Limits...
Observation of optical solitons in PT-symmetric lattices.

Wimmer M, Regensburger A, Miri MA, Bersch C, Christodoulides DN, Peschel U - Nat Commun (2015)

Bottom Line: Quite recently, notions of parity-time (PT) symmetry have been suggested in photonic settings as a means to enforce stable energy flow in platforms that simultaneously employ both amplification and attenuation.Unlike other non-conservative nonlinear arrangements where self-trapped states appear as fixed points in the parameter space of the governing equations, discrete PT solitons form a continuous parametric family of solutions.The possibility of synthesizing PT-symmetric saturable absorbers, where a nonlinear wave finds a lossless path through an otherwise absorptive system is also demonstrated.

View Article: PubMed Central - PubMed

Affiliation: 1] Institute of Optics, Information and Photonics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 7/B2, 91058 Erlangen, Germany [2] Erlangen Graduate School in Advanced Optical Technologies (SAOT), 91058 Erlangen, Germany.

ABSTRACT
Controlling light transport in nonlinear active environments is a topic of considerable interest in the field of optics. In such complex arrangements, of particular importance is to devise strategies to subdue chaotic behaviour even in the presence of gain/loss and nonlinearity, which often assume adversarial roles. Quite recently, notions of parity-time (PT) symmetry have been suggested in photonic settings as a means to enforce stable energy flow in platforms that simultaneously employ both amplification and attenuation. Here we report the experimental observation of optical solitons in PT-symmetric lattices. Unlike other non-conservative nonlinear arrangements where self-trapped states appear as fixed points in the parameter space of the governing equations, discrete PT solitons form a continuous parametric family of solutions. The possibility of synthesizing PT-symmetric saturable absorbers, where a nonlinear wave finds a lossless path through an otherwise absorptive system is also demonstrated.

No MeSH data available.


Linear propagation in a PT-symmetric lattice.The band structure (a) above (G=1.4,ϕ0=0) and (b) below (G=1.4,ϕ0=0.4π) the PT threshold (real part in black and imaginary part in red). When a single position is excited the wavepacket spreading occurs that either experiences amplification in the broken regime (c,e) or remains neutral below threshold (d,f). The power is ∼13 mW.
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f4: Linear propagation in a PT-symmetric lattice.The band structure (a) above (G=1.4,ϕ0=0) and (b) below (G=1.4,ϕ0=0.4π) the PT threshold (real part in black and imaginary part in red). When a single position is excited the wavepacket spreading occurs that either experiences amplification in the broken regime (c,e) or remains neutral below threshold (d,f). The power is ∼13 mW.

Mentions: Figure 4a,b depict this dispersion relation for two different values of (ϕ0,G). Evidently, in this configuration, the eigenvalues θ are completely real in certain regions of the parameter map spanned by ϕ0 and G (below PT threshold), and become complex above the PT-symmetry-breaking threshold1151 (see Supplementary Fig. 11).


Observation of optical solitons in PT-symmetric lattices.

Wimmer M, Regensburger A, Miri MA, Bersch C, Christodoulides DN, Peschel U - Nat Commun (2015)

Linear propagation in a PT-symmetric lattice.The band structure (a) above (G=1.4,ϕ0=0) and (b) below (G=1.4,ϕ0=0.4π) the PT threshold (real part in black and imaginary part in red). When a single position is excited the wavepacket spreading occurs that either experiences amplification in the broken regime (c,e) or remains neutral below threshold (d,f). The power is ∼13 mW.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4525206&req=5

f4: Linear propagation in a PT-symmetric lattice.The band structure (a) above (G=1.4,ϕ0=0) and (b) below (G=1.4,ϕ0=0.4π) the PT threshold (real part in black and imaginary part in red). When a single position is excited the wavepacket spreading occurs that either experiences amplification in the broken regime (c,e) or remains neutral below threshold (d,f). The power is ∼13 mW.
Mentions: Figure 4a,b depict this dispersion relation for two different values of (ϕ0,G). Evidently, in this configuration, the eigenvalues θ are completely real in certain regions of the parameter map spanned by ϕ0 and G (below PT threshold), and become complex above the PT-symmetry-breaking threshold1151 (see Supplementary Fig. 11).

Bottom Line: Quite recently, notions of parity-time (PT) symmetry have been suggested in photonic settings as a means to enforce stable energy flow in platforms that simultaneously employ both amplification and attenuation.Unlike other non-conservative nonlinear arrangements where self-trapped states appear as fixed points in the parameter space of the governing equations, discrete PT solitons form a continuous parametric family of solutions.The possibility of synthesizing PT-symmetric saturable absorbers, where a nonlinear wave finds a lossless path through an otherwise absorptive system is also demonstrated.

View Article: PubMed Central - PubMed

Affiliation: 1] Institute of Optics, Information and Photonics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 7/B2, 91058 Erlangen, Germany [2] Erlangen Graduate School in Advanced Optical Technologies (SAOT), 91058 Erlangen, Germany.

ABSTRACT
Controlling light transport in nonlinear active environments is a topic of considerable interest in the field of optics. In such complex arrangements, of particular importance is to devise strategies to subdue chaotic behaviour even in the presence of gain/loss and nonlinearity, which often assume adversarial roles. Quite recently, notions of parity-time (PT) symmetry have been suggested in photonic settings as a means to enforce stable energy flow in platforms that simultaneously employ both amplification and attenuation. Here we report the experimental observation of optical solitons in PT-symmetric lattices. Unlike other non-conservative nonlinear arrangements where self-trapped states appear as fixed points in the parameter space of the governing equations, discrete PT solitons form a continuous parametric family of solutions. The possibility of synthesizing PT-symmetric saturable absorbers, where a nonlinear wave finds a lossless path through an otherwise absorptive system is also demonstrated.

No MeSH data available.