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Universal lineshapes at the crossover between weak and strong critical coupling in Fano-resonant coupled oscillators.

Zanotto S, Tredicucci A - Sci Rep (2016)

Bottom Line: In this article we discuss a model describing key features concerning the lineshapes and the coherent absorption conditions in Fano-resonant dissipative coupled oscillators.The model treats on the same footing the weak and strong coupling regimes, and includes the critical coupling concept, which is of great relevance in numerous applications; in addition, the role of asymmetry is thoroughly analyzed.Due to the wide generality of the model, which can be adapted to various frameworks like nanophotonics, plasmonics, and optomechanics, we envisage that the analytical formulas presented here will be crucial to effectively design devices and to interpret experimental results.

View Article: PubMed Central - PubMed

Affiliation: Istituto Nazionale di Ottica - CNR, Via Nello Carrara 1, 50019 Sesto Fiorentino (FI), Italy.

ABSTRACT
In this article we discuss a model describing key features concerning the lineshapes and the coherent absorption conditions in Fano-resonant dissipative coupled oscillators. The model treats on the same footing the weak and strong coupling regimes, and includes the critical coupling concept, which is of great relevance in numerous applications; in addition, the role of asymmetry is thoroughly analyzed. Due to the wide generality of the model, which can be adapted to various frameworks like nanophotonics, plasmonics, and optomechanics, we envisage that the analytical formulas presented here will be crucial to effectively design devices and to interpret experimental results.

No MeSH data available.


Related in: MedlinePlus

Coherent absorption universal factor f± (see the comments to Eq. 7 for details) for a coupled-resonator system which behaves symmetrically (a) or asymmetrically (b). Minimum and maximum joint absorption for structure 1 (c) and structure 2 (d,e). Both structures show coherent perfect absorption and transparency (CPA and CPT), but in the latter those are observed at different x-values, i.e., for different states of external excitation, due to the asymmetric behaviour of the cavity.
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f4: Coherent absorption universal factor f± (see the comments to Eq. 7 for details) for a coupled-resonator system which behaves symmetrically (a) or asymmetrically (b). Minimum and maximum joint absorption for structure 1 (c) and structure 2 (d,e). Both structures show coherent perfect absorption and transparency (CPA and CPT), but in the latter those are observed at different x-values, i.e., for different states of external excitation, due to the asymmetric behaviour of the cavity.

Mentions: In Fig. 4(a,b) we plot f±(x), where the choices rξ = 0 and rξ = 0.7 recall the actual values of structures 1 and 2 (see Table 1). The function f− is zero for x = −rξ, which means that the system can always exhibit coherent perfect transparency (CPT) provided that the excitation intensities properly match the intrinsic asymmetry of the photonic resonance. For what concerns CPA, instead, necessary and sufficient condition is that Auni = 1 (and hence /detS/ = 0), and f+ = 1, i.e., x = rξ. In other words, there are two independent requirements: the first on damping rates, detuning, and coupling coefficient (Eq. 6), the second on the symmetry.


Universal lineshapes at the crossover between weak and strong critical coupling in Fano-resonant coupled oscillators.

Zanotto S, Tredicucci A - Sci Rep (2016)

Coherent absorption universal factor f± (see the comments to Eq. 7 for details) for a coupled-resonator system which behaves symmetrically (a) or asymmetrically (b). Minimum and maximum joint absorption for structure 1 (c) and structure 2 (d,e). Both structures show coherent perfect absorption and transparency (CPA and CPT), but in the latter those are observed at different x-values, i.e., for different states of external excitation, due to the asymmetric behaviour of the cavity.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4836300&req=5

f4: Coherent absorption universal factor f± (see the comments to Eq. 7 for details) for a coupled-resonator system which behaves symmetrically (a) or asymmetrically (b). Minimum and maximum joint absorption for structure 1 (c) and structure 2 (d,e). Both structures show coherent perfect absorption and transparency (CPA and CPT), but in the latter those are observed at different x-values, i.e., for different states of external excitation, due to the asymmetric behaviour of the cavity.
Mentions: In Fig. 4(a,b) we plot f±(x), where the choices rξ = 0 and rξ = 0.7 recall the actual values of structures 1 and 2 (see Table 1). The function f− is zero for x = −rξ, which means that the system can always exhibit coherent perfect transparency (CPT) provided that the excitation intensities properly match the intrinsic asymmetry of the photonic resonance. For what concerns CPA, instead, necessary and sufficient condition is that Auni = 1 (and hence /detS/ = 0), and f+ = 1, i.e., x = rξ. In other words, there are two independent requirements: the first on damping rates, detuning, and coupling coefficient (Eq. 6), the second on the symmetry.

Bottom Line: In this article we discuss a model describing key features concerning the lineshapes and the coherent absorption conditions in Fano-resonant dissipative coupled oscillators.The model treats on the same footing the weak and strong coupling regimes, and includes the critical coupling concept, which is of great relevance in numerous applications; in addition, the role of asymmetry is thoroughly analyzed.Due to the wide generality of the model, which can be adapted to various frameworks like nanophotonics, plasmonics, and optomechanics, we envisage that the analytical formulas presented here will be crucial to effectively design devices and to interpret experimental results.

View Article: PubMed Central - PubMed

Affiliation: Istituto Nazionale di Ottica - CNR, Via Nello Carrara 1, 50019 Sesto Fiorentino (FI), Italy.

ABSTRACT
In this article we discuss a model describing key features concerning the lineshapes and the coherent absorption conditions in Fano-resonant dissipative coupled oscillators. The model treats on the same footing the weak and strong coupling regimes, and includes the critical coupling concept, which is of great relevance in numerous applications; in addition, the role of asymmetry is thoroughly analyzed. Due to the wide generality of the model, which can be adapted to various frameworks like nanophotonics, plasmonics, and optomechanics, we envisage that the analytical formulas presented here will be crucial to effectively design devices and to interpret experimental results.

No MeSH data available.


Related in: MedlinePlus