51 citations · 74 across the 3 of their papers we have counts for
9 papers
Dissipation in the Broadband and Ultrastrong Coupling Regimes of Cavity Quantum Electrodynamics: An Ab Initio Quantized Quasinormal Mode Approach
Chris Gustin, Juanjuan Ren, Sebastian Franke +1
Phenomenological approaches to photon loss have long been the workhorse of cavity-QED, but prove inadequate in the presence of sufficiently broadband light-matter interactions. We…
Gain-modified emission dynamics between two quantum emitters in a plasmonic gain cavity system
Becca VanDrunen, Juanjuan Ren, Sebastian Franke +1
We present a general theory of gain-modified emission dynamics between two quantum emitters (two level systems) in a linear gain medium, demonstrating how gain modifies the usual r…
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…
Fluctuation-dissipation theorem and fundamental photon commutation relations in lossy nanostructures using quasinormal modes
Sebastian Franke, Juanjuan Ren, Stephen Hughes +1
We provide theory and formal insight on the Green function quantization method for absorptive and dispersive spatial-inhomogeneous media in the context of dielectric media. We show…
Quantized quasinormal mode description of non-linear cavity QED effects from coupled resonators with a Fano-like resonance
Sebastian Franke, Marten Richter, Juanjuan Ren +2
We employ a recently developed quantization scheme for quasinormal modes (QNMs) to study a nonperturbative open cavity-QED system consisting of a hybrid metal-dielectric resonator…