Theoretical investigation of two-dimensional sub-wavelength structures fabricated by multi-beam surface plasmon interference lithographyXiangxian Wang, Tianxu Jia, Yaqian Ren, Yingwen Su, Zhenyu Chen, Yunping Qi and Xiaolei WenEPL, 136 3 (2021) 34002DOI: https://doi.org/10.1209/0295-5075/ac2cf9