title: Fundamental bounds on decay rates in asymmetric single-mode optical resonators.
abstract: We derive tight upper and lower bounds of the ratio between decay rates to two ports from a single resonance exhibiting Fano interference, based on a general temporal coupled-mode theory formalism. The photon transport between these two ports involves both direct and resonance-assisted contributions, and the bounds depend only on the direct process. The bounds imply that, in a lossless system, full reflection is always achievable at Fano resonance, even for structures lacking mirror symmetries, while full transmission can only be seen in a symmetric configuration where the two decay rates are equal. The analytic predictions are verified against full-field electromagnetic simulations.
authors: Department of Applied Physics, Stanford University, Stanford, California 94305, USA.
authors: Ken Xingze
authors: KX
authors: Wang
authors: Zongfu
authors: Z
authors: Yu
authors: Sunil
authors: S
authors: Sandhu
authors: Shanhui
authors: S
authors: Fan