Fig. 5: Coherent perfect polarization conversion.
From: Coherent full polarization control based on bound states in the continuum
Experimental setup (a) and perfect polarization conversion under symmetric incidence at incident angles \((\theta ={15}^{{{{{{\rm{o}}}}}}},\varphi ={14}^{{{{{{\rm{o}}}}}}})\) (b) and \((\theta ={20}^{{{{{{\rm{o}}}}}}},\varphi ={11}^{{{{{{\rm{o}}}}}}})\) (c). The perfect polarization conversion point lies on the critical coupling curve in the contour plot (d), consistent with Fig. 2c. Fitted parameters are \({f}_{0}^{{{{{{\rm{TE}}}}}}}=0.2658\) THz, \({f}_{0}^{{{{{{\rm{TM}}}}}}}=0.2655\) THz, and \({\alpha }^{2}=0{.02027}^{2}\) THz for \((\theta ={15}^{{{{{{\rm{o}}}}}}},\varphi ={14}^{{{{{{\rm{o}}}}}}})\). Fitted parameters are \({f}_{0}^{{{{{{\rm{TE}}}}}}}=0.2658\) THz, \({f}_{0}^{{{{{{\rm{TM}}}}}}}=0.2655\) THz, and \({\alpha }^{2}=0{.024}^{2}\) THz for \((\theta ={20}^{{{{{{\rm{o}}}}}}},\varphi ={11}^{{{{{{\rm{o}}}}}}})\). N = 0 in all figures.
