Dynamic band collapse in photonic graphene

Crespi, Andrea; Corrielli, Giacomo; Valle, Giuseppe Della; Osellame, Roberto; Longhi, Stefano

doi:10.1088/1367-2630/15/1/013012

Cited by 80 publications

(39 citation statements)

References 46 publications

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“…This band structure leads to interesting bulk and edge transport phenomena [179], and the flatband results in non-diffracting states, which have recently been observed [180,181]. Using hexagonal waveguide arrays, the structure of graphene has been extensively studied, such as the influence of strain resulting in Landau levels [182], compression of the lattice [183], the influence of disorder on the edge states [184] as well as the band collapse under the influence of an external field [185]. Furthermore, a previously unknown edge state of graphene has been discovered using a honeycomb photonic lattice [186].…”

Section: Physics In 2d Waveguide Arraysmentioning

confidence: 99%

Ultrafast-laser-inscribed 3D integrated photonics: challenges and emerging applications

2015

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Since the discovery that tightly focused femtosecond laser pulses can induce a highly localised and permanent refractive index modification in a large number of transparent dielectrics, the technique of ultrafast laser inscription has received great attention from a wide range of applications. In particular, the capability to create three-dimensional optical waveguide circuits has opened up new opportunities for integrated photonics that would not have been possible with traditional planar fabrication techniques because it enables full access to the many degrees of freedom in a photon. This paper reviews the basic techniques and technological challenges of 3D integrated photonics fabricated using ultrafast laser inscription as well as reviews the most recent progress in the fields of astrophotonics, optical communication, quantum photonics, emulation of quantum systems, optofluidics and sensing.

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Section: Physics In 2d Waveguide Arraysmentioning

confidence: 99%

Ultrafast-laser-inscribed 3D integrated photonics: challenges and emerging applications

2015

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“…99,100 The use of honeycomb lattices with helical modulation allows for the simulation of graphene physics; e.g. band collapse, 101 and topological insulators.…”

Section: 98mentioning

confidence: 99%

Quantum optics as a tool for photonic lattice design

2015

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“…ϕ = 0, we bend the waveguide axis in both x and y directions along the paraxial propagation distance t, so that the optical axis of the array describes a curved path with parametric equations x = x 0 (t) and y = y 0 (t). Arrays of waveguides with arbitrarily curved axis in threedimensions can be realized, for example, by the technique of femtosecond laser writing in optical glasses (see, for instance, [56]). In the tight-binding and paraxial approximations, light transport in the superlattice with a bent axis is governed by the following coupled-mode equations (see, for instance, [57])…”

Section: The Modelmentioning

confidence: 99%

Convective and absolutePT-symmetry breaking in tight-binding lattices

Longhi

2013

Phys. Rev. A

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We investigate the onset of parity-time (PT ) symmetry breaking in non-Hermitian tight-binding lattices with spatially-extended loss/gain regions in presence of an advective term. Similarly to the instability properties of hydrodynamic open flows, it is shown that PT symmetry breaking can be either absolute or convective. In the former case, an initially-localized wave packet shows a secular growth with time at any given spatial position, whereas in the latter case the growth is observed in a reference frame moving at some drift velocity while decay occurs at any fixed spatial position. In the convective unstable regime, PT symmetry is restored when the spatial region of gain/loss in the lattice is limited (rather than extended). We consider specifically a non-Hermitian extension of the Rice-Mele tight binding lattice model, and show the existence of a transition from absolute to convective symmetry breaking when the advective term is large enough. An extension of the analysis to ac-dc-driven lattices is also presented, and an optical implementation of the non-Hermitian RiceMele model is suggested, which is based on light transport in an array of evanescently-coupled optical waveguides with a periodically-bent axis and alternating regions of optical gain and loss.

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Dynamic band collapse in photonic graphene

Cited by 80 publications

References 46 publications

Ultrafast-laser-inscribed 3D integrated photonics: challenges and emerging applications

Ultrafast-laser-inscribed 3D integrated photonics: challenges and emerging applications

Quantum optics as a tool for photonic lattice design

Convective and absolutePT-symmetry breaking in tight-binding lattices

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