The article presents a novel approach to fabricating electro-optic metasurfaces using sol-gel-derived barium titanate (BTO) through a bottom-up, etch-free process. BTO, known for its strong electro-optic Pockels coefficient, is often limited in thin-film form due to costly growth processes or low thickness. The researchers developed a method to create active metasurfaces with high-quality resonances at 633 nm, achieving a quality factor of 200. This enhancement in light-matter interaction significantly boosts the Pockels effect, enabling electro-optic modulation with a driving frequency of up to 5 MHz and voltages below 1 V. The metasurface's transmission is modulated by resonant enhancement of the modulation amplitude by two orders of magnitude. This work demonstrates the potential for low-cost, large-scale free-space modulators and tunable metalenses, marking a significant advancement in the field of electro-optic metasurfaces.The article presents a novel approach to fabricating electro-optic metasurfaces using sol-gel-derived barium titanate (BTO) through a bottom-up, etch-free process. BTO, known for its strong electro-optic Pockels coefficient, is often limited in thin-film form due to costly growth processes or low thickness. The researchers developed a method to create active metasurfaces with high-quality resonances at 633 nm, achieving a quality factor of 200. This enhancement in light-matter interaction significantly boosts the Pockels effect, enabling electro-optic modulation with a driving frequency of up to 5 MHz and voltages below 1 V. The metasurface's transmission is modulated by resonant enhancement of the modulation amplitude by two orders of magnitude. This work demonstrates the potential for low-cost, large-scale free-space modulators and tunable metalenses, marking a significant advancement in the field of electro-optic metasurfaces.