Eliminating domain wall bifurcation in X-cut thin-film lithium niobate via high-temperature poling

【摘要】 Periodically poled thin-film lithium niobate(TFLN) exhibits exceptional frequency conversion efficiency, positioning it as a key platform for nonlinear integrated photonics and optical quantum technologies. The efficiency of these nonlinear processes is primarily determined by the quality of the ferroelectric domain structure. This work systematically investigates the fabrication and optimization of domain structures in X-cut TFLN using electric-field poling. Domain morphologies were characterized via piezoresponse force microscopy(PFM), while process parameters, including polarization pulse duration,pulse number, and temperature, were systematically optimized to achieve microdomain structures with near-ideal 50:50duty cycles. Furthermore, domain wall bifurcation defects induced by room-temperature poling were mitigated via a repeated poling approach at elevated temperatures. This methodology provides critical technical foundations for developing high-performance TFLN frequency conversion devices.更多还原

【Abstract】 Periodically poled thin-film lithium niobate(TFLN) exhibits exceptional frequency conversion efficiency, positioning it as a key platform for nonlinear integrated photonics and optical quantum technologies. The efficiency of these nonlinear processes is primarily determined by the quality of the ferroelectric domain structure. This work systematically investigates the fabrication and optimization of domain structures in X-cut TFLN using electric-field poling. Domain morphologies were characterized via piezoresponse force microscopy(PFM), while process parameters, including polarization pulse duration,pulse number, and temperature, were systematically optimized to achieve microdomain structures with near-ideal 50:50duty cycles. Furthermore, domain wall bifurcation defects induced by room-temperature poling were mitigated via a repeated poling approach at elevated temperatures. This methodology provides critical technical foundations for developing high-performance TFLN frequency conversion devices.更多还原