Roel Baets
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View article: Numerical and Experimental Methods for Estimating the Propagation Loss in Microphotonic Waveguides
Numerical and Experimental Methods for Estimating the Propagation Loss in Microphotonic Waveguides Open
The accurate estimation of propagation loss in microphotonic waveguides is a crucial factor in the performance optimization of photonic integrated circuits. This article presents a comprehensive review of both numerical and experimental me…
View article: Sensing of ceftazidime antibiotics in human plasma through waveguide-enhanced Raman spectroscopy assisted by a mesoporous layer
Sensing of ceftazidime antibiotics in human plasma through waveguide-enhanced Raman spectroscopy assisted by a mesoporous layer Open
We report, to the best of our knowledge, the first Raman sensor for antibiotics spiked in human plasma using silicon nitride waveguides functionalized with a mesoporous silica top-cladding. Leveraging waveguiding signal enhancement, chemic…
View article: Broadband, High Resolution, Sensitive Spectrometer Using an Integrated Optical Phased Array in Silicon Nitride and Fourier Imaging
Broadband, High Resolution, Sensitive Spectrometer Using an Integrated Optical Phased Array in Silicon Nitride and Fourier Imaging Open
We present a novel hybrid configuration of a spectrometer consisting of an integrated Si3N4 optical phased array and a free-space Fourier-space imaging system. It combines broadband and high resolution performance in a small on-chip footpr…
View article: Clinical Validation of Carotid-Femoral Pulse Wave Velocity Measurement Using a Multi-Beam Laser Vibrometer: The CARDIS Study
Clinical Validation of Carotid-Femoral Pulse Wave Velocity Measurement Using a Multi-Beam Laser Vibrometer: The CARDIS Study Open
BACKGROUND: Carotid-femoral pulse wave velocity (cfPWV) is the gold standard for noninvasive arterial stiffness assessment, an independent predictor of cardiovascular disease, and a potential parameter to guide therapy. However, cfPWV is n…
View article: Impact of the Oxide Aperture Width on the Degradation of 845 Nm VCSELs for Silicon Photonics
Impact of the Oxide Aperture Width on the Degradation of 845 Nm VCSELs for Silicon Photonics Open
For the first time, we analyzed the degradation as a function of the oxide aperture in 845 nm VCSELs designed for silicon photonics (SiPh) applications. First, we evaluated the optical degradation of the devices by collecting EL images dur…
View article: Non-contact photoacoustic imaging with a silicon photonics-based Laser Doppler Vibrometer
Non-contact photoacoustic imaging with a silicon photonics-based Laser Doppler Vibrometer Open
Photoacoustic imaging has emerged as a powerful, non-invasive modality for various biomedical applications. Conventional photoacoustic systems require contact-based ultrasound detection and expensive and bulky high-power lasers for the exc…
View article: Modeling the Electrical Degradation of Micro-transfer-Printed 845 nm VCSILs for Silicon Photonics
Modeling the Electrical Degradation of Micro-transfer-Printed 845 nm VCSILs for Silicon Photonics Open
This article deals for the first time with the electrical degradation of novel 845 nm vertical-cavity silicon-integrated lasers (VCSILs) for silicon photonics (SiPh). We analyzed the reliability of these devices by submitting them to high …
View article: PA-394 Access to diagnosis of bloodstream infections in low-resource settings: evaluation of the improved “Turbidimeter” prototype to detect bacterial growth in manual blood culture systems
PA-394 Access to diagnosis of bloodstream infections in low-resource settings: evaluation of the improved “Turbidimeter” prototype to detect bacterial growth in manual blood culture systems Open
Background In low-resource settings, blood culture bottles (BCBs) are often visually inspected for signs of growth. We developed a "Turbidimeter" to objectively assess growth based on the presence of broth turbidity. The first generation T…
View article: Heterogeneous integration in silicon photonics: opportunities and challenges: opinion
Heterogeneous integration in silicon photonics: opportunities and challenges: opinion Open
