Johan Gustavsson
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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: 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: High-angle deflection of metagrating-integrated laser emission for high-contrast microscopy
High-angle deflection of metagrating-integrated laser emission for high-contrast microscopy Open
Flat metaoptics components are looking to replace classical optics elements and could lead to extremely compact biophotonics devices if integrated with on-chip light sources and detectors. However, using metasurfaces to shape light into wi…
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: 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: Impact of Carrier Transport and Capture on VCSEL Dynamics
Impact of Carrier Transport and Capture on VCSEL Dynamics Open
Using a vertical-cavity surface-emitting laser (VCSEL) equivalent circuit model based on two carrier rate equations to include effects of carrier dynamics, we study the impact of carrier transport and capture on the small- and large-signal…
View article: Low-threshold AlGaN-based UVB VCSELs enabled by post-growth cavity detuning
Low-threshold AlGaN-based UVB VCSELs enabled by post-growth cavity detuning Open
The performance of vertical-cavity surface-emitting lasers (VCSELs) is strongly dependent on the spectral detuning between the gain peak and the resonance wavelength. Here, we use angle-resolved photoluminescence spectroscopy to investigat…
View article: Large-Signal Equivalent Circuit for Datacom VCSELs – Including Intensity Noise
Large-Signal Equivalent Circuit for Datacom VCSELs – Including Intensity Noise Open
Optical interconnects (OIs) continue to require more and more sophisticated driver and receiver electronics as higher baud rates are pushed in datacom, mainly due to the bandwidth stagnation of the optoelectronic components such as the ver…
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: VCSEL Wavelength Setting by Intra-Cavity Phase Tuning — Numerical Analysis and Experimental Verification
VCSEL Wavelength Setting by Intra-Cavity Phase Tuning — Numerical Analysis and Experimental Verification Open
Monolithic multi-wavelength VCSEL arrays, with wavelengths of individual VCSELs precisely set in a post-epitaxial growth process, would enable compact multi-color light sources and transmitters for various sensing and datacom applications.…
View article: Large-Signal Equivalent Circuit for Datacom VCSELs
Large-Signal Equivalent Circuit for Datacom VCSELs Open
Increasing the baud rate in optical interconnects (OIs) will require the use of more sophisticated driver and receiver electronics. This will help overcome the stagnated bandwidth of the Vertical-Cavity Surface-Emitting Laser (VCSEL) and t…
View article: A 310 nm Optically Pumped AlGaN Vertical-Cavity Surface-Emitting Laser
A 310 nm Optically Pumped AlGaN Vertical-Cavity Surface-Emitting Laser Open
Ultraviolet light is essential for disinfection, fluorescence excitation, curing, and medical treatment. An ultraviolet light source with the small footprint and excellent optical characteristics of vertical-cavity surface-emitting lasers …
View article: Optical microprism cavities based on dislocation-free GaN
Optical microprism cavities based on dislocation-free GaN Open
Three-dimensional growth of nanostructures can be used to reduce the threading dislocation density that degrades III-nitride laser performance. Here, nanowire-based hexagonal GaN microprisms with flat top and bottom c-facets are embedded b…
View article: Noise Performance of Single-Mode VCSELs: Dependence on Current Confinement and Optical Loss
Noise Performance of Single-Mode VCSELs: Dependence on Current Confinement and Optical Loss Open
We investigate the intensity and phase noise properties of GaAs-based 1060 nm oxide-confined single-mode vertical-cavity surface-emitting lasers (VCSELs) and their dependence on slope efficiency and current spreading, parameters that contr…
View article: Medias skildring av assimilation och integration : -En kvalitativ tematisk innehållsanalys om medias integrations rapportering-
Medias skildring av assimilation och integration : -En kvalitativ tematisk innehållsanalys om medias integrations rapportering- Open
Den ökade invandringen till Sverige har de senaste decennierna skapat en minskad tolerans och en mer negativ bild av mångfalden. Detta har skapat en ökad främlingsfientlighet och en ökad önskan av konservativa och homogena samhällen och so…
View article: Det beror på vem som svarar : Patienters upplevelser av telefonrådgivningssamtal i psykiatrisk öppenvård
Det beror på vem som svarar : Patienters upplevelser av telefonrådgivningssamtal i psykiatrisk öppenvård Open
Att som sjuksköterska bemöta patienter i telefonrådgivning innebär särskilda svårigheter kopplat till både kommunikation och organisation. Samtal med patienter med psykisk ohälsa kan innebära ytterligare utmaningar där sjuksköterskan får m…
View article: High-power single transverse and polarization mode VCSEL for silicon photonics integration
High-power single transverse and polarization mode VCSEL for silicon photonics integration Open
We demonstrate a 6.5 mW single transverse and polarization mode GaAs-based oxide-confined VCSEL at 850 nm. High power is enabled by a relatively large oxide aperture and an epitaxial design for low resistance, low optical loss, and high sl…
View article: Oncogenic mutations at the EGFR ectodomain structurally converge to remove a steric hindrance on a kinase-coupled cryptic epitope
