Title: Optimization of quantum cascade laser operation by geometric design of cascade active band in open and closed models
Author(s):

	M.V. Tkach (Chernivtsi National University, 2 Kotsyubinsky St., 58012 Chernivtsi, Ukraine) ,
	Ju.O. Seti (Chernivtsi National University, 2 Kotsyubinsky St., 58012 Chernivtsi, Ukraine) ,
	I.V. Boyko (Chernivtsi National University, 2 Kotsyubinsky St., 58012 Chernivtsi, Ukraine) ,
	O.M. Voitsekhivska (Chernivtsi National University, 2 Kotsyubinsky St., 58012 Chernivtsi, Ukraine)

Using the effective mass and rectangular potential approximations, the theory of electron dynamic conductivity is developed for the plane multilayer resonance tunnel structure placed into a constant electric field within the model of open nanosystem, and oscillator forces of quantum transitions within the model of closed nanosystem. For the experimentally produced quantum cascade laser with four-barrier active band of separate cascade, it is proven that just the theory of dynamic conductivity in the model of open cascade most adequately describes the radiation of high frequency electromagnetic field while the electrons transport through the resonance tunnel structure driven by a constant electric field.

Key words: resonance tunnel nanostructure, conductivity, quantum cascade laser
PACS: 73.40.Gk, 85.30.Mn, 81.07.St

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