All-optical switching due to state-filling in quantum dots

Details All-optical switching due to state-filling in quantum dots All-optical switching due to state-filling in quantum dots

2004-10-18

arxiv.org/abs/cond-mat/0410440v1

Appl. Phys. Lett. 84, 4059 (2004)

Physics

Condensed Matter

Materials Science

12 pages

Scientific paper

10.1063/1.1751617

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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