第39回　サイエンスカフェ講演会を下記の通り開催いたします。

みなさんのご参加をお待ちしております。

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講演日時：6月10日（火）１６時３０分～１８時

講演場所：T1号館8階　サイエンスカフェ

講演会講師：Daniel Bloch　教授

所属：Laboratoire de physique des lasers, CNRS(Centre　National de la recherche Scientifique) and Université Paris13
レーザー物理学研究所CNRSおよびパリ13大学兼務

官職：
Directeur de recherche de premeiere classe  (director of research -1st class,) or "research Professor"
第1級研究ディレクター（または 研究教授）

講演会題目：

Connecting Atoms and Nanophotonics: Spectroscopy of atoms under confinement

講演内容：
  The talk will describe our activities in Laboratoire de　physique des lasers at Paris13U.-Sorbonne-Paris-Cité (Villetaneuse campus), which combine the power of high resolution laser spectroscopy of atoms with specific effects associated to a confinement at a sub-wavelength scale.
This should make atomic vapours of interest for the　possibilities offered by nanotechnologies. We show that atomic vapours can be confined in micro- or nanocells (thin slice of vapour, and one dimensional confinement), or even to the voids region of an artificial opal of glass
nanospheres, hence realizing a three dimensional　confinement. Moreover, in spite of the thermal motion in the atomic vapour, sub-Doppler features are observed even in the frame of linear spectroscopy, which are attributed to transient effects induced by the confinement.

When exploring a distance to a surface smaller than ~100 nm, the fundamental atom-surface interaction (van der Waals electrostatic regime of the Casimir-Polder　interaction), which is a signature of vacuum fluctuations, induces shifts and distortions of the atomic lineshapes,
from which this atom-surface interaction can be measured. Our most recent measurements demonstrate a large increase of this interaction with the temperature of the vacuum, owing to a thermal excitation of surface modes, which couple with atomic transitions.