Giant Optical Non-Linearity and Optomechanics and with a Quantum Dot Embedded in a Photonic Waveguide

Jean-Philippe Poizat
April 3rd, 2018 JEAN-PHILIPPE POIZAT Institut Néel, Grenoble

I will present results in non-linear optics and in optomechanics obtained with a single InAs quantum dot (QD) embedded in a GaAs photonic wire.

I will first show that this system behaves as an ultra-low power all-optical switch in which a control beam of a few photons can trigger the reflection of a signal beam, based on the two mode giant non-linearity offered by this almost ideal one-dimensional system.

I will then show that this system features also a very strong strain-mediated coupling between the wire motion and the energy of the QD fundamental optical transition. This hybrid coupling realizes a versatile optomechanical transducer where, on the one hand, the QD energy can offer a sensitive read out of the wire position, and, on the other hand, the wire motion can be optically actuated via a single QD. Thanks to the very large strain gradient within the wire, this coupling can provide an image of the QD position with an accuracy in the nanometer range.

Finally, this strain-coupling can be used to tune the optical transition energy of a QD using a nano-manipulator to statically bend the waveguide.

Seminar, April 3, 2018, 12:30. ICFO’s Seminar Room

Hosted by Prof. Frank Koppens