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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Giant quintic nonlinearities at slow light level in semiconductor quantum wells

Nitu Borgohain, Swapan Konar

Published Jun 15, 2015• 0 citations
Publisher

Abstract

Enhancement of higher order nonlinear susceptibilities are investigated in three level quantum well with a ladder configuration in the regime of electromagnetically induced transparency. We have identified the existence of giant third and fifth order nonlinear susceptibilities of the order ~10-22 m4/V4 at pump wavelength of 9.6 μm. The group velocity is reported to be slowed down by 104 times compared to the speed of light in vacuum.

DOI
10.1117/12.2181720

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A four level ladder scheme is employed for the realization of slow light large Kerr nonlinear indices in an asymmetric semiconductor three-coupled-quantum-well (TCQW) structure based on intersubband transitions. It is shown that a giant Kerr nonlinearity accompanied with negligible loss can be achieved by properly tuning the intensity of the control fields. A dressed state analysis is given to explain the origin of such a transparency based on slow light enhanced Kerr nonlinearity in this solid medium. In addition, we show that the three-photon detuning plays the important role in enhancing the third-order nonlinearity of the TCQW medium, and may provide new possibilities for technological applications in nonlinear optics and optical switching.
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