Reservoir computing using a delayed feedback system: towards photonic implementations

Delayed feedback systems are known to exhibit a rich dynamical behavior, showing a wide variety of dynamical regimes. We use this richness to implement reservoir computing, a processing concept in machine learning. In this paper we demonstrate the proof of principle on an electronic system, however the approach is readily transferable to photonics, promising fast and computationally efficient all-optical processing. Using only one single node with delayed feedback instead of an entire network of nodes, we succeed in obtaining state-of-the-art results on benchmarks such as spoken digit recognition and system identification

Improved-index-contrast KY(WO4)2:Gd, Lu, Yb epitaxial waveguides suitable for highly efficient waveguide lasing

High-quality crystalline KY(WO4)2:Yb3+ layers co-doped with large concentrations of optically inert Gd3+ and Lu3+ ions were grown by vertical liquid phase epitaxy. The codoping enhances the refractive index contrast between the active layer and the undoped KY(WO4)2 substrate to ~7.5×10-3. A K2W2O7 solvent was employed for the growth of layers onto undoped (010)-oriented KYW substrates. Single crystalline layers of thickness 5-10 µm were grown at low level of supersaturation and growth temperatures of 920-923°C. The layer quality was studied by X-ray diffraction. The composition of the grown layers was determined by laser-ablation inductively-coupled-plasma mass spectrometry (LA-ICP-MS). Planar waveguide lasers with low laser threshold of 18 mW, record-high slope efficiency of 82.3%, and maximum output power of 195 mW have been achieved

Label-free Enzyme Sensing with Grated Silicon Photonic Wire

We have investigated the label-free biosensing properties of grated silicon photonic wire (GSPW) waveguides with cross-sectional dimensions of 350 nm x 220 nm, fabricated using a 248-nm deep UV lithography process. The steep edges of the optical transmission spectrum of the GSPW enable detection of very small spectral shift, hence of small index changes. To obtain an antibody layer for the biosensing experiment, an immobilization process is required. We followed the standard immobilization process developed by Imenz B.V. The antibody immobilization process and the binding process of enzymes on an immobilized antibody layer have been monitored with the GSPW based sensor

Neodymium-complex-doped steady-state polymer waveguide lasers

Channel waveguides based on a polymer, 6-fluorinated-dianhydride/epoxy, which is actively doped with a rare-earth-ion-doped complex, Nd(thenoyltrifluoroacetone)3 1,10-phenanthroline, have been fabricated. Luminescence and loss spectra of the channel waveguides have been experimentally investigated. By optimization of the fabrication procedure of both, host material and optical structure, steady-state laser emission has been demonstrated from a channel waveguide near 1060 nm, which provides up to 440 µW of output power from the waveguide structures developed

Reservoir computing using a delayed feedback system: towards photonic implementations

Delayed feedback systems are known to exhibit a rich dynamical behavior, showing a wide variety of dynamical regimes. We use this richness to implement reservoir computing, a processing concept in machine learning. In this paper we demonstrate the proof of principle on an electronic system, however the approach is readily transferable to photonics, promising fast and computationally efficient all-optical processing. Using only one single node with delayed feedback instead of an entire network of nodes, we succeed in obtaining state-of-the-art results on benchmarks such as spoken digit recognition and system identification.info:eu-repo/semantics/publishe

DNA Separation and Fluorescence Monitoring by Integrated Waveguides in an Optofluidic Chip

We report on the monolithic integration of optical waveguides and microfluidics in a fused-silica lab-on-a-chip. Labeled biomolecules such as double-stranded DNA are flown and separated in the microfluidic channel by capillary electrophoresis and their fluorescent labels are excited by a continuous-wave laser beam through femtosecondlaser-written integrated waveguides. In this context, desirable features such as high spatial resolution (~12 μm), and a low limit of detection (~ 6 nano-molar) have been experimentally demonstrated. The proof of concept is being extended to real-world diagnostic samples for on-chip diagnosis of genetic diseases, e.g. breast cancer