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We present a Stokes nanopolarimeter based on spin-orbit interaction of light that allows the instantaneous, non-destructive and local measurement of the polarization of light that impinges on it. The system consists of a subwavelength scatterer placed in close proximity to a multimode waveguide, so that the incoming polarization is mapped into amplitudes of the propagating modes. We also show that...
A gold nanostrip acting as a plasmonic nanoantenna is embedded into a gap created in a silicon waveguide to ensure maximum interaction between the guided field and the nanoantenna. We study numerically this system and demonstrate experimentally at telecom wavelengths that contrast beyond 10 dB can be achieved in transmission, opening a route for the efficient use of nanoantennas in silicon photonics...
In this communication, we present strategies to implement novel or enhanced optoelectronic functionalities on silicon via the monolithic integration of functional oxides as active layers for nanophotonic devices. We focus on the use of ferroelectric oxides with naturally strong electro-optical coefficients such as BaTiO3 (BTO) on SOI for the realization of electro-optical modulators around 1.55 µm...
The integration of active materials on silicon is emerging as a promising field in silicon photonics to improve the performance metrics of key photonic components, in particular active components. Active materials allow tuning their optical properties as function of external stimuli. Amongst them, vanadium dioxide (VO2) has been largely investigated for different applications due to its controllable...
We report on a novel and efficient strategy that can drive a mechanical mode into the lasing regime by exploiting the radiation pressure force in optomechanical (OM) cavities. The pumping mechanism is based on a self-pulsing limit-cycle, which is a spontaneous process that modulates the intracavity radiation pressure force in resonance with a mechanical eigenmode of the OM cavity.
Beam polarimetry is a versatile tool in optical technology enabling the measurement of the light polarization state. In this work, we demonstrate an on-chip polarization analyzer working at telecom wavelengths that allows for a direct measurement of the Stokes parameters of an incoming plane wave. The analyzer consists of three silicon nanoantennas coupled to three waveguides (having six outputs)...
An ultra-low power 2×2 photonic switch based on VO2/Si technology is proposed. The switch structure consists of an add-drop ring resonator with a footprint below 50 µm2. The waveguide structure is based on a fully etched silicon waveguide with a VO2 film on top of it. Electro-optical switching is achieved by means of the metal-insulator-transition (MIT) that can be induced in VO2. This MIT provides...
We present design and fabrication of a slot waveguide BaTiO3/Si Mach-Zehnder modulator. Modelling results based on anisotropic finite-difference mode solver show variation of effective index of 1.57×10−3 and a Vπ·L of 0.98 V·cm.
We report an experimental demonstration of single-strand DNA detection at room temperature using a photonic crystal waveguide based optical sensor. A detection limit of 19.8nM is obtained.
We present experimental measurements of the group index in tailored silicon corrugated waveguides. Nearly constant group index as high as ng=14 ±0.5 in a 13 nm range was measured in a 50 µm long waveguide.
We report design, fabrication and measurements of a compact and broadband planar polarization splitter in SOI technology. The device is smaller than 5 mum with a measured polarization crosstalk up to 10 dB in a wavelength bandwidth higher than 30 nm.
Efficient packaging in silicon photonics requires a previous development of high performance fiber coupling structures. One of the most suitable fiber coupling structures in silicon is the grating coupler. Main advantages of using such a vertical coupling technique with respect to horizontal techniques are fiber alignment tolerances and wafer scale testing. We report design, fabrication and experimental...
We report the simulation, fabrication and characterization of a new architecture of a 90deg phase shifter of QAM-QPSK photonic vectorial modulators and demodulators based on ring resonators. The structure was fabricated with SOI technology and the ring resonator parameters were calculated and optimized for WDM specifications using a mathematic simulator. Futhermore this circuit was characterized by...
The experimental demonstration of a high efficiency silicon nitride grating coupler is reported for wavelengths from lambda = 1.25 to 1.45 mum for TE polarization. At the resonant angle, a coupling efficiency higher than 60% has been measured.
Low crosstalk losses in silicon-on-insulator (SOI) waveguides are demonstrated. The proposed crossing structure has a high compactness, a broad bandwidth with almost flat transmission losses and constant crosstalk losses and is robust against fabrication inaccuracies.
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