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Third-order nonlinear optical phenomena have been intensively studied in integrated structures of crystalline silicon, Hydex, and silicon nitride for different applications, from classical to quantum photonics. As any other material, also porous silicon PSi is characterized by a third-order nonlinear response. Previous works have focused mainly on third-harmonic generation or two-photon absorption...
In this paper, we report our recent results about slotted photonic structures for hybrid on-chip integration in silicon photonics. Explored schemes cover hollow core waveguide optimized micro-ring resonators, slot photonic crystal cavities, and slow light slotted waveguides, all aiming at the enhancement of light-matter interactions. A comparison between several of these approaches is drawn regarding...
Metamaterial surfaces in the shape of Split Ring Resonators, Asymmetric Split Ring Resonators and H-shaped structures have been used as optical sensors for organic materials such PMMA and the hormone estradiol. Field enhancement by the plasmonic structures can be obtained by matching the wavelength of the structures plasmonic resonance with a molecular resonance of a specific analyte and results in...
A rigorous mathematical method to simulate an ultra-high Q-factor 1D PhC ring resonator (1D PhCRR) is proposed. The integration of a 1D PhC in a ring cavity resonator allows an enhancement of the Q-factor of a single ring resonator up to 109 or more, without enlarging the device footprint, with an improvement of at least two orders of magnitude in comparison with the values obtained without the grating...
Creation of miniature optical delay lines and buffers is one of the greatest challenges of the modern photonics which can revolutionize optical communications and computing. Several remarkable designs of slow light optical delay lines employing coupled ring resonators and photonic crystal waveguides has been suggested and experimentally demonstrated. However, the insertion loss of these devices is...
In the last few years, the interest towards chip-scale microphotonic resonant label-free biosensor is quickly growing. In this context, novel low-cost platforms able to simultaneously detect, with high resolution, several target molecules in an ultra-small volume of biologic fluid are strongly demanded. In this paper, the recent advances in the field of resonant microphotonic platforms for label-free...
The arrival of the Single-Atom Transistor (SAT) in 2004, a quantum device operated at room temperature, allowed for the first controlled switching of an electrical current by the reproducible relocation of one single metal atom [1]. At the same time this component established the feasibility of transistors completely made of metals. Meanwhile, many experiments have followed, demonstrating the control...
We propose and analyse two novel mesh design geometries, the hexagonal and the triangular lattice, for the implementation of tunable optical cores in programmable photonic processors and universal couplers. They are compared to a previously proposed square mesh topology in terms of a series of figures of merit that account for metrics that are relevant to on-chip integration of the mesh finding that...
This paper presents a novel design of a “Sensor on a Chip” spectrometer, based on silicon on silica (SOI) material. It employs a series of silicon micro-ring resonators with varied diameters whose resonance wavelengths evenly space out across the CO2 emission spectrum range. This provides a resonators-based detection platform for the observation of the Earth's atmospheric CO2 levels, as well as for...
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