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In this work using three-dimensional particle-in-cell simulations andanalytical considerations we demonstrate intense high-order plasma surfaceharmonics carrying a time-varying orbital angular momentum (OAM) -- theself-torque. We show that by using two laser beams with different OAMs $l_1$and $l_2$ and a certain delay between each other and shooting them obliquely onan overdense plasma target, one can generate harmonics with OAM spanning $nl_1$to $nl_2$, where $n$ is the order of the harmonic. Such intense self-torquedharmonics can offer new possibilities in ultrafast spectroscopy.

Intense harmonics with time-varying orbital angular momentum from relativistic plasma mirrors