A5067665186- Photonic and Optical Devices
- Neural Networks and Reservoir Computing
- Photonic Crystals and Applications
- Optical Network Technologies
- Advanced Memory and Neural Computing
- Optical Coatings and Gratings
- Mechanical and Optical Resonators
- Advanced Fiber Optic Sensors
- Semiconductor Lasers and Optical Devices
- Plasmonic and Surface Plasmon Research
- Advanced Fiber Laser Technologies
- Electromagnetic Simulation and Numerical Methods
- Advanced MEMS and NEMS Technologies
- Nanofabrication and Lithography Techniques
- Neural Networks and Applications
- Thin-Film Transistor Technologies
- Advanced Biosensing Techniques and Applications
- Analytical Chemistry and Sensors
- Organic Electronics and Photovoltaics
- Molecular Junctions and Nanostructures
- Neural dynamics and brain function
- Nonlinear Photonic Systems
- Advanced Photonic Communication Systems
- Electromagnetic Scattering and Analysis
- Microfluidic and Bio-sensing Technologies
Ghent University
2016-2025
IMEC
2003-2024
Vrije Universiteit Brussel
2024
University of Oxford
2023
Photonics (United States)
2014-2023
Imec the Netherlands
2008-2023
Re/genT (Netherlands)
2016
Ghent University Hospital
2003-2015
Integrated Optoelectronics (Norway)
2012
Universitat de València
2010
Abstract An overview is presented of the current state‐of‐the‐art in silicon nanophotonic ring resonators. Basic theory resonators discussed, and applied to peculiarities submicron photonic wire waveguides: small dimensions tight bend radii, sensitivity perturbations boundary conditions fabrication processes. Theory compared quantitative measurements. Finally, several more promising applications are discussed: filters optical delay lines, label‐free biosensors, active rings for efficient...
High-index-contrast, wavelength-scale structures are key to ultracompact integration of photonic integrated circuits. The fabrication these nanophotonic in silicon-on-insulator using complementary metal-oxide-semiconductor processing techniques, including deep ultraviolet lithography, was studied. It is concluded that this technology capable commercially manufacturing possibilities wires and photonic-crystal waveguides for compared. shown that, with similar perform at least an order...
Label-free biosensors attempt to overcome the stability and reliability problems of relying on detection labeled molecules. We propose a label-free biosensor based microring cavities in Silicon-on-Insulator (SOI) that fits an area below 10x10mum(2). The resonance wavelength shift occurs when surroundings cavity is changed, used for sensing. While theoretically performance bulk refractive index changes moderate (10(-5)), this device performs outstanding terms absolute molecular mass sensing...
In today's age, companies employ machine learning to extract information from large quantities of data. One those techniques, reservoir computing (RC), is a decade old and has achieved state-of-the-art performance for processing sequential Dedicated hardware realizations RC could enable speed gains power savings. Here we propose the first integrated passive silicon photonics reservoir. We demonstrate experimentally through simulations that, thanks paradigm, this generic chip can be used...
Nanophotonic waveguides and components are promising for use in the large-scale integration of photonic circuits. Coupling light between nanophotonic a single-mode fiber is an important problem many different solutions have been proposed demonstrated recent years. In this paper, we discuss grating coupler approach. Grating couplers can be placed anywhere on circuit easily integrated. We experimentally >30% coupling efficiency with 1 dB bandwidth 40 nm standard wafers. Theoretically, improved...
We have designed and fabricated an out-of-plane coupler for butt-coupling from fiber to compact planar waveguides. The is based on a short second-order grating or photonic crystal, etched in waveguide with low-index oxide cladding. optimized using mode expansion-based simulations. Simulations 2-D model show that up 74% coupling efficiency between single-mode 240-nm-thick GaAs-AlO/sub x/ possible. measured 19% test structures.
We have designed a high-efficiency broadband grating coupler for coupling between silicon-on-insulator (SOI) waveguides and optical fibers. The is only 13 µm long 12 wide, the size of grooves optimized numerically. For TE polarization loss to single-mode fiber below 1 dB over 35-nm wavelength range when using SOI with two-pair bottom reflector. tolerances fabrication errors are also calculated.
We demonstrate single-mode photonic wires in silicon-on-insulator with propagation loss as low 2.4 dB/cm, fabricated deep ultraviolet lithography and dry etching. have also made compact racetrack ring resonators functioning add-drop filters, attaining Q values larger than 3000 crosstalk.
We present a slot-waveguide-based ring resonator in silicon on insulator (SOI) with footprint of only 13 m  10 m, fabricated optical lithography.Experiments show that it has 298 nm/RIU sensitivity and detection limit 4:2 Á À5 RIU for changes the refractive index top cladding.We prove first time surface chemistry selective label-free sensing proteins can be applied inside 100 nm-wide slot region demonstrate application waveguide instead normal increases an SOI factor 3.5 proteins.
The high index contrast silicon-on-insulator platform is the dominant CMOS compatible for photonic integration. successful use of silicon chips in optical communication applications has now paved way new areas where can be applied. It already emerging as a competing technology sensing and spectroscopic applications. This increasing range photonics instigates an interest exploring materials, some drawbacks these applications, e.g., not transparent visible wavelength range. Silicon nitride...
