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We design, fabricate and test an integrated silicon photonics chip for intermodal four wave mixing, whose phase-matching relays on the modal dispersions of different waveguide modes. This phase-matching technique allows for tunable and broadband wavelength conversion and generation. We demonstrate that idler and signal photons can be generated with 800 nm spectral distance in between. We measure several intermodal combinations, with up to the third order mode involvement. We demonstrate a maximum conversion efficiency of-12.4 dB from 1,468.5 to 1,641.1 nm with a bandwidth of 11 nm. We also prove the high and broadband tunability of the generated signal by scanning the pump wavelength when the signal wavelength is fixed. All these features make the intermodal four wave mixing a viable solution for all optical processing in the near as well as in the mid infrared and for quantum applications.
A photonic wire antenna embedding individual quantum
dots (QDs)
constitutes a promising platform for both quantum photonics and hybrid
nanomechanics. We demonstrate here an integrated device in which on-chip
electrodes can apply a static or oscillating bending force to the
upper part of the wire. In the static regime, we achieve control over
the bending direction and apply at will tensile or compressive mechanical
stress on any QD. This results in a blue shift or red shift of their
emission, with direct application to the realization of broadly tunable
sources of quantum light. As a first illustration of operation in
the dynamic regime, we excite the wire fundamental flexural mode and
use the QD emission to detect the mechanical vibration. With an estimated
operation bandwidth in the GHz range, electrostatic actuation opens
appealing perspectives for the exploration of QD-nanowire hybrid mechanics
with high-frequency vibrational modes.
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