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Enhancement of Kerr nonlinearity at long wavelength in a quantum dot nanostructure
, Article Physica E: Low-Dimensional Systems and Nanostructures ; Volume 43, Issue 10 , August , 2011 , Pages 1759-1762 ; 13869477 (ISSN) ; Sahrai, M ; Sadighi Bonabi, R ; Soltani, A ; Mahrami, H ; Sharif University of Technology
2011
Abstract
The giant Kerr nonlinearity with reduced linear and nonlinear absorption in a four-level quantum dot by employing the tunnel coupling is investigated. It is shown that by enhancement of tunnel coupling value the Kerr nonlinearity increases and at the same time linear and nonlinear absorption reduces at the long wavelength which is very important for communicational applications. Enhanced of Kerr nonlinearity in a double quantum dots is investigated. It is found that the electron tunneling has an essential role to reducing the linear absorption and increasing the Kerr nonlinearity at long wavelength