A spatiotemporal wedge formed by two subluminal moving interfaces can compress and amplify pulses through cascaded Doppler reflections, with critical opening and orientation angles separating focusing from superfocusing.
High-harmonic generation by field enhanced femtosecond pulses in metal-sapphire nanostructure,
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Spatiotemporal Superfocusing
A spatiotemporal wedge formed by two subluminal moving interfaces can compress and amplify pulses through cascaded Doppler reflections, with critical opening and orientation angles separating focusing from superfocusing.