Simultaneous Conversion of Polarization and Frequency via Time‐Division‐Multiplexing Metasurfaces

Metasurfaces are artificially engineered two-dimensional materials composed of sub-wavelength meta-atoms, which have shown unprecedented capabilities in manipulating the amplitude, phase, frequency, and polarization states electromagnetic waves. Specifically, control can be attained via suitable anisotropic, linear, time-invariant designs, while frequency conversion is realized nonlinear or time-varying platforms. Simultaneous manipulations would considerable practical interest many application scenarios, but remain unattainable with current approaches. Here, a time-division-multiplexing metasurface proposed to realize simultaneous frequency. The platform relies on time-modulated switches and, by varying duty cycle time delays channels, arbitrarily rotate at central operation, synthesize various selected harmonic frequencies. Theoretical predictions validated measurements prototype operating microwave frequencies, providing first experimental evidence conversions metasurfaces. outcomes open new pathway waves metasurfaces, may for broad variety applications scenarios ranging from imaging quantum optics.