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The scattering matrix is a fundamental tool to quantitatively describe the properties of resonant systems. In particular, it enables the understanding of many photonic devices of current interest, such as photonic metasurfaces and nanostructured optical scatterers. In this contribution, we show that the scattering matrix of a photonic system is completely determined by its quasinormal modes, i.e.,...
The interaction of light with suitably designed artificial nanostructures, such as metasurfaces or photonic crystals, can lead to a strong chiral response. Such chirality is not only essential for realizing miniature components to manipulate polarization, but also opens new avenues in chiral sensing, emission control, and topological photonics. An extreme possible consequence of a system's chirality...
By using theory and experiments, we investigate a new mechanism based on spontaneous synchronization of random waves which generates ultrafast subwavelength rare events in integrated photonic chips.
We demonstrate soliton fission induced by free-carriers for the first time. Using time-resolved near-field measurements, we directly observe the nonlinear pulse evolution along the 1.5 millimeter nanophotonic waveguide in-situ, a record short fission length.
We show the importance of polarization and phase engineering when designing quantum information devices. Using the example of a photonic-crystal waveguide we demonstrate, for the first time, designs for an integrated quantum dot spin-photon interface.
Using a silicon slow-light photonic crystal waveguide, we demonstrate the operation of a dynamic delay line based on an ultrafast indirect photonic transition to alter the group velocity of a pulse. We show continuously tuneable delays of up to 20 ps, using a waveguide just 300 µm in length. Our approach is scalable, in that both the maximum delay and capacity of the buffer are proportional to the...
We demonstrate the ultrafast tilting of the dispersion curve of a photonic crystal waveguide following the absorption of a femtosecond pump pulse. By shaping the pump cross section with a shadow mask, different waveguide eigenmodes have different spatial overlaps with the perturbation, leading to a local flattening of the dispersion by up to 11%. Such partial mode perturbation can be used to adiabatically...
We demonstrate that we can switch the transmission of a directional coupler from one output port to another within a time as short as 3 ps with laser pulse energies of less than 10 pJ.
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