Short-wavelength intersubband transitions down to 1.6 μm in ZnSe/BeTe type-II superlattices

Akimoto, R.; Kinpara, Y.; Akita, K.; Sasaki, F.; Kobayashi, S.
January 2001
Applied Physics Letters;1/29/2001, Vol. 78 Issue 5, p580
Academic Journal
We report photoinduced electron intersubband absorption in ZnSe/BeTe type-II superlattices. The wavelength of the intersubband transition as short as 1.6 μm, covering the 1.55 μm optical communication wavelengths within its absorption band width (∼250 nm), is achieved in the ZnSe/BeTe SLs with 4.5 ML-thick ZnSe layers. The intensity in photoinduced intersubband absorption increases sublinearly with pump intensity, reflecting the characteristic recombination processes of electron-hole pairs in a heterostructure with type-II band alignment. © 2001 American Institute of Physics.


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