Enhanced light absorption in thin silicon photodetectors with photon-trapping structures

https://phys.org/news/2023-07-absorption-thin-silicon-photodetectors-photon-trapping.html

"mn cylindrical Si slab placed over insulating substrate, metallic fingers... circular holes Si filled periodic pattern... normally incident light  bends 90° upon hitting the surface, making it travel laterally along the Si plane.. laterally propagating modes increase propagation length light and slow it, more light–matter interaction and increased absorption... absorption efficiency >68%, absorption coefficient several times higher... low parasitic capacitance... optoelectronics, ultrafast computer networks and imaging technology"

Related: Photonic crystals bend light as though it were under the influence of gravity
https://phys.org/news/2023-10-photonic-crystals-gravity.html