Fig. 4: Quantum yield η of hybrid CEP cavity.
From: Enhanced quantum coherence of plasmonic resonances with a chiral exceptional points
a Quantum yield \(\eta\) of hybrid CEP cavity versus \({Q}_{c}\) and \(\phi\). The red dotted line surrounds the region of enhanced quantum yield at CEP, i.e., \(\eta \, > \, {\eta }_{0}\). The black dashed line shows the parameter area of cavity radiation enhancement \({\eta }_{r}=\max \left[{\Phi }_{r}\right]/\max \left[{\Phi }_{r}^{0}\right] \, > 10\), while the white dashed dotted line shows the parameter area of plasmon absorption reduction \({\eta }_{d}=\min \left[{\Phi }_{d}^{0}\right]/\min \left[{\Phi }_{d}\right] > 10\) for dipolar plasmonic mode. The green triangle and yellow star indicate the parameters of (c, d) and (e, f), respectively. b Quantum yield \({\eta }_{0}\) of hybrid cavity without CEP. c, d Quantum yield and plasmon absorption of dipolar mode of hybrid CEP cavity for \({Q}_{c} \, \approx \, {1.5\times 10}^{4}\) [see yellow star in (a)], respectively. e, f Quantum yield and cavity radiation of hybrid CEP cavity for \({Q}_{c}={10}^{5}\) [see green triangle in (a)], respectively. The inset shows a close-up of quantum yield around cavity resonance. In (c, d) and (e, f), the results of usual hybrid cavity without CEP are also shown for comparison (black lines). The circles represent the results obtained by numerically calculating the expectation values of two operators, e.g., \(\left\langle {a}^{{{\dagger}} }a\right\rangle\), using QuTip83. Other parameters are \({g}_{c}=0.144{{{{{\rm{meV}}}}}}\), \({g}_{a}=7.2{{{{{\rm{meV}}}}}}\), \({g}_{1}=-2.9{{{{{\rm{meV}}}}}}\), \({\kappa }_{r}=2.45{{{{{\rm{meV}}}}}}\), \({\kappa }_{o}=200{{{{{\rm{meV}}}}}}\), \({Q}_{c}={10}^{5}\), \({\gamma }_{0}=3\mu {{{{{\rm{eV}}}}}}\), \({\gamma }_{m}=83\mu {{{{{\rm{eV}}}}}}\) and \({\gamma }_{{{{{{\rm{p}}}}}}}=0\)15.
