Silicon Nano Wires for Optical Elements
Lead partner: SIEMENS
Periodic holes are defined in silicon wafer by photolithography, etched, and then filled by vacuum filling. The supporting matrix is then removed to leave a periodic pattern of needles.
The photonic crystal band gap is utilized in order to achieve guiding, as well as a local enhancement of the light intensity.
Nano-Structured Optical Coatings
Lead partner: SINTEFBy patterning the silicon surface, mirror or anti-reflective properties can be achieved for selected wavelengths.
In comparison, the reflectivity of unpatterned silicon is ~31%.