Deterministic generation of tailored subcycle optical waveforms—from unipolar to multipeak structures—remains a challenge in ultrafast science. We propose an approach based on space-time field transformation via structured plasma mirrors. It is shown that tailored plasma density profiles can produce customizable subcycle optical waveforms—from rectangular to multipeak profiles—via direct spatial-to-temporal mapping. The underlying single-atom dynamics are validated by three-dimensional time-dependent Schrödinger equation simulations. A scaling relation $\tau =2L/c$ is established, linking the spatial period $L$ of the density modulation to the temporal separation $\tau$ between waveform features. This relation may be viewed as a temporal analog of Bragg diffraction. The methodology provides a route to optical field control in attosecond science and petahertz electronics, where spatial material structure directly influences temporal light structure. The extension of this approach to solid-state platforms, including composition-modulated superlattices, is briefly discussed.

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• Light-matter interaction
• Nonlinear optics
• Optics & lasers
• Strong electromagnetic field effects
• Ultrafast optics
• Ultrafast phenomena