Roel Baets

Investigation of evanescent coupling between SOI waveguides and heterogeneously-integrated III-V pin photodetectors (2009)

Sheng, Zhen, Liu, Liu, Brouckaert, Joost, He, SaiLing, Van Thourhout, Dries, Baets, Roel

Integrating III-V materials on Si is a promising candidate to realize both passive and active optical functions on a single silicon chip. We have developed this heterogeneous integration technology...

Fabrication of photonic wire and crystal circuits in silicon-on-insulator using 193-nm optical lithography (2009)

Selvaraja Shankar, Kumar, Patrick, Jaenen, Bogaerts, Wim, Van Thourhout, Dries, Dumon, Pieter, Baets, Roel

High-index contrast silicon-on-insulator technology enables wavelength-scale compact photonic circuits. We report fabrication of photonic circuits in silicon-on-insulator using complementary...

Silicon-on-insulator-based retroreflective optical marker chips for simultaneous identification and localization (2009)

Verbist, Marie, Bogaerts, Wim, Schrauwen, Jonathan, Baets, Roel

We demonstrate an omnidirectional, retroreflective optical marker in silicon on insulator that enables simultaneous identification and localization of objects. The most important chip requirement-its...

Tunable optical forces between nanophotonic waveguides (2009)

Roels, Joris, De Vlaminck, Iwijn, Lagae, Liesbet, Maes, Björn, Van Thourhout, Dries, Baets, Roel

The confinement of light in components with nanoscale cross-sections in nanophotonic circuits significantly enhances the magnitude of the optical forces experienced by these components(1,2). Here we...

Highly efficient grating coupler between optical fiber and silicon photonic circuit (2009)

Selvaraja Shankar, Kumar, Vermeulen, Diedrik, Schaekers, Marc, Sleeckx, Erik, Bogaerts, Wim, Roelkens, Günther, ...

We report on a highly efficient grating coupler between an optical fiber and a silicon photonic circuit. Using layers of Si/SiO2 as a Bragg mirror and amorphous Si we have measured a coupling...

A noncontact approach for the evaluation of large artery stiffness: a preliminary study (2008)

De Melis, Mirko, Morbiducci, Umberto, Scalise, Lorenzo, Tomasini, Enrico, Delbeke, Danae, Baets, Roel, ...

BACKGROUND The time from carotid to femoral pulse wave propagation (pulse transit time (PTT)) is required to estimate the carotid-femoral pulse wave velocity (PWV), a reliable index for evaluating...

Tristable all-optical flip-flop using coupled nonlinear cavities (2008)

Huybrechts, Koen, Maes, Björn, Morthier, Geert, Baets, Roel

We demonstrate symmetry breaking in a multistable system composed of three coupled nonlinear cavities. Using positive pulses it is possible to switch between the asymmetric states, thus resulting in...

Flexible metal grating based optical fiber probe for photonic integrated circuits (2008)

Scheerlinck, Stijn, Taillaert, Dirk, Van Thourhout, Dries, Baets, Roel

An optical probe for photonic integrated circuits is proposed and demonstrated. The device is based on a single-mode fiber containing a subwavelength period metal grating on the facet. When...

Proposal for an all-optical flip-flop using a single distributed feedback laser diode (2008)

Huybrechts, Koen, D'Oosterlinck, Wouter, Morthier, Geert, Baets, Roel

We introduce a new concept for an all-optical flip-flop based on a single distributed feedback laser. The injection of external light into the laser results in a nonuniform carrier distribution. We...

Planar concave grating demultiplexer with high reflective bragg reflector facets (2008)

Brouckaert, Joost, Bogaerts, Wim, Selvaraja Shankar, Kumar, Dumon, Pieter, Baets, Roel, Van Thourhout, Dries

We present measurement results of an ultracompact four-channel silicon-on-insulator planar concave grating demultiplexer fabricated in a complimentary metal-oxide-semiconductor line using...

Nested-ring Mach-Zehnder interferometer in silicon-on-insulator (2008)

Darmawan, S, Landobasa, YM, Dumon, Pieter, Baets, Roel, Chin, MK

For the first time, a nested-ring Mach-Zehnder interferometer (MZI) on silicon-on-insulator is realized using a complementary metal-oxide-semiconductor-based process. In this letter, we verify that...

The transmission properties of one-bus two-ring devices (2008)

Tobing, Landobasa YMAL, Dumon, Pieter, Baets, Roel, Lim, Desmond CS, Chin, Mee-Koy

We propose and demonstrate a simple one-bus two-ring configuration where the two rings are mutually coupled that has advantages over the one-ring structure. Unlike a one cavity system, it can exhibit...

