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Optical Nanofibers for Manipulating Atoms and Photons
https://uec.repo.nii.ac.jp/records/1143
https://uec.repo.nii.ac.jp/records/1143fb2414d9-da11-4619-b19c-845839c2b89c
名前 / ファイル | ライセンス | アクション |
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9000000344.pdf (4.8 MB)
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Item type | 学位論文 / Thesis or Dissertation(1) | |||||
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公開日 | 2009-03-24 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Optical Nanofibers for Manipulating Atoms and Photons | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_46ec | |||||
資源タイプ | thesis | |||||
その他(別言語等)のタイトル | ||||||
その他のタイトル | ナノ光ファイバーによる原子と光子の操作 | |||||
言語 | ja | |||||
著者 |
カリプラサンナ, ナヤク
× カリプラサンナ, ナヤク |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | This thesis presents the development of novel methods for manipulating atomsand photons using an optical nanofiber. Optical nanofibers are vacuum-clad silicafibers with subwavelength-diameter. These optical nanofibers can support only thefundamental mode propagation through the guided mode. The field in the guidedmode is strongly confined in space and a part of the field lies outside the fiber, inthe evanescent region. Such unique property of the field around the optical nanofibermakes it a promising candidate for various quantum optics experiments.Due to the confinement of the field in the guided modes, the spontaneous emissionof atoms can be strongly modified around an optical nanofiber. In this thesis itis experimentally demonstrated that a significant fraction of atomic emission can bechanneled into the guided modes of the nanofiber. Optical nanofibers are realized usingadiabatically tapered single mode optical fibers. Experiments are performed byoverlapping cold Cs-atoms, from a magneto-optical trap (MOT), with the nanofiberand observing fluorescence photons through the guided modes of the nanofiber. Thenanofiber suppresses any scattering light into the guided modes and high coupling efficiencyof fluorescence photons to the guided modes enables us to measure fluorescenceof a very small number of atoms present in the evanescent region of the nanofiber. Sucha technique is further implemented for measuring the density profile and the temperatureof the cold atom cloud.The fluorescence excitation spectrum of cold atoms around an optical nanofiberis investigated by detecting the fluorescence photons through the guided modes. Due tothe inherent nature of the nanofiber method the observed spectrum strongly reflects theeffect of van der Waals (vdW) interaction between atom and nanofiber surface whichwould be dominant for distances closer than /2 from the surface. The observationsare understood through a process where atoms around the nanofiber fall into the vdWpotential forming atom-surface bound states. The observed spectral profiles are wellreproduced from theory considering free-to-bound (photo-association) and bound-toboundtransitions. Furthermore it is demonstrated that the surface conditions can bemodified by irradiating the MOT atoms around the nanofiber using a violet laser radiation.The surface conditions are modified in such a way that the atoms are kept fromfalling into the vdW potential and behave as almost free atoms around the nanofiber.Under such free-atom conditions the photon correlation measurements are performed.The observed antibunching of fluorescence photons demonstrates that singleatoms can be probed efficiently by detecting the fluorescence through the guidedmodes of the nanofiber.The photon correlations are further investigated by varying atom number aroundthe nanofiber. Due to the single spatial mode nature of the nanofiber guided modes, thephoton correlations evolve as interplay between both the first- and second-order coherenceswith increasing atom number. It is shown that both bunching and antibunchingtypes of first-order coherences can contribute to the correlations. However, it is alsoshown that the type of the first-order coherence and its contribution to the correlationscan be strongly affected by the observation and excitation geometries.This work may open up new perspectives for implementing optical nanofibersfor exploring atom-surface interactions, single-atom detection, single photon generationand further applications in the fields of quantum optics and quantum informationtechnologies. | |||||
学位名 | ||||||
学位名 | 博士(理学) | |||||
学位授与機関 | ||||||
学位授与機関名 | 電気通信大学 | |||||
学位授与年度 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 2008 | |||||
学位授与年月日 | ||||||
学位授与年月日 | 2009-03-24 |