The application span of silicon photonics is rapidly evolving from high speed transceivers for data- and telecommunication to a broad range of functionalities for many different markets, especially in the sensing and computing space. As a …
View article: Design and Optimizing Backside Grating Couplers in Si-Photonics Circuits
Design and Optimizing Backside Grating Couplers in Si-Photonics Circuits Open
Grating couplers are essential in photonic systems, facilitating efficient light coupling between optical fibers and on-chip waveguides and allowing for wafer-level testing. With the increasing integration of photonics in communication sys…
View article: On-chip multi-beam frequency shifter through sideband separation
On-chip multi-beam frequency shifter through sideband separation Open
In this paper, we introduce a novel method to realize a multi-beam optical frequency shifting component for photonic integrated circuits, utilizing an array of parallel optical modulators and a free-propagation region (FPR), such as a slab…
View article: Enhancing Multichannel Laser-Doppler Vibrometry Signals with Application to (Carotid-Femoral) Pulse Transit Time Estimation
Enhancing Multichannel Laser-Doppler Vibrometry Signals with Application to (Carotid-Femoral) Pulse Transit Time Estimation Open
Pulse-wave velocity (PWV) can be used to quantify arterial stiffness, allowing for a diagnosis of this condition. Multi-beam laser-doppler vibrometry offers a cheap, non-invasive and user-friendly alternative to measuring PWV, and its feas…
View article: Understanding the Optical Degradation of 845 nm Micro-Transfer-Printed VCSILs for Photonic Integrated Circuits
Understanding the Optical Degradation of 845 nm Micro-Transfer-Printed VCSILs for Photonic Integrated Circuits Open
For the first time we investigate the optical degradation of vertical-cavity silicon-integrated lasers (VCSILs) designed for operation at 845 nm in photonic integrated circuits (PICs). The study is based on the combined electro-optical cha…
View article: Silicon photonics based laser doppler vibrometer for non-contact photoacoustic sensing
Silicon photonics based laser doppler vibrometer for non-contact photoacoustic sensing Open
Non-contact detection of photoacoustic signals is important for various applications, particularly in medical sensing and imaging, where contact methods can be uncomfortable or risky for the patient. Techniques using optical detection of v…
View article: Analysis of defect-related optical degradation of VCSILs for photonic integrated circuits
Analysis of defect-related optical degradation of VCSILs for photonic integrated circuits Open
Laser diodes are of paramount importance for on-chip telecommunications applications, and a wide range of sensing devices that require near-infrared sources. In this work, the devices under test are vertical-cavity silicon-integrated laser…
View article: UV Photonic-Integrated-Circuits-Based Structured Illumination Microscopy With a Field of View Larger than $100\,\mu \text{m}^{2}$
UV Photonic-Integrated-Circuits-Based Structured Illumination Microscopy With a Field of View Larger than $100\,\mu \text{m}^{2}$ Open
Photonic integrated circuits (PICs) are expected to add practicality and new functionalities in a considerable number of optical applications, including optical microscopy. Here, we present a PIC design allowing a far-field structured UV i…
View article: Micro-Transfer Printing for Heterogeneous Si Photonic Integrated Circuits
Micro-Transfer Printing for Heterogeneous Si Photonic Integrated Circuits Open
Silicon photonics (SiPh) is a disruptive technology in the field of integrated photonics and has experienced rapid development over the past two decades. Various high-performance Si and Ge/Si-based components have been developed on this pl…
View article: Nanoporous Silica–Alumina Films Fabricated on Silicon Photonic Chips for Selective Ammonia Sensing
Nanoporous Silica–Alumina Films Fabricated on Silicon Photonic Chips for Selective Ammonia Sensing Open
Surface-modified nanoporous silica films offer attractive features for analyte-specific gas detection applications. Here we demonstrate the integration of highly porous silica-alumina films on silicon nanophotonic chips and their performan…
View article: Angled Flip-Chip Integration of VCSELs on Silicon Photonic Integrated Circuits
Angled Flip-Chip Integration of VCSELs on Silicon Photonic Integrated Circuits Open
