Fig. 6
From: Bound states in the continuum and long-lived electronic resonances in two-tangent loops cavity
(a) A zoom-in picture for the transmittance (black line) and reflectance (red line) coefficients versus \(k L/2 \pi\) for the resonance given in Fig. 5a (or 5b). The parameters are \(\delta =11\) nm and \(L_1=(100+\delta )\) nm, \(L_2=(100-\delta )\) nm. Notice that the two loops interfere destructively (constructively), giving rise to a zero reflectance (total transmittance). This result is in accordance with the conservation law \(R + T = 1\). Note also that the total transmittance occurs between two transmission zeros induced by the two SIBICs provided by \(C(L_1/2)=0\) and \(C(L_2/2)=0\). This result can be qualified as Fano resonance. (b) The same as the transmittance in (a) but for \(\delta =11\) nm (black line), 12 nm (blue line) and 13 nm (red line ) respectively. One can notice that with increasing (decreasing) the value of the tuning parameter \(\delta\) (i.e. the difference between the lengths of the two loops), the quality of the resonance is decreased (increased).
