Details

Autor(en) / Beteiligte

• Gopal, A.V.
• Simoyama, T.
• Yoshida, H.
• Jun-ichi Kasai
• Mozume, T.
• Ishikawa, H.

Titel

Intersubband absorption saturation in InGaAs-AlAs-AlAsSb coupled quantum wells

Ist Teil von

• IEEE journal of quantum electronics, 2003-11, Vol.39 (11), p.1356-1361

Ort / Verlag

New York: IEEE

Erscheinungsjahr

2003

Link zum Volltext

• IEEE_Xplore

Quelle

IEEE Xplore

Beschreibungen/Notizen

• This paper gives saturation (switching) energy (I/sub S/) estimates in an all-optic switch material based on absorption saturation in InGaAs-AlAs-AlAsSb coupled-double quantum wells (cDQWs). A model based on density matrix theory for a 4-level system is used to simulate the pulsed excitation conditions of the experiment in the communication wavelength region. The theoretical estimates are compared with experimentally determined values. A comparison of the I/sub S/ in two different cDQWs (one with an indium composition in the well of about 53% and without an AlAs stopping layer at the well-barrier interface and another with 72% indium and an AlAs stopping layer) clearly shows that the samples with high indium content are of a better quality compared to those with lattice-matched indium composition (53%). An order-of-magnitude reduction in the I/sub S/ in an all-optic switch based on cDQWs with high indium content is reported.