All-optical switching due to state-filling in quantum dots
R. Prasanth, J.E.M. Haverkort, A. Deepthy, E.W. Bogaart, J.J.G.M. van, der Tol, E.A. Patent, G. Zhao, Q. Gong, P.J. van Veldhoven, R. Noetzel and, J.H. Wolter
TL;DR
This paper demonstrates all-optical switching in a Mach-Zehnder interferometer using quantum dots, showing that the switching is due to state-filling effects with high efficiency and wavelength insensitivity.
Contribution
It introduces a novel all-optical switch based on quantum dot state-filling within a Mach-Zehnder interferometer, with detailed fabrication and experimental validation.
Findings
Switching efficiency of 2 rad/μW absorbed power
Wavelength insensitivity due to broad quantum dot distribution
Refractive index change solely attributed to quantum dots
Abstract
We report all-optical switching due to state-filling in quantum dots (QDs) within a Mach-Zehnder Interferometric (MZI) switch. The MZI was fabricated using InGaAsP/InP waveguides containing a single layer of InAs/InP QDs. A 1530-1570 nm probe beam is switched by optical excitation of one MZI-arm from the top. By exciting below the InGaAsP bandgap, we prove that the refractive index nonlinearity is only due to the QDs. The switching efficiency is 2 rad/(microW absorbed power). Probe wavelength insensitivity was obtained using a broad distribution of QDs.
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