Design and optimization of electrically injected InP-based microdisk lasers integrated on and coupled to a SOI waveguide circuit (2008)

Van Campenhout, Joris, Rojo-Romeo, Pedro, Van Thourhout, Dries, Seassal, Christian, Regreny, Philippe, Di Cioccio, Lea, ...

We have performed a numerical study involving the design and optimization of InP-based microdisk lasers integrated on and coupled to a nanophotonic silicon-on-insulator (SOI) waveguide circuit,...

A compact SOI-integrated multiwavelength laser source based on cascaded InP mircrodisks (2008)

Van Campenhout, Joris, Liu, Liu, Rojo-Romeo, Pedro, Van Thourhout, Dries, Seassal, Christian, Regreny, Philippe, ...

We report on the performance of a compact multiwavelength laser (MWL) source heterogeneously integrated with and coupled to a silicon-on-insulator (SOI) waveguide circuit. The MWL consists of four...

Efficient polarization diversity grating couplers in bonded InP-membrane (2008)

Van Laere, Frederik, Stomeo, Tiziana, Taillaert, Dirk, Roelkens, Günther, Van Thourhout, Dries, Krauss, Thomas F, ...

We report on the design, fabrication, and measurement of compact and efficient grating couplers between fiber and nanophotonic waveguides, in a polarization diversity configuration. This approach...

Electrically injected InP microdisk lasers integrated with nanophotonic SOI circuits (2008)

Van Campenhout, Joris, Rojo-Romeo, P, Regreny, P, Seassal, C, Van Thourhout, Dries, Di Cioccio, L, ...

We have achieved continuous-wave electrically-injected lasing operation at room-temperature in InP-based microdisks heterogeneously integrated on a SOI nanophotonic circuit. The microdisks were...

Coupling mechanisms for a heterogeneous silicon nanowire platform (2008)

Van Thourhout, Dries, Roelkens, Günther, Baets, Roel, Bogaerts, Wim, Brouckaert, Joost, Debackere, Peter, ...

We discuss different mechanisms for coupling light from nanophotonic silicon waveguides to different types of materials added on top of these waveguides for enhancing the functionality of these...

Silicon-organic hybrid (SOH) devices for nonlinear optical signal processing (2008)

Freude, W, Brosi, J-M, Koos, C, Vorreau, P, Andreani, LC, Dumon, Pieter, ...

Silicon-on-insulator (SOI) is a promising material system for dense on-chip integration of both silicon photonic and electronic devices. The high refractive index of silicon enables strong light...

Label-free biosensors on silicon-on-insulator optical chips based on microring cavities and surface plasmon interferometry (2008)

De Vos, Katrien, Debackere, Peter, Baets, Roel, Bienstman, Peter

To come LIP to the demand for extremely sensitive biosensors for parallel real-time bioanalyses, we present two configurations of label-free biosensors on Silicon-on-Insulator optical chips. We...

Modeling comparison of second-harmonic generation in high-index-contrast devices (2008)

Maes, Björn, Bienstman, Peter, Baets, Roel, Hu, Bobo, Sewell, Phillip, Benson, Trevor

In this paper we model second-harmonic generation in a microphotonic structure using two different numerical methods. The proposed two-dimensional waveguide device is challenging as it incorporates a...

A preliminary study for the evaluation of large artery stiffness: a non contact approach (2008)

De Melis, Mirko, Morbiducci, Umberto, Scalise, Lorenzo, Tomasini, Enrico, Delbeke, Danae, Baets, Roel, ...

The evaluation of carotid-to-femoral pulse transit time (PTT) is required to estimate the carotid-femoral pulse wave velocity, a parameter considered as the gold standard for the quantification of...

Photonic reservoir computing with coupled semiconductor optical amplifiers (2008)

Vandoorne, Kristof, Dierckx, Wouter, Schrauwen, Benjamin, Verstraeten, David, Bienstman, Peter, Baets, Roel, ...

We propose photonic reservoir computing as a new approach to optical signal processing and it can be used to handle for example large scale pattern recognition. Reservoir computing is a new learning...

III-V silicon heterogeneous integration for integrated transmitters and receivers (2008)

Van Thourhout, Dries, Van Campenhout, Joris, Roelkens, Günther, Brouckaert, Joost, Baets, Roel

Silicon is excellent material for realizing compact nanophotonic ICs operating at wavelengths in the telecom range. Moreover, the desired circuits can be realized with the most advanced equipment...

