Direct measurement of second-order coupling in a waveguide lattice

Abstract

We measure the next-nearest-neighbour coupling in an array of coupled optical waveguides directly via an integrated eigenmode interferometer. In contrast to light propagation experiments, the technique is insensitive to nearest-neighbour dynamics. Our results show that second-order coupling in a linear configuration can be suppressed well below the level expected from the exponential decay of the guided modes.

Accepted by Applied Physics Letters. After publication, it will be found at http://scitation.aip.org/content/aip/journal/apl

References in corpus (5)

• Quantum walks of correlated particles
• Realization of quantum walks with negligible decoherence in waveguide lattices
• Coherent Quantum Transport in Photonic Lattices
• Tuneable quantum interference in a 3D integrated circuit
• Non-classical interference in integrated 3D multiports

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• Interdimensional optical isospectrality inspired by graph networks
• Existence of a negative next-nearest-neighbor coupling in evanescently coupled dielectric waveguides
• Quantum Slide and NAND Tree on a Photonic Chip
• Symmetry-protected non-Abelian geometric phases in optical waveguides with nonorthogonal modes
• $\mathcal{P}\mathcal{T}$-like phase transitions from square roots of supersymmetric Hamiltonians