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Control of optical absorption nonlinearity in multi-layers quantum dots and rings

M. Solaimani

http://orcid.org/0000-0003-4111-4680

Department of Physics, Faculty of Sciences, Qom University of Technology, Qom, Iran

E-mail Address: solaimani@qut.ac.ir; solaimani.mehdi@gmail.com

Corresponding author.

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and

Leila Lavaei

Department of Physics, Faculty of Sciences, Qom University of Technology, Qom, Iran

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https://doi.org/10.1142/S0217979218500078Cited by:3 (Source: Crossref)

Abstract

In this paper, we study the effect of the number of wells, inner (R $_{in}$ $_{in}$ ) and outer (R $_{out}$ $_{out}$ ) quantum ring radiuses, and magnetic field as controlling tools to change the nonlinearity in optical properties of GaN/AlN constant radius multi-layer quantum dots and rings. It is seen that for small R $_{out}$ $_{out}$ and for fixed R $_{in}$ $_{in}$ and R $_{out}$ $_{out}$ , by increasing the number of wells, the nonlinearity increases, while for greater R $_{out}$ $_{out}$ and for fixed R $_{in}$ $_{in}$ and R $_{out}$ $_{out}$ , by increasing the number of wells the nonlinearity first decreases and then increases. For systems with greater R $_{in}$ $_{in}$ , the nonlinearity continually increases by increasing the number of wells. For fixed R $_{out}$ $_{out}$ , the critical well number, in which the nonlinearity changes its behavior, decreases by increasing the inner quantum ring radius R $_{in}$ $_{in}$ . The absorption coefficient does not undertake any blue or red shifts by changing the number of wells. In the systems with more number of wells, the nonlinearity reduces more rapidly by increasing the magnetic field. Finally, by increasing the radius R $_{out}$ $_{out}$ , the nonlinearity increases.

Keywords:

PACS: 78.67.De, 78.20.Ci, 78.66.Fd

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