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Observation of accelerating Airy beams.
TLDR
This work reports the first observation of Airy optical beams, a class of wave packets that can exhibit unusual features such as the ability to remain diffraction-free over long distances while they tend to freely accelerate during propagation.
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Observation of parity–time symmetry in optics
One of the fundamental axioms of quantum mechanics is associated with the Hermiticity of physical observables 1 . In the case of the Hamiltonian operator, this requirement not only implies real…
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Accelerating finite energy Airy beams.
We investigate the acceleration dynamics of quasi-diffraction-free Airy beams in both one- and two-dimensional configurations. We show that this class of finite energy waves can retain their…
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Observation of PT-symmetry breaking in complex optical potentials.
TLDR
This work demonstrates experimentally passive PT-symmetry breaking within the realm of optics, which leads to a loss induced optical transparency in specially designed pseudo-Hermitian guiding potentials.
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Unidirectional invisibility induced by PT-symmetric periodic structures.
TLDR
Parity-time (PT) symmetric periodic structures, near the spontaneous PT-symmetry breaking point, can act as unidirectional invisible media and the transmission coefficient and phase are indistinguishable from those expected in the absence of a grating.
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Discrete Solitons in Optics
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Discrete self-focusing in nonlinear arrays of coupled waveguides.
We show that a nonlinear array of coupled waveguides can exhibit discrete self-focusing that in the continuum approximation obeys the so-called nonlinear Schrödinger equation. This process has much…
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Enhanced sensitivity at higher-order exceptional points
TLDR
Higher-order exceptional points are observed in a coupled cavity arrangement—specifically, a ternary, parity–time-symmetric photonic laser molecule—with a carefully tailored gain–loss distribution and it is found that the frequency response follows a cube-root dependence on induced perturbations in the refractive index.
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Parity–time synthetic photonic lattices
TLDR
The experimental observation of light transport in large-scale temporal lattices that are parity–time symmetric is reported and it is demonstrated that periodic structures respecting this symmetry can act as unidirectional invisible media when operated near their exceptional points.
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Discretizing light behaviour in linear and nonlinear waveguide lattices
TLDR
Light propagating in linear and nonlinear waveguide lattices exhibits behaviour characteristic of that encountered in discrete systems, which can be exploited to achieve diffraction-free propagation and minimize the power requirements for nonlinear processes.
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