We report all-optical switching due to state-filling in quantum dots (QDs). The switching energy is as low as 6 fJ since state-filling requires only 2 electron-hole pairs per QD. The single layer of InAs/InP QDs is inserted within a InGaAsP/InP waveguide, which is processed into a Mach-Zehnder Interferometric space switch (MZI). A 1530-1570 nm probe beam is switched by optical excitation of one MZI-arm from above. By exciting below the InGaAsP bandgap, we prove that the refractive index nonlinearity is entirely due to state-filling in the QDs.
|Title of host publication||Proc. [CD-ROM] Photonics 2004 Cochin, India (2004) (invited presentation)|
|Place of Publication||Cochin, India|
|Publication status||Published - 2004|
|Event||Photonics 2004, Cochin, India - Cochin, India|
Duration: 1 Jan 2004 → …
|Conference||Photonics 2004, Cochin, India |
|Period||1/01/04 → …|