• • Co-doping chiral emitters of opposite handedness into DIO mesogen enables continuous helical pitch modulation and reversible handedness inversion under a single electric field, achieving on/off gating, magnitude tuning, and sign inversion in one system.
• • The system leverages DIO's high dielectric anisotropy and multiple mesophases to achieve rapid electric-field response, with unwinding field described by E_u = (π^2 K_22)/(P^2 ε_a), enabling precise control over chiroptical properties.
• • Reversible handedness inversion is demonstrated through competitive chiral fields, allowing dynamic switching of CPL sign without material degradation, a critical requirement for reconfigurable chiroptical devices.
• • This integrated single-stimulus modulation addresses the long-standing challenge of achieving multimodal CPL control in a single material, offering a scalable platform for smart photonic and security applications.