Optimization of porous silicon structure as antireflective material Daohan Ge, Zhou Hu, Zhiwei Fang, Chao Ni, Liqiang Zhang and Shining Zhu Eur. Phys. J. D, 76 2 (2022) 27 Published online: 11 February 2022 DOI: 10.1140/epjd/s10053-022-00344-3