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Since its discovery, nonlinear optics, whereby light can be used to control and interact with light, has generated enormous interest in many scientific areas [1]. Plasmonic modes, where light is bound to a metal-dielectric interface, and surface plasmon polaritons (SPPs) in particular, are known for their high field confinement and enhancements. Hence these modes are attractive candidates to increase...
We demonstrate a silicon optical switch that can reroute optical signals within a switching time of just 3 ps. The switch is based on photonic crystal waveguides in a directional coupler geometry. The dispersion of the device has been engineered to provide slow-light enhancement, which allows the switching length of the device to be just 5 mum. The 3 ps switching time is demonstrated using free-carriers...
Diffracted waves are widespread in nature. They can be generated by the scattering with disordered and/or ordered system. Topological defects, such as phase dislocations or polarization singularities, can be hidden in complicated field pattern that arises from this multiple scattering. Photonic crystals owe their peculiar optical properties from the interference that emerges from the diffraction of...
The polarization above a photonics crystal structure is highly dependent on position to extent that the field even contains polarization singularities. When a nanophotonic structure is used to slow the light down, the concomitant increase in the light-matter interaction leads to a transition at a certain group velocity from a regime where imperfections can be considered as a minor perturbation to...
A chain of subwavelength sized holes in a gold film is used to launch surface plasmon polaritons. We investigate how the field pattern close to the chain evolves into diffraction orders in the far field. SPP are a powerful tool in the quest to build optical components at the nanoscale.
We measure the in-plane electric field above a photonic crystal waveguide with a polarization- and phase-sensitive near-field microscope. We find polarization singularities and study the topology of the surrounding electric field at the nanoscale.
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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