A dynamic subwavelength pitch grating modulator for continuous time-of-flight ranging with optical mixing (2008)

Roels, Joris, Van Nieuwenhove, D, Grootjans, R, Kuijk, M, Van Thourhout, Dries, ...

Since continuous Time-Of-Flight ranging systems based on electrical mixing run into fundamental limits we designed an optical MEMS (de)modulator/mixer. With our dynamic (MHz range) subwavelength...

Focusing polarization diversity gratings for silicon-on-insulator integrated circuits (2008)

Van Laere, Frederik, Bogaerts, Wim, Dumon, Pieter, Roelkens, Günther, Van Thourhout, Dries, Baets, Roel

We present experimental results for focusing grating couplers for coupling between optical fiber and nanophotonic Silicon-on-Insulator waveguides in polarization diversity configuration. The...

Box-like filter response of two-dimensional array of microring resonator fabricated in silicon-on-insulator technology (2008)

Tobing, Landobasa YM, Dumon, Pieter, Baets, Roel, Chin, Mee-Koy

We show theoretically and demonstrate experimentally that box-like response can be obtained using 2D arrays of microring resonator. The box-like response is manifested from the complementary photonic...

Defect modes in microring resonator arrays fabricated in silicon-on-insulator technology (2008)

Tobing, Landobasa YM, Dumon, Pieter, Baets, Roel, Chin, Mee-Koy

We show experimentatly the existence of defect modes in mutually coupled microring resonator array fabricated in silicon-on-insulator technology. The movements of donor-like and acceptor-like modes...

Compact integrated photonic crystal demultiplexer for emitting and receiving InP photonic integrated circuits (2008)

Benisty, H, Cambournac, C, Khayam, O, Ayre, M, Van Laere, Frederik, Van Thourhout, Dries, ...

Photonic-crystal-based demultiplexers, compact and versatile, are successfully used to demonstrate a polarisation-diversity receiving InP-based chip and a laser with integrated wavelength monitor....

Highly nonlinear silicon photonics slot waveguides without free carrier absorption related speed-limitations (2008)

Vallaitis, T, Koos, C, Esembeson, B, Biaggio, I, Michinobu, T, Diederich, F, ...

Nonlinear losses of highly nonlinear silicon/organic photonics slot waveguides are analyzed. Unlike silicon strip waveguides, slot waveguides do not show absorption related speed limitations up to...

Silicon-on-insulator nanophotonic waveguide circuit for fiber-to-the-home transceivers (2008)

Vermeulen, Diedrik, Roelkens, Günther, Brouckaert, Joost, Van Thourhout, Dries, Baets, Roel, Duijn, R, ...

We present a SOI nanophotonic waveguide circuit for FTTH transceivers. A grating duplexer and planar concave grating are combined to couple and demultiplex the 1310, 1490 and 1550nm communication...

Enhanced nonlinearity in SOI microcavities by III-V/SOI heterogeneous integration (2008)

Roelkens, Günther, Liu, Liu, Van Thourhout, Dries, Baets, Roel, Notzel, R, Raineri, F, ...

We demonstrate enhanced nonlinearity in an SOI microcavity by heterogeneously integrating a III-V overlay on top of the SOI waveguide layer. Nonlinear transmission and all-optical modulation is...

All-optical wavelength converter with InP micro-disk laser integrated on SOI (2008)

Liu, Liu, Van Campenhout, Joris, Roelkens, Günther, Van Thourhout, Dries, Rojo Romeo, Pedro, Regreny, Philippe, ...

An all-optical wavelength converter is demonstrated using an InP micro-disk laser on SOI. In this configuration, no extra probe beam is needed. The control power is as low as several micro-watts.

Compact silicon-on-insulator wavelength demultiplexer with heterogeneously integrated InAIAs/InGaAs photodetectors (2008)

Brouckaert, Joost, Roelkens, Günther, Selvaraja Shankar, Kumar, Bogaerts, Wim, Dumon, Pieter, Verstuyft, Steven, ...

We present experimental results of a 4-channel demultiplexer with integrated photodetectors. The device consists of a silicon-on-insulator planar concave grating demultiplexer and heterogeneously...

Fast operation of a broadband all-optical flip-flop based on a single DFB-laser diode (2008)

Huybrechts, Koen, Morthier, Geert, Baets, Roel

We demonstrate an all-optical flip-flop based on a single DFB-laser diode with repetition rates up to 2 GHz, set/reset-pulses of 7 ps and 200 fJ, a switch-on time of 75 ps and a switch-off time below...

