Controllable low-loss slow light in photonic crystals

Schulz, Sebastian A.; Hu, Chengchen; Upham, Jeremy; Boyd, Robert W.; O’Faoláin, Liam

doi:10.1117/12.2290240

Cited by 1 publication

(1 citation statement)

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“…Various loss reduction methods have been used to enable loss-per-delay in the range of 100 dB/ns with the current state-of-the-art for PhCW reaching values as low as 25 dB/ns [7]. Another approach using coupled PhC cavity recently achieved a record low LD of 15 dB/ns [30]. The loss-per-delay of the SWG #1 with ⇤ = 347 nm is shown in Fig.…”

Section: Slow Light Lossmentioning

confidence: 99%

Slow Light in Subwavelength Grating Waveguides

Jean

Gervais

LaRochelle

et al. 2020

IEEE J. Select. Topics Quantum Electron.

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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 subwavelength 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 experimentally 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.

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Section: Slow Light Lossmentioning

confidence: 99%