Electromagnetically induced transparency-like effect in a lithium niobate resonator via electronic control

In this study,we theoretically proposed a method to achieve an electromagnetically induced transparency(EIT)-like effect in a whispering gallery mode resonator(WGMR)and experimentally validated the method in a lithium niobate(LN)device.Benefitting from the electro-optic and inverse piezoelectric effects of the LN material,two modes of the LN WGMR that are close in frequency can be tuned at different tuning rates,resulting in EIT-like resonance lineshapes.By varying the electric field applied to the LN WGMR,the full dynamic of the EIT-like phenomenon can be precisely controlled.The experimental results agreed well with the calculations based on the coupled mode theory.Moreover,we observed a hysteresis resulting from the photorefractive effect of LN.We believe our proposed method and demonstrated devices offer a way to control an EIT-like effect,which could have potential applications in light storage,quantum information processing,and enhanced sensing techniques.