Short polarization filter in pillar-based photonic crystals (2008)

Kok, Abigael AM, Geluk, Erik Jan, Karouta, Fouad, Van Der Tol, Jos JGM, Baets, Roel, Smit, Meint K

The strong polarization dependence of two-dimensional photonic crystals is exploited for polarization filtering. The device with a length of 3.9 mu m is integrated in a photonic integrated circuit...

Resonance enhancement in silicon-on-insulator-based two-ring mach-zehnder interferometer (2008)

Darmawan, S, Landobasa, YM, Dumon, Pieter, Baets, Roel, Chin, MK

We propose and demonstrate a two-ring coupled Mach-Zehnder interferometer (2RMZI) device that exhibits a sharp resonance with background suppression to give both high finesse and modulation depth....

Focused-ion-beam fabrication of slots in silicon waveguides and ring resonators (2008)

Schrauwen, Jonathan, Van Lysebettens, Jeroen, Claes, Tom, De Vos, Katrien, Bienstman, Peter, Van Thourhout, Dries, ...

We present the focused-ion-beam fabrication of slots in existing silicon waveguides and racetrack resonators. The etch process was conducted with iodine enhancement and an alumina hard mask. We...

Continuous time-of-flight ranging using a MEMS diffractive subwavelength period grating (de)modulator (2008)

Roels, Joris, Van Der Tempel, Ward, Van Nieuwenhove, Daniël, Grootjans, Riemer, Kuijk, Maarten, Van Thourhout, Dries, ...

We present a time-of-flight (TOF) ranging experiment based on optical mixing. The key component in this experiment is the optical (de)modulator. Consequently we also report on the design,...

Silicon nanophotonic waveguide circuits and devices (2008)

Bogaerts, Wim, Dumon, Pieter, Selvaraja Shankar, Kumar, Van Thourhout, Dries, Baets, Roel

Silicon on Insulator is an ideal platform for largescale nanophotonic integration. We show that tight process control is needed for well-functioning filters, and discuss a number of devices based on...

The Transmission Properties of One-Bus Two-Ring Devices (2008)

DUMON, Pieter, BAETS, Roel, LIM, Desmond. C.S., CHIN, Mee-Koy

We propose and demonstrate a simple one-bus two-ring configuration where the two rings are mutually coupled that has advantages over the one-ring structure. Unlike a one cavity system, it can exhibit...

Demonstration of optical via and low-loss optical crossing for vertical integration Of silicon photonic circuits (2008)

Selvaraja Shankar, Kumar, Dumon, Pieter, Sleeckx, Erik, Schaekers, Marc, Bogaerts, Wim, Van Thourhout, Dries, ...

We demonstrate optical via and ultralow-loss optical crossing in dual layer silicon photonic circuit. We have achieved crossing loss as low as 0.013± 0.0024 dB/crossing. By employing shallow etched...

Study of a magnetooptic contact for an amplifying waveguide optical isolator (2007)

Vanwolleghem, Mathias, Van Thourhout, Dries, Baets, Roel, Lelarge, Francois, Thedrez, Bruno, ...

We report on the development of an ohmic metal-semiconductor contact for application in an amplifying wavegulde optical isolator. It is the result of magnetooptic waveguide simulations combined with...

Design and realization of an optical switch based on long-range surface plasmon polaritons and liquid crystal (2007)

De Cort, Wout, Desmet, Hans, Scheerlinck, Stijn, Neyts, Kristiaan, Baets, Roel

We show switching of the output power in a system based on plasmonics and liquid crystal. This switching is caused by a change in temperature.

A silicon laser with gain in doped liquid crystal (2007)

De Cort, Wout, Neyts, Kristiaan, Baets, Roel

For years, researchers have been looking for an efficient laser based on silicon. Such a device would have numerous applications and its development would be a huge step towards all optical...

Light extraction for a doubly resonant cavity organic LED: the RC2LED (2007)

Vandersteegen, Peter, Mladenovski, Saso, Van Elsbergen, Volker, Gartner, Georg, Bienstman, Peter, Neyts, Kristiaan, ...

The RC2LED is a substrate emitting OLED which has three additional interference layers between the ITO electrode and the glass substrate. This creates two resonant optical cavities. The RC2LED has 2...

Modelling gratings on either side of the substrate for light extraction in light-emitting diodes (2007)

Bienstman, Peter, Vandersteegen, Peter, Baets, Roel

We present a three-dimensional model based on rigorous coupled wave analysis (RCWA) which allows us to study the influence of periodic structures on light extraction in light-emitting diodes. The...