakuta's group has shown experimentally that, by placing one "atom" on nanofibre surface, the fluorescence photons are channeled into the guided modes with efficiency higher than 20%. Furthermore, he will show theoretically that the channeling efficiency can be enhanced to 90% or higher, by fabricating cavity structure on nanofibres. Recent progress on experimental realization of nanofibre-cavity system will be discussed. Prof Hakuta will discuss also the realization of the cavity QED conditions in the Purcell regime using the nanofibre-cavity system, and report the observation of significant enhancement of the spontaneous emission rate into the nanofibre guided modes for single quantum dots. Future prospects are also discussed.
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poster
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