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Observations of temporal group delays in slow-light multiple coupled photonic crystal cavities
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View: Figures


Image of FIG. 1.
FIG. 1.

Designed and fabricated L3 coupled cavity system. (a) Simplified model of the system which is consisting of four point-defect cavities in a two-dimensional PC slab. (b) Example of near-infrared top view image of 2 cavities with very close resonant frequencies. (c) field intensity of coupled-cavity transparency mode between two L3 cavities. (d) SEM of the fabricated sample with ; ; and . Each cavity is tuned for high intrinsic . and . Scale bar: . (e) SEM of one of the cavities with higher resolution. Scale bar: .

Image of FIG. 2.
FIG. 2.

Temporal delay measurement setup. The straight lines represent optical fibers and dashed lines are coaxial cables. A high speed electro-optic modulator generates a sinusoidal probe beam of 1 GHz. Two 532 nm continuous wave lasers with a spot size at a cavity and interconnecting waveguide region are used for thermo-optic tuning. Refractive index change is at 300 K and we estimate 16 K temperature rise per milliwatt pump.

Image of FIG. 3.
FIG. 3.

Comparison between couple mode theory calculations and the experimental results. (a) Cavity resonances are not adjusted and there is no transparency window. [(b) and (c)] Three resonances with spectral and phase detuning controlled for transparency peak windows. [(f) and (g)] Measured and theoretical optical delay corresponding to 17.12 ps for (b) and 16.48 and 13.29 ps for [(c), (d), and (h)]. Histograms of the delay values in [(f) and (g)] where the delay values at the transparency frequencies are distinctive over the noise distribution.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Observations of temporal group delays in slow-light multiple coupled photonic crystal cavities