  Spatial light modulators have desirable applications in sensing and free
space communication because they create an interface between the optical and
electronic realms. Electro-optic modulators allow for high-speed intensity
manipulation of an electromagnetic wavefront. However, most surfaces of this
sort pose limitations due to their ability to modulate intensity rather than
phase. Here we investigate an electro-optic modulator formed from a
silicon-organic Huygens' metasurface. In a simulation-based study, we discover
a metasurface design immersed in high-performance electro-optic molecules that
can achieve near-full resonant transmission with phase coverage over the full
2$\pi$ range. Through the electro-optic effect, we show 140$^\circ$ (0.79$\pi$)
modulation over a range of -100 to 100 V at 1330 nm while maintaining
near-constant transmitted field intensity (between 0.66 and 0.8). These results
potentiate the fabrication of a high-speed spatial light modulator with the
resolved parameters.
