2016
DOI: 10.1103/physrevlett.117.193901
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Metawaveguide for Asymmetric Interferometric Light-Light Switching

Abstract: Light-light switching typically requires strong nonlinearity where intense laser fields route and direct data flows of weak power, leading to a high power consumption that limits its practical use. Here we report an experimental demonstration of a metawaveguide that operates exactly in the opposite way in a linear regime, where an intense laser field is interferometrically manipulated on demand by a weak control beam with a modulation extinction ratio up to approximately 60 dB. This asymmetric control results … Show more

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Cited by 61 publications
(52 citation statements)
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“…6c). Such asymmetric switching has been experimentally demonstrated in a periodically modulated Si waveguide, with observed extinction ratios of up to 60 dB for a 3:1 intensity ratio between signal and control beam [142].…”
Section: Applicationsmentioning
confidence: 96%
See 1 more Smart Citation
“…6c). Such asymmetric switching has been experimentally demonstrated in a periodically modulated Si waveguide, with observed extinction ratios of up to 60 dB for a 3:1 intensity ratio between signal and control beam [142].…”
Section: Applicationsmentioning
confidence: 96%
“…An optical-frequency CPA was realized with a 2D periodic array of metallic nanopyramids on a silica substrate, and used to demonstrate coherent control over the photoluminescence intensity of a dye layer covering the nanoantennas [148]. Also, because coherent absorption experiments involve a delicate interplay between geometry, material absorption and incident waveform, they may provide a useful technique for non-destructive measurements of material absorptivity and other sample characteristics [48,142].…”
Section: Applicationsmentioning
confidence: 99%
“…-symmetric structures exhibit strongly asymmetric reflection when operating near the exceptional point [73], [390]. This behavior can be exploited for asymmetric interferometric light-light switching [391] and one-sided perfect absorption [392]. In [391], a -symmetric metawaveguide was realized to operate close to the exceptional point, where strong reflection asymmetry allowed for a CPA eigenmode with strongly asymmetric incidence.…”
Section: -Symmetry and Exceptional Pointsmentioning
confidence: 99%
“…Asymmetric light propagation in this passive system is associated with the fact that EPs exist in a larger family of non-Hermitian Hamiltonians [34]. Using a similar method, Feng et al proposed a passive PT-symmetric metawaveguide on an SOI platform for asymmetric interferometric light-light switching with a weak control beam, which enables coherent perfect absorption of a strong signal beam, based on the asymmetric reflection of the metawaveguide near the EP [69]. The high ratio between the strong signal beam and the weak control beam is in contrast to previous approaches of controlling light in all-optical active devices [22,23,[70][71][72][73][74] and is promising for low-power next-generation optical networks.…”
Section: Unidirectional Reflectionless Propagation In Pt-symmetric Symentioning
confidence: 99%