Publicaties

Composite materials offer significant performance advantages due to their lightweight, high-strength, and high stiffness.This led to their adoption in several industrial sectors with particular emphasis on the aerospace industry which hasundergone a transformation towards a composite-dominated new standard. In order to respond to the increased demand,it is mandatory to focus on an efficient and well-controlled curing cycle of the resin, which ...

The strength of architectural glass (soda-lime silica) is highly dependent on surface flaws generated during production, handling and service life. Fracture mechanical investigation of glass, however, is challenging due to e.g. the randomness of flaw size, flaw orientation and quality. Generation of radial and median cracks is inevitable while using a mechanical indenter with direct contact. These undesirable effects, along with uncertainty ...

V-grooves as passive alignment structures allow for easy and cost-efficient packaging of planar optical sensors. Micron-scale tolerances for alignment can be met during fabrication, eliminating the need for accurate alignment tools during assembly. Mechanical stability of the structure is verified with a temperature test.

We propose a simple optical interface for coupling between a single mode fiber and a grating on a Photonic Integrated Circuit (PIC), by coupling from the back side using a ball lens. This way, the top side of the PIC remains accessible for sensing.

To increase the manufacturing throughput and lower the cost of silicon photonics packaging, an alignment tolerant approach is required to simplify the process of fiber-to-chip coupling. Here, we demonstrate an alignment-tolerant expanded beam backside coupling interface (in the O-band) for silicon photonics by monolithically integrating microlenses on the backside of the chip. After expanding the diffracted optical beam from a TE-mode grating ...

Recent advancements in photonic-electronic integration push towards denser multichannel fiber to silicon photonic chip coupling solutions. However, current packaging schemes based on suitably polished fiber arrays do not provide sufficient scalability. Alternatively, lithographically-patterned fused silica glass interposers have been proposed, allowing for the integration of fanout waveguides between a dense array of on-chip silicon waveguides ...

Epilepsy is a chronic, neurological disorder affecting millions of people every year. The current available pharmacological and surgical treatments are lacking in overall efficacy and cause side-effects like cognitive impairment, depression, tremor, abnormal liver and kidney function. In recent years, the application of optogenetic implants have shown promise to target aberrant neuronal circuits in epilepsy with the advantage of both high ...

In a waveguide-type display for augmented reality, the image is injected in the waveguide and extracted in front of the eye appearing superimposed on the real world scene. An elegant and compact way of coupling these images in and out is by using blazed gratings, which can achieve high diffraction efficiencies, thereby reducing stray light and decreasing the required power levels. This study investigates the fabrication of blazed gratings with ...

Glass is a brittle material and any damage or modification of its surface may have a profound impact on the strength. To modify the glass surface, the precision of the instrument is determining for achieving the most reliable results.Nowadays, laser technology as a non-contact tool is employed as a glass cutting, drilling and holing tool in many applications such as sensors and optical communications. Along with high speed, flexibility, and ...