Y-Shaped Demultiplexer Photonic Circuits Based on Detuned Stubs: Application to Radiofrequency Domain

We present a theoretical and experimental study of photonic demultiplexers based on detuned stubs. The consist Y-shaped structures with one input line two output lines. Two different types are proposed to achieve selective transfer single mode in without disturbing the second one. (i) In first platform each contains stubs attached at sites (U-shaped resonators). derive closed form geometrical parameters selected frequency while keeping other unaffected. selection can be made basis mechanisms, namely Fano or an electromagnetic induced transparency (EIT) resonance. Consequently, demultiplexing schemes designed by combination such as Fano-Fano, Fano-EIT EIT-EIT. particular, width EIT resonances become zero for appropriate choice stubs’ lengths, giving rise trapped modes also called bound continuum states (BICs) infinite quality factors. show that crosstalk between outputs reach minimum values around ?45 dB. (ii) platform, comb defect stub. latter is appropriately filter few frequencies bandgap comb. analytical calculations performed help Green’s function method which enables us transmission reflection coefficients well density (DOS). These results confirmed measurements using coaxial cables radio domain.