Blue light absorption enhancement based on vertically channelling modes   in nano-holes arrays
  We investigate the specific optical regime occurring at short wavelengths, in the high absorption regime, in silicon thin-films patterned by periodically arranged nano-holes. Near-field scanning optical microscopy indicates that the incoming light is coupled to vertically channelling modes. Optical modelling and simulations show that the light, travelling inside the low-index regions, is absorbed at the direct vicinity of the nano-holes sidewalls. This channelling regime should be taken into account for light management in optoelectronic devices. 
Guillaume Gomard (INL), Romain Peretti (INL), S\'egol\`ene Callard   (INL), Xianqin Meng (INL), R\'emy Artinyan (INL), Thier...
physics.optics