Reducing disorder-induced losses for slow light photonic crystal waveguides through Bloch mode engineering

Mann, Nishan; Combrie, S.; Colman, Pierre; Patterson, Mark; Rossi, Alfredo De; Hughes, Stephen

doi:10.1364/ol.38.004244

Cited by 18 publications

(21 citation statements)

References 27 publications

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“…Although the maximum group index existing at the boundary of the slow region for Δ = 50 nm can reach a value up to 10 4 , the effective flat region is concentrated where the group index is lower than 250. The calculated average region is within 10% around the average group index [14,19]. Group index in this region is calculated and an average value of 192 is obtained, while the normalized bandwidth Δω/ω decreases to 0.0015.…”

Section: Design and Analysismentioning

confidence: 91%

“…Line-defect is one of the most important elements to achieve slow light [15][16][17]. The dispersion of the line-defect PhC waveguide can be engineered by rearrangement of the nearest-neighbour lattice [18][19][20]. Chirped arrangement [21] and introduction of different ring-shaped and ellipse-shaped holes [22,23] have been demonstrated to obtain high delay-bandwidth products.…”

mentioning

confidence: 99%

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Realizing Flexible Ultra-Flat-Band Slow Light in Hybrid Photonic Crystal Waveguides for Efficient Out-of-Plane Coupling

Zhang¹,

Shi²,

He³

2014

PIER

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The realization of slow light with ultra-flat dispersion in hybrid photonic crystal (HPhC) waveguide is systematically investigated. Metal strips have been introduced to the photonic crystal (PhC) waveguide. The dispersion of the odd mode is commendably flattened in the leaky region. Ultra-flat-band slow light with nearly constant average group indices of 192 over 2 nm (i.e., 330 GHz) bandwidth is achieved. Flexible tuning for the ultra-high group index can also be achieved while keeping the normalized delay-bandwidth product fairly high. The introduction of the metal strips is further demonstrated to help reduce the azimuthal angle of the far field and provide a high coupling efficiency.

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Section: Design and Analysismentioning

confidence: 91%

mentioning

confidence: 99%

Realizing Flexible Ultra-Flat-Band Slow Light in Hybrid Photonic Crystal Waveguides for Efficient Out-of-Plane Coupling

Zhang¹,

Shi²,

He³

2014

PIER

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“…1(b)] and −400 fs [ Fig. 1(d)] are reached away from the band edge where propagation losses are reduced [29,30]. The lower linear loss of the latter structures has implications for practical observation of these effects.…”

Section: Self-steepening In Phcwgsmentioning

confidence: 99%

Giant anomalous self-steepening in photonic crystal waveguides

Husko

Colman

2015

Phys. Rev. A

Self Cite

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Self-steepening of optical pulses arises due the dispersive contribution of the χ (3) (ω) Kerr nonlinearity. In typical structures this response is on the order of a few femtoseconds with a fixed frequency response. In contrast, the effective χ (3) Kerr nonlinearity in photonic crystal waveguides (PhCWGs) is largely determined by the geometrical parameters of the structure and is consequently tunable over a wide range. Here we show self-steepening based on group-velocity (group-index) modulation for the first time, giving rise to a new physical mechanism for generating this effect. Further, we demonstrate that periodic media such as PhCWGS can exhibit self-steepening coefficients two orders of magnitude larger than typical systems. At these magnitudes the self-steepening strongly affects the nonlinear pulse dynamics even for picosecond pulses. Due to interaction with additional higher-order nonlinearities in the semiconductor materials under consideration, we employ a generalized nonlinear Schrödinger equation numerical model to describe the impact of self-steepening on the temporal and spectral properties of the optical pulses in practical systems, including new figures of merit. These results provide a theoretical description for recent experimental results presented in [Scientific Reports 3, 1100) and Phys. Rev. A 87, 041802 (2013]. More generally, these observations apply to all periodic media due to the rapid group-velocity variation characteristic of these structures.

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“…Regarding the study of losses in macroporous silicon, work is focused to particular cases. In general, they are about PC waveguides, using in-plane propagation, where losses were mainly attributed to: scattering due to surface roughness [22], impedance mismatch [23], and leakage [24]. An interesting result from the study of PC waveguides, was the development of disorder modes theory [25].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Absorption Losses on the Optical Behaviour of Macroporous Silicon Photonic Crystal Selective Filters

Bru

Maza

Trifonov

et al. 2016

J. Lightwave Technol.

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Reducing disorder-induced losses for slow light photonic crystal waveguides through Bloch mode engineering

Cited by 18 publications

References 27 publications

Realizing Flexible Ultra-Flat-Band Slow Light in Hybrid Photonic Crystal Waveguides for Efficient Out-of-Plane Coupling

Realizing Flexible Ultra-Flat-Band Slow Light in Hybrid Photonic Crystal Waveguides for Efficient Out-of-Plane Coupling

Giant anomalous self-steepening in photonic crystal waveguides

The Effect of Absorption Losses on the Optical Behaviour of Macroporous Silicon Photonic Crystal Selective Filters

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