It’s been a while since the sport of badminton has seen another great backhand smash. Taufik Hidayt was the defacto backhand king. See videos on DuckduckGo search.
Victor Axelsen of Denmark has been working on his backhand smashes and I believe it’s the new birth of the backhand smash. I’ve seen him use it at least 4-5 times a match.
Here is one of his best smashes on the backhand. I don’t like that he spins around, but hey, very effective!