We studied a refractive index sensor that consists of two cascaded ring resonators and works analogously to Vernier-scale. implemented it in silicon-on-insulator experimentally determined its sensitivity be as high 2169 nm/RIU aqueous environment. derived formulas describing the sensor's operation, introduced fitting procedure allows accurately detect changes response. detection limit this first prototype 8.310(-6)RIU.
There is a rapidly growing demand to use silicon and nitride (Si 3 N 4 ) integrated photonics for sensing applications, ranging from refractive index spectroscopic sensing.By making of advanced CMOS technology, complex miniaturized circuits can be easily realized on large scale at low cost covering visible mid-IR wavelengths.In this paper we present our recent work the development Si -based photonic various applications.We report findings waveguide-based absorption, Raman surface enhanced...
Abstract Advancements in optical coherence control 1–5 have unlocked many cutting-edge applications, including long-haul communication, light detection and ranging (LiDAR) tomography 6–8 . Prevailing wisdom suggests that using more coherent sources leads to enhanced system performance device functionalities 9–11 Our study introduces a photonic convolutional processing takes advantage of partially boost computing parallelism without substantially sacrificing accuracy, potentially enabling...
For the compact integration of photonic circuits, wavelength-scale structures with a high index contrast are key requirement. We developed fabrication process for these nanophotonic in Silicon-on-insulator using CMOS processing techniques based on deep UV lithography. have fabricated both wires and crystal waveguides show that, same technique, much less propagation loss than waveguides. Measurements losses 0.24dB/mm wires, 7.5dB/mm To tackle coupling to fiber, we studied vertical fiber...
We propose photonic reservoir computing as a new approach to optical signal processing in the context of large scale pattern recognition problems.Photonic is implementation recently proposed concept, where dynamics network nonlinear elements are exploited perform general tasks.In our implementation, we employ coupled Semiconductor Optical Amplifiers (SOA) basic building blocks for reservoir.Although they differ many key respects from traditional software-based hyperbolic tangent reservoirs,...
We prove that an adiabatic theorem generally holds for slow tapers in photonic crystals and other strongly grated waveguides with arbitrary index modulation, exactly as conventional waveguides. This provides a guaranteed pathway to efficient broad-bandwidth couplers with, e.g., uniform show transmission can only occur, however, if the operating mode is propagating (nonevanescent) guided at every point taper. Moreover, we demonstrate how straightforward taper designs violate these conditions,...
The influence of silver nanoparticles on light absorption in organic solar cells based poly(3-exylthiophene):(6,6)-phenyl-C61-butyric-acid-methyl ester is studied by means finite element method simulations. metallic are embedded directly inside the active layer. We investigate enhancement mechanism and factors such as spacing between neighboring nanoparticles, particle diameter, coating thickness. plasmonic resonance particles has a wideband absorption, we observe rich interaction...
Reservoir computing (RC), a computational paradigm inspired on neural systems, has become increasingly popular in recent years for solving variety of complex recognition and classification problems. Thus far, most implementations have been software-based, limiting their speed power efficiency. Integrated photonics offers the potential fast, efficient massively parallel hardware implementation. We previously proposed network coupled semiconductor optical amplifiers as an interesting test case...
Optical cavities are considered promising devices for biosensing to satisfy the high demands of growing proteomics market.We present a prototype sensor multiplexed label-free monitoring biomolecular interactions based on an array three-by-four silicon-oninsulator microring resonators fabricated by standard complementary metal-oxide semicondutor (CMOS) technology.Parallel readout was performed with infrared camera.We have demonstrated simultaneous detection several model antibodies in highly...
To emulate a spiking neuron, photonic component needs to be excitable. In this paper, we theoretically simulate and experimentally demonstrate cascadable excitability near self-pulsation regime in high-Q-factor silicon-on-insulator microrings. For the theoretical study use Coupled Mode Theory. While neglecting fast energy phase dynamics of cavity light, can still preserve most important microring dynamics, by only keeping temperature difference with surroundings amount free carriers as...
Silicon photonics typically builds on a silicon-on-insulator based high-index-contrast waveguide system. nitride provides an alternative moderate-index-contrast system that is manufacturable in the same CMOS environment. This paper discusses relative benefits of both platforms.
Reservoir computing is a recent bio-inspired approach for processing time-dependent signals.It has enabled breakthrough in analog information processing, with several experiments, both electronic and optical, demonstrating state-of-the-art performances hard tasks such as speech recognition, time series prediction nonlinear channel equalization.A proof-of-principle experiment using linear optical circuit on photonic chip to process digital signals was recently reported.Here we present...
Abstract Silicon microring resonators very often exhibit resonance splitting due to backscattering. This effect is hard quantitatively and predicatively model. paper presents a behavioral circuit model for microrings that explains the wide variations in observed experiments. The based on an in‐depth analysis of contributions backscattering by both waveguides couplers. Backscattering transforms unidirectional into bidirectional circuits coupling clockwise counterclockwise circulating modes....