News Article
IMEC Paves The Way Towards Optical Sensing Foils
With this technology, IMEC is working on two types of sensors: array wave guide sensors and optical fibre sensors.
IMEC's associated laboratory at the Ghent University, INTEC, has made the first functional optical links embedded in a flexible substrate. The links include optical wave guides, light sources, and detectors. With this technique, it becomes possible to make foils that sense changes in pressure. Such sensing, skin like foils could be used for monitoring irregular or moving surfaces, e.g. in robots, pliable machinery, or as an artificial skin.
Integrated optical interconnections have the advantage that they are insensitive to electromagnetic interference, applicable in harsh environments, and highly sensitive. Last year, IMEC already reported embedded optical links on rigid surfaces. The current research takes optoelectronics one step further. Standard commercially available GaAs photo detectors and GaAs VCSELs (vertical cavity surface emitting laser) are thinned down to 30μm. Next, they are embedded into a flexible foil of optical transparent material and optically coupled with embedded wave guides and out-of-plane micro mirrors. The resulting structure shows good adhesion and flexible behaviour.
With this technology, IMEC is working on two types of sensors: array wave guide sensors and optical fibre sensors. Both can be used for sensor foils. Array wave guide sensors rely on the change in coupling between arrays of crossing wave guides. Two layers of polymer wave guides are separated by a thin layer of soft silicone. When no pressure is applied, no crosstalk is detected. But when pressure is applied to the foil, the distance between the wave guides in the separated layers decreases, and light is transmitted from one layer to the other. This low-cost sensor is ideally suited for high-density pressure sensors on small areas.
Optical sensing foils combine two technologies that have lately seen a growing interest: integrated optical interconnections, and flexible, stretchable electronics. The ambition of researchers is to create a flexible and stretchable skin like foil sensitive to touch, pressure, or deformation. Such artificial skin could be used in medical and industrial environments. To this aim, a group of European research institutes, including IMEC, are collaborating in the 7th Framework project PHOSFOS (Photonic Skins For Optical Sensing).
PHOSFOS will develop photonic foils based on optical fibre sensors. These foils are targeted at applications in civil engineering and medicine. They will, for example, continuously monitor the integrity and the behaviour of buildings, dams, bridges, roads, or tunnels. Other uses are monitoring aircraft wings, helicopter blades, or windmill blades. They will enable early warning of failure or anomaly. Skin like PHOSFOS membranes will also be used in long-term monitoring of respiration and cardiac activity, as well as the detection of pressure points under bed ridden patients.
Integrated optical interconnections have the advantage that they are insensitive to electromagnetic interference, applicable in harsh environments, and highly sensitive. Last year, IMEC already reported embedded optical links on rigid surfaces. The current research takes optoelectronics one step further. Standard commercially available GaAs photo detectors and GaAs VCSELs (vertical cavity surface emitting laser) are thinned down to 30μm. Next, they are embedded into a flexible foil of optical transparent material and optically coupled with embedded wave guides and out-of-plane micro mirrors. The resulting structure shows good adhesion and flexible behaviour.
With this technology, IMEC is working on two types of sensors: array wave guide sensors and optical fibre sensors. Both can be used for sensor foils. Array wave guide sensors rely on the change in coupling between arrays of crossing wave guides. Two layers of polymer wave guides are separated by a thin layer of soft silicone. When no pressure is applied, no crosstalk is detected. But when pressure is applied to the foil, the distance between the wave guides in the separated layers decreases, and light is transmitted from one layer to the other. This low-cost sensor is ideally suited for high-density pressure sensors on small areas.
Optical sensing foils combine two technologies that have lately seen a growing interest: integrated optical interconnections, and flexible, stretchable electronics. The ambition of researchers is to create a flexible and stretchable skin like foil sensitive to touch, pressure, or deformation. Such artificial skin could be used in medical and industrial environments. To this aim, a group of European research institutes, including IMEC, are collaborating in the 7th Framework project PHOSFOS (Photonic Skins For Optical Sensing).
PHOSFOS will develop photonic foils based on optical fibre sensors. These foils are targeted at applications in civil engineering and medicine. They will, for example, continuously monitor the integrity and the behaviour of buildings, dams, bridges, roads, or tunnels. Other uses are monitoring aircraft wings, helicopter blades, or windmill blades. They will enable early warning of failure or anomaly. Skin like PHOSFOS membranes will also be used in long-term monitoring of respiration and cardiac activity, as well as the detection of pressure points under bed ridden patients.
