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Publication :
Slow light in subwavelength grating waveguides

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Date

2019-08-07

Direction de publication

Direction de recherche

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Éditeur

IEEE

Projets de recherche

Structures organisationnelles

Numéro de revue

Résumé

Structural slow light is the dispersion engineering process by which the group velocity of light can be drastically reduced in a periodic waveguide structure. Enabling large group delay and enhancing the light-matter interaction on a subwave- length scale, on-chip slow light is of great interest in a vast array of fields such as non-linear optic, sensing, laser physics, telecommunication and computing. In this work, we experimen- tally demonstrate, for the first time, slow light in subwavelength grating waveguides on the silicon-on-insulator platform. We present a comprehensive numerical study in analytical modelling and 3D FDTD. Multiple waveguides variations were fabricated using an electron-beam lithography process. Figures of merit such as group index, bandwidth and loss-per-delay are examined in both theory and experiment. A maximum measured group index of 47.74 with a loss-per-delay of 103.37 dB/ns has been achieved near the wavelength of 1550 nm. A broad bandwidth of 8.82 nm was measured, in which the group index remains larger than 10. We also show that the region of slow light operation can be shifted over a large wavelength span by controlling a single design parameter.

Description

Revue

IEEE Journal of Selected Topics in Quantum Electronics, (2019)

DOI

10.1109/JSTQE.2019.2933788

URL vers la version publiée

Mots-clés

Slow light, Optical waveguides, Indexes, Dispersion, Bandwidth, Analytical models, Silicon, Lumière lente

Citation

Licence CC

Type de document