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{\Large \bf Laser Quantum Optics Group}\\

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Professor          &:&Yusaburo~Segawa \\
Associate Professor &:&Bao-ping~Zhang~and~Kodo~Kawase \\
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(http://www.phys.tohoku.ac.jp/shoukai/lazer-q-e.html)\\
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    The laboratory of Laser Quantum Optics aims to understand
interactions between light and materials and to apply such phenomena
to photo-functional devices. When the dimension of a material is close
to the de Broglie wavelength of an electron (several to tens of
nanometers), the material reveals new features associated with changes
in the electronic band structure. These modifications, known as
quantum confinement effects, are being extensively studied and are
used to artificially control the optical properties of materials.
   In order to study the quantum confinement effect, this laboratory
Is working on the development of growth techniques of ionic crystals 
(CuCl) and II-VI semiconductors (ZnO, CdSe, ZnSe) quantum structures 
such as quantum wells, quantum wires and quantum dots. 
   On the other hand, it is known that light with a particular wavelength
can no longer exist in certain periodic structures and excited atoms
can no longer emit light of this wavelength. Thus, it is theoretically
forecast that natural light emission may be artificially controllable
in such structures.
   Thus, the laboratory of Laser Quantum Optics is endeavoring to
develop new optical devices that utilize the precise geometrical
arrangements of materials to control both electronic band structures
and photonic band structures and thereby obtain optimum control of
optical properties.

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