What I did for T-wire laser project

T-shaped quantum wire (T-wire) is formed by putting two quantum well structures orthogonaly by cleaved edge overgrowth (CEO) method.

T-wire is the easiest way to control the potential structures, and we can make a very uniform one-dimensinal structure.

For the T-wire laser project, I am involved in three subjects described below.

1. Numerical simulation for optimizing T-shaped waveguides

I calculated optical modes of T-shaped waveguides, and optimized the structures.

As a result, total area of interaction between light and electronic states gets increased, and we can achieve lasing in a single T-wire laser structure.



[References]
[1] Y. Hayamizu et al., Appl. Phys. Lett. 81, 4937-4939 (2002).
[2] Y. Hayamizu et al., 26th. International conference on physics of semiconductors (Edinburgh, England)


2. Imaging measurement to distinguish the spectral origin

We observe spatial images of photoluminescence and lasing from a cleaved edge of T-wire laser.

As a result we can understand the origin of each PL peak and lasing.



[References]
[1] Y. Takahashiet al., submitted to Appl. Phys. Lett.
[2] Y. Takahashiet al., Quantum Electronics and Laser Science (QELS) Conference 2002.(Longbeach, USA)


3. Temperature dependence of the lasing property

We measured the temperature dependence of lasing property of a T-wire laser, and find that another quantum state becomes to lase for the higher temperature.



[References]
[1] S. Watanabeet al., Spring meeting of Physical Soceity of Japan, March, 2002(Kusatsu, Japan).

Power Point Presentation(Japanese)