3-micron wave band mid-infrared polarization-independent graphene modulator Rongguo Lu, Liming Shen, Yujiao Wang, Songwei Cai, Rui Lin, Jinzhan Chen, Zhonghua Yang, Jiangbo Lyu, Xiaoju Wang and Yong Liu Eur. Phys. J. Plus, 136 8 (2021) 862 Published online: 21 August 2021 DOI: 10.1140/epjp/s13360-021-01852-8