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Enhancement of Kerr nonlinearity at long wavelength in a quantum dot nanostructure |
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| Authors: | Seyyed Hossein Asadpour Mostafa Sahrai Rasoul Sadighi-Bonabi Amir Soltani Hamed Mahrami |
| Affiliation: | aResearch Institute for Applied Physics and Astronomy, University of Tabriz, Tabriz, Iran;bDepartment of Physics, Sharif University of Technology, Tehran, Iran;cEngineering Faculty of Bonab, Bonab, Iran |
| 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. |
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