Dynamically Reconfigurable Broadband Polarization Converter

A polarization converter with broadband polarization characteristics and capable of dynamic reconfiguration is proposed. By introducing out-of-plane degrees of freedom, dynamically tunable broadband and high-efficiency linear polarization conversion within the wavelength range of 2000 –2800 nm is achieved. Research results indicate that when a two-dimensional (2D) split-ring resonator (SRR) is irradiated by a low-dose focused ion beam, it will deform upward and transform into a three-dimensional (3D) SRR, achieving a linear polarization conversion efficiency of over 90%. The 3D SRR can be driven by electrostatic force to return to the 2D SRR state, thereby realizing the dynamic reconfiguration of this polarization converter. By changing the applied voltage and adjusting the structural parameters, a tailored polarization converter that exhibits broadband performance and high polarization conversion efficiency is also achieved. The results may provide novel ideas and technical methodologies for various applications such as polarized optical imaging, emerging display technologies, polarized optical communication, and optical sensing.