54 citations · 308 across the 13 of their papers we have counts for
8 papers · 1 filter
Gain-compensated metal cavity modes and a million-fold improvement of Purcell factors
Becca VanDrunen, Juanjuan Ren, Sebastian Franke +1
Using a rigorous mode theory for gain-compensated plasmonic dimers, we demonstrate how quality factors and Purcell factors can be dramatically increased, improving the quality fact…
Classical Purcell factors and spontaneous emission decay rates in a linear gain medium
Juanjuan Ren, Sebastian Franke, Becca VanDrunen +1
Recently the photonic golden rule, which predicts that the spontaneous emission rate of an atom depends on the projected local density of states (LDOS), was shown to fail in an opt…
Impact of mode regularization for quasinormal mode perturbation theories
Sebastian Franke, Juanjuan Ren, Stephen Hughes
We give insight into the critical problem of an open resonator that is subject to a perturbation outside of its cavity region. We utilize the framework of quasinormal modes (QNMs),…
Quasinormal mode analysis of chiral power flow from linearly polarized dipole emitters coupled to index-modulated microring resonators close to an exceptional point
Juanjuan Ren, Sebastian Franke, Stephen Hughes
Chiral emission can be achieved from a circularly polarized dipole emitter in a nanophotonic structure that possess special polarization properties such as a polarization singulari…
Fermi's golden rule for spontaneous emission in absorptive and amplifying media
Sebastian Franke, Juanjuan Ren, Marten Richter +2
We demonstrate a fundamental breakdown of the photonic spontaneous emission (SE) formula derived from Fermi's golden rule, in absorptive and amplifying media, where one assumes the…
Quasinormal modes and Purcell factors of coupled loss-gain resonators and index-modulated ring resonators near exceptional points
Juanjuan Ren, Sebastian Franke, Stephen Hughes
We first present a quasinormal mode (QNM) theory for coupled loss-gain resonators working near an exceptional point. Assuming linear media, which can be fully quantified using the…
Efficient near-field to far-field transformations for quasinormal modes of optical cavities and plasmonic resonators
Juanjuan Ren, Sebastian Franke, Andreas Knorr +2
We describe an efficient near-field to far-field transformation for optical quasinormal modes, which are the dissipative modes of open cavities and plasmonic resonators with comple…
A photonic interface of chiral cavity quantum electrodynamics
Fan Zhang, Lingxiao Shan, Juanjuan Ren +5
Cavity quantum electrodynamics studies light-matter interactions at single quanta level. Chiral photon-emitter coupling in photonic structures is characterized as unidirectional pr…