A5077297843- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Photonic Crystals and Applications
- Optical Network Technologies
- Advanced Fiber Laser Technologies
- Optical Coatings and Gratings
- Advanced Fiber Optic Sensors
- Advanced Photonic Communication Systems
- Mechanical and Optical Resonators
- Semiconductor Quantum Structures and Devices
- Plasmonic and Surface Plasmon Research
- Magneto-Optical Properties and Applications
- Nanofabrication and Lithography Techniques
- Gold and Silver Nanoparticles Synthesis and Applications
- Silicon Nanostructures and Photoluminescence
- Neural Networks and Reservoir Computing
- Advanced MEMS and NEMS Technologies
- Analytical Chemistry and Sensors
- Laser Material Processing Techniques
- Advanced biosensing and bioanalysis techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Surface Polishing Techniques
- Cardiovascular Health and Disease Prevention
- Semiconductor materials and devices
- Spectroscopy and Laser Applications
Ghent University
2015-2024
IMEC
2007-2024
Ghent University Hospital
2008-2023
Imec the Netherlands
2001-2022
Photonics (United States)
2017-2021
Institute of Electrical and Electronics Engineers
2018
Instituto de Desarrollo Tecnológico para la Industria Química
2015-2017
IBM Research - Thomas J. Watson Research Center
2014
Princeton University
2014
Karlsruhe Institute of Technology
2013
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...
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...
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.
A compact, electrically driven light source integrated on silicon is a key component for large-scale integration of electronic and photonic circuits. Here we demonstrate injected continuous-wave lasing in InP-based microdisk lasers coupled to sub-micron wire waveguide, fabricated through heterogeneous InP silicon-on-insulator (SOI). The has diameter 7.5 mum thickness 1 mum. tunnel junction was incorporated efficiently contact the p-side pn-junction. laser emits at 1.6 mum, with threshold...
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.
We present high-efficiency grating couplers for coupling between a single-mode fiber and nanophotonic waveguides, fabricated both in silicon-on-insulator (SOI) InP membranes using BenzoCycloButene wafer bonding. The efficiency is substantially increased by adding gold bottom mirror to the structures. measured 69% SOI 56% bonded membrane
Optical phased arrays are versatile components enabling rapid and precise beam steering. An integrated approach is followed in which a 1D optical array fabricated on silicon-on-insulator. The consists of 16 parallel grating couplers spaced 2 mum apart. Steering one direction done thermo-optically by means titanium electrode top the structure using principle, while steering other accomplished wavelength tuning. At 1550 nm, continuous thermo-optical 2.3 degrees 14.1 reported.
We present a number of compact wavelength-selective elements implemented in silicon-on-insulator (SOI) photonic wires. These include arrayed waveguide gratings (AWGs), Mach-Zehnder lattice filters (MZLFs), and ring resonators. The circuits were fabricated with deep UV lithography. also address the sensitivity wires to phase noise by selectively broadening waveguides, demonstrate this AWG -20 dB crosstalk an insertion loss 2.2 for center channels
We present compact crossings for silicon-on-insulator photonic wires. The waveguides are broadened using a 3 microm parabolic taper in each arm. By locally applying lower index contrast double-etch technique, loss of confinement is reduced and 97.5% transmission (-1.7 dB) achieved with only -40 dB cross talk.
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...
Athermal silicon ring resonators are experimentally demonstrated by overlaying a polymer cladding on narrowed wires.The ideal width to achieve athermal condition for the TE mode of 220nm-height SOI waveguides is found be around 350nm.After layer, wavelength temperature dependence resonator reduced less than 5 pm/°C, almost eleven times that normal waveguides.The optical loss 350-nm bent waveguide (with radius 15µm) extracted from transmission spectrum.The scattering an acceptable level about...
PECVD silicon nitride photonic wire waveguides have been fabricated in a CMOS pilot line. Both clad and unclad single mode were measured at λ = 532, 780, 900 nm, respectively. The dependence of loss on width, wavelength, cladding is discussed detail. Cladded multimode singlemode show well below 1 dB/cm the 532-900 nm wavelength range. For waveguides, losses achieved whereas range 1-3 for 780 532
We demonstrate an octave-spanning frequency comb with a spectrum covering wavelengths from 1,540 nm up to 3,200 nm. The supercontinuum is generated by pumping 1-cm long dispersion engineered silicon wire waveguide 70 fs pulses energy of merely 15 pJ. confirm the phase coherence output beating narrow bandwidth CW lasers. show that experimental results are in agreement numerical simulations.
Silicon does not emit light efficiently, therefore the integration of other light‐emitting materials is highly demanded for silicon photonic integrated circuits. A number approaches have been extensively explored in past decade. Here, most recent progress this field reviewed, covering III‐V‐to‐silicon bonding, transfer printing, epitaxial growth and use colloidal quantum dots. The basic to create waveguide‐coupled on‐chip sources different application scenarios are discussed, both nitride...
Radio-frequency communication systems have long used bulk- and surface-acoustic-wave devices supporting ultrasonic mechanical waves to manipulate sense signals. These greatly improved our ability process microwaves by interfacing them orders-of-magnitude slower lower loss fields. In parallel, long-distance communications been dominated low-loss infrared optical photons. As electrical signal processing transmission approaches physical limits imposed energy dissipation, links are now being...
We demonstrate a novel polarization splitter based on two-dimensional grating etched in silicon-on-insulator waveguide. The device couples orthogonal modes from single-mode optical fiber into identical of two planar ridge waveguides. extinction ratio is better than 18 dB the wavelength range 1530-1560 nm and coupling efficiency approximately 20%. very compact light only to transverse-electric Therefore, it may be used diversity configuration implement insensitive photonic integrated circuit crystal
A high efficiency broadband grating coupler for Silicon-On-Insulator waveguides was designed. The is defined by locally adding a poly-Silicon layer on top of the existing waveguide structure prior to etching. Adding this reshapes which changes its diffraction properties. Coupling efficiencies as 78% at wavelength 1.55 mum are calculated and optical 3dB bandwidth device about 85 nm. layout compatible with standard CMOS technology processing.
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 report experimental results on compact and broadband focusing grating couplers, both in silicon-on-insulator (SOI) gold SOI. An eight-fold length reduction of the coupling structure from fiber to photonic wire SOI, as compared a linear adiabatic taper, is obtained, without performance penalty. A proof principle given for coupler with 20% fiber-to-focus efficiency.
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,...