Fano Resonances in Optics and Microwaves

Abstract

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Experimental observation of the avoided crossing of two S -matrix resonance poles in an ultracold atom collider

“…The tunability of the Feshbach resonance provides the crucial agent that allows us to record the imprint of this intriguing phenomenon on a quantum system. Curiously, in classical systems such as coupled microwave [46] and optical resonators [47], the interactions of poles and their roles in forming Fano-Feshbach resonances and exceptional points have been studied extensively, underscoring the ubiquity of these phenomena in coupled resonant systems [48][49][50][51][52][53][54]. For atomic scattering, the "collision" of S-matrix poles at an exceptional point [43] (case II in Table I) remains to be experimentally observed.…”