Tamm plasmons are interface modes formed at the boundary between a metallic layer and a dielectric Bragg mirror.
They present advantages associated both to surface plasmons and to microcavities photonic modes. One of their
striking properties is that they can be spatially confined by structuring only the metallic part of the structure, thus
reducing the size of the mode and allowing various geometries without altering the optical properties of the active
layer. These modes are very good candidates for optimizing the emission properties of semiconductor
nanostructures. In particular, due to the relatively low damping and the versatility of the Tamm geometries, they
open new perspective for the development of hybrid metal/semiconductor lasers. In this paper, we will show that a
laser effect can be achieved in a bidimensional Tamm structure under pulsed optical pumping. We will also
demonstrate that the mode can be spatially confined, and that this results in a reduction of the pump power at
threshold.
Four-wave mixing can be stimulated or occur spontaneously: the latter effect, also known as parametric fluorescence,
can be explained only in the framework of a quantum theory of light, and it is at the basis of many
protocols to generate nonclassical states of the electromagnetic field. In this work we report on our experimental
study of spontaneous four wave mixing in microring resonators and photonic crystal molecules integrated on a
silicon on insulator platform. We find that both structures are able to generate signal and idler beams in the
telecom band, at rates of millions of photons per second, under sub-mW pumping. By comparing the experiments
on the two structures we find that the photonic molecule is an order of magnitude more efficient than the
ring resonator, due to the reduced mode volume of the individual resonators.
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