Oncogenic mutations at the EGFR ectodomain structurally converge to remove a steric hindrance on a kinase-coupled cryptic epitope Open
Significance EGFR cancer mutations display an astonishing tissue-specific asymmetry: in lung cancer, mutations target the intracellular kinase (KD), while in glioblastomas (GBMs), a variety of missense clusters and deletions concentrate at…
View article: 1060 nm Single-Mode VCSEL and Single-Mode Fiber Links for Long-Reach Optical Interconnects
1060 nm Single-Mode VCSEL and Single-Mode Fiber Links for Long-Reach Optical Interconnects Open
We investigate the use of a 1060 nm single-mode vertical-cavity surface-emitting laser (VCSEL) and a 1060 nm single-mode fiber as a competitive single-mode technology for cost- and power-efficient long-reach optical interconnects. Error-fr…
View article: eBDIMS server: protein transition pathways with ensemble analysis in 2D-motion spaces
eBDIMS server: protein transition pathways with ensemble analysis in 2D-motion spaces Open
Summary Understanding how proteins transition between different conformers, and how conformers relate to each other in terms of structure and function, is not trivial. Here, we present an online tool for transition pathway generation betwe…
View article: WebRTC for peer-to-peer streaming from an IP camera
WebRTC for peer-to-peer streaming from an IP camera Open
View article: Large-Signal Circuit Model for Datacom VCSELs
Large-Signal Circuit Model for Datacom VCSELs Open
We present a physics-based equivalent-circuit model for datacom VCSELs, with ambient temperature and self-heating effects accounted for. This circuit model is unique in accounting for carrier capture dynamics between active region continuu…
View article: The eBDIMS path-sampling server: generation, classification and interactive visualization of protein ensembles and transition pathways in 2D-motion space
The eBDIMS path-sampling server: generation, classification and interactive visualization of protein ensembles and transition pathways in 2D-motion space Open
The recent rise of cryo-EM and X-ray high-throughput techniques is providing a wealth of new structures trapped in different conformations. Understanding how proteins transition between different conformers, and how they relate to each oth…
View article: Vertical‐Cavity Silicon‐Integrated Laser with In‐Plane Waveguide Emission at 850 nm (Laser Photonics Rev. 12(2)/2018)
Vertical‐Cavity Silicon‐Integrated Laser with In‐Plane Waveguide Emission at 850 nm (Laser Photonics Rev. 12(2)/2018) Open
Silicon-Integrated Lasers In article number 1700206, Sulakshna Kumari and co-workers experimentally demonstrate a hybrid vertical-cavity silicon-integrated laser (VCSIL) with in-plane emission into a silicon nitride (SiN) waveguide. The in…
View article: 1060 nm VCSELs for long-reach optical interconnects
1060 nm VCSELs for long-reach optical interconnects Open
Reach extension of high capacity optical interconnects based on vertical-cavity surface-emitting lasers (VCSELs) and multimode fibers (MMFs), as needed for large-scale data centers, would benefit from high-speed GaAs-based VCSELs at 1060 n…
View article: The European project Merlin on multi-gigabit, energy-efficient, ruggedized lightwave engines for advanced on-board digital processors
The European project Merlin on multi-gigabit, energy-efficient, ruggedized lightwave engines for advanced on-board digital processors Open
Modern broadband communication networks rely on satellites to complement the terrestrial telecommunication infrastructure. Satellites accommodate global reach and enable world-wide direct broadcasting by facilitating wide access to the bac…
View article: Design of an 845-nm GaAs Vertical-Cavity Silicon-Integrated Laser with an Intracavity Grating for Coupling to a SiN Waveguide Circuit
Design of an 845-nm GaAs Vertical-Cavity Silicon-Integrated Laser with an Intracavity Grating for Coupling to a SiN Waveguide Circuit Open
A short-wavelength hybrid GaAs vertical-cavity silicon-integrated laser (VCSIL) with in-plane waveguide coupling has been designed and optimized using numerical simulations. A shallow etched silicon nitride (SiN) grating is placed inside t…
View article: Thermal lensing effects on lateral leakage in GaN-based vertical-cavity surface-emitting laser cavities
Thermal lensing effects on lateral leakage in GaN-based vertical-cavity surface-emitting laser cavities Open
Lateral leakage of light has been identified as a detrimental loss source in many suggested and experimentally realized GaN-based VCSELs. In the present work we include thermal effects to realistically account for the substantial Joule hea…
View article: Hybrid vertical-cavity laser integration on silicon
Hybrid vertical-cavity laser integration on silicon Open
The hybrid vertical-cavity laser is a potential low current, high-efficiency, and small footprint light source for silicon photonics integration. As part of the development of such light sources we demonstrate hybrid-cavity VCSELs (HC-VCSE…
View article: VCSEL design and integration for high-capacity optical interconnects
VCSEL design and integration for high-capacity optical interconnects Open
Vertical-cavity surface-emitting lasers and multi-mode fibers is the dominating technology for short-reach optical interconnects in datacenters and high performance computing systems at current serial rates of up to 25-28 Gbit/s. This is l…