Dynamic modulation of multi-mode ultra-strong coupling at ambient conditions Tianhang Ren, Yuming Huang, Qingan Sun, Lei Jin, Yilin Wang, Li Yu and Kun Liang Eur. Phys. J. D, 76 10 (2022) 195 Published online: 20 October 2022 DOI: 10.1140/epjd/s10053-022-00521-4