An investigation of angled flip-chip integration of a singlemode 850 nm vertical-cavity surface-emitting laser (VCSEL) on a silicon nitride photonic integrated circuit (PIC) is presented. Using numerical FDTD simulations, we consider the c…
View article: PIXAPP Photonics Packaging Pilot Line – Development of a Silicon Photonic Optical Transceiver With Pluggable Fiber Connectivity
PIXAPP Photonics Packaging Pilot Line – Development of a Silicon Photonic Optical Transceiver With Pluggable Fiber Connectivity Open
This paper demonstrates how the PIXAPP Photonics Packaging Pilot Line uses its extensive packaging capabilities across its European partner network to design and assemble a highly integrated silicon photonic-based optical transceiver. The …
View article: Micro-transfer printed silicon nitride grating couplers for efficient on-chip light coupling
Micro-transfer printed silicon nitride grating couplers for efficient on-chip light coupling Open
We demonstrate a new post-processing approach to efficiently couple light in silicon nitride (Si3N4) photonic integrated circuits (PIC) via grating couplers. Thin-film coupons of apodised Si3N4 grating couplers functionalized with metallic…
View article: Template Matching and Matrix Profile for Signal Quality Assessment of Carotid and Femoral Laser Doppler Vibrometer Signals
Template Matching and Matrix Profile for Signal Quality Assessment of Carotid and Femoral Laser Doppler Vibrometer Signals Open
Background: Laser-Doppler Vibrometry (LDV) is a laser-based technique that allows measuring the motion of moving targets with high spatial and temporal resolution. To demonstrate its use for the measurement of carotid-femoral pulse wave ve…
View article: Enabling VCSEL-on-silicon nitride photonic integrated circuits with micro-transfer-printing
Enabling VCSEL-on-silicon nitride photonic integrated circuits with micro-transfer-printing Open
New wavelength domains have become accessible for photonic integrated circuits (PICs) with the development of silicon nitride PICs. In particular, the visible and near-infrared wavelength range is of interest for a range of sensing and com…
View article: Influence of optical amplifiers for on-chip homodyne laser Doppler vibrometers
Influence of optical amplifiers for on-chip homodyne laser Doppler vibrometers Open
Photonic integration allows for the development of compact and relatively cheap laser Doppler vibrometers (LDVs). Optical amplification could enhance the performance of these on-chip LDVs, but the intrinsic noise of optical amplifiers coul…
View article: A Miniaturised, Fully Integrated NDIR CO2 Sensor On-Chip
A Miniaturised, Fully Integrated NDIR CO2 Sensor On-Chip Open
In this paper, we present a fully integrated Non-dispersive Infrared (NDIR) CO2 sensor implemented on a silicon chip. The sensor is based on an integrating cylinder with access waveguides. A mid-IR LED is used as the optical source, and tw…
View article: Raman on-chip: current status and future tracks
Raman on-chip: current status and future tracks Open
On-chip Raman sensing enabled by large-scale photonic integration is a promising technology for biological and healthcare applications. In this contribution we give a review the current status of on-chip Raman sensing with a particular foc…
View article: Optimization of multi-beam silicon photonics based laser Doppler vibrometry for measuring cardiovascular signals on bare skin
Optimization of multi-beam silicon photonics based laser Doppler vibrometry for measuring cardiovascular signals on bare skin Open
Non-invasive monitoring of cardiovascular diseases has been explored by means of laser Doppler vibrometry (LDV). In previous work, we have developed a handheld 6-beam on-chip LDV-device based on silicon photonics that can simultaneously me…
View article: Nonlinear signal errors in homodyne laser Doppler vibrometry induced by strong second-order ghost reflections and their mitigation
Nonlinear signal errors in homodyne laser Doppler vibrometry induced by strong second-order ghost reflections and their mitigation Open
A variety of mechanisms can induce distortions in the output signals of a homodyne laser Doppler vibrometer (LDV). In this paper, the nonlinear LDV distortions caused by a strong second-order ghost reflection originating from lens flares a…