Demonstration of various low group velocity effects in photonic crystal line defect waveguides by laser oscillation

Kiyota, Kazuaki; Kise, Tomofumi; Yokouchi, N.; Ide, T.; Baba, Toshihiko

doi:10.1109/leos.2005.1548007

Cited by 9 publications

(11 citation statements)

References 6 publications

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“…Spontaneous emission enhancement was observed in PhC wires 19 and dielectric multilayers with oxygen vacancies as light emitters 20 , and may be used to increase the spontaneous emission factor of a waveguide 9 . Early measurements on lasers employing PhC waveguides 21,22 and coupled resonator structures 23 show that the lasing characteristics are improved using slow-light effects. However, as both the cavity quality factor and the spatial gain coefficient may be affected by slow-light propagation, laser measurements cannot easily distinguish between the two effects.…”

mentioning

confidence: 99%

Slow-light-enhanced gain in active photonic crystal waveguides

Lunnemann

Chen

et al. 2014

Nat Commun

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Passive photonic crystals have been shown to exhibit a multitude of interesting phenomena, including slow-light propagation in line-defect waveguides. It was suggested that by incorporating an active material in the waveguide, slow light could be used to enhance the effective gain of the material, which would have interesting application prospects, for example enabling ultra-compact optical amplifiers for integration in photonic chips. Here we experimentally investigate the gain of a photonic crystal membrane structure with embedded quantum wells. We find that by solely changing the photonic crystal structural parameters, the maximum value of the gain coefficient can be increased compared with a ridge waveguide structure and at the same time the spectral position of the peak gain be controlled. The experimental results are in qualitative agreement with theory and show that gain values similar to those realized in state-of-the-art semiconductor optical amplifiers should be attainable in compact photonic integrated amplifiers.

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mentioning

confidence: 99%

Slow-light-enhanced gain in active photonic crystal waveguides

Lunnemann

Chen

et al. 2014

Nat Commun

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“…It has many potential applications in the areas of optical delay lines [1][2][3], ultrafast all-optical signal processing [4][5][6], quantum computing [7,8], and nonlinear optical devices [9][10][11]. Photonic crystal, particularly constructed in a silicon-on-insulator slab, is among the most optimal structures for achieving slow light in a waveguide formation [12].…”

Section: Introductionmentioning

confidence: 99%

Slow light with large group index–bandwidth product in ellipse-hole photonic crystal waveguides

et al. 2015

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In this study, we propose a new type of slow light photonic crystal waveguide structure to achieve wideband slow light with low dispersion. The waveguide is based on a triangular lattice ellipse-hole photonic crystal imposed simply by a selective altering of the locations of the holes adjacent to the line defect. Under a constant group index criterion of ±10% variation, when group indices are nearly constants of 54, 69, and 80, their corresponding bandwidths of the flat band reach 12.7, 10.0, and 8.6 nm around 1550 nm, respectively. A nearly constant large group index-bandwidth product of 0.44 is achieved for all cases. Low dispersion slow light propagation is confirmed by studying the relative temporal pulse-width spreading with the two-dimensional finite-difference time-domain method.

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“…Slow light has recently regained vitality for its extensive potential applications, such as ultrafast alloptical signal processing [1], quantum computing [2,3], and enhancement of light-matter interactions [4]. A photonic crystal, particularly constructed in a silicon-on-insulator (SOI) slab, is among the most optimal structures for achieving slow light in a waveguide formation [5].…”

Section: Introductionmentioning

confidence: 99%

Wideband slow light with low dispersion in asymmetric slotted photonic crystal waveguides

et al. 2013

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A new procedure of designing slotted photonic crystal waveguides is proposed to achieve slow light with improved normalized delay-bandwidth product and low group velocity dispersion that is suitable for both the W1 defect mode and the slot mode. The lateral symmetry of the waveguide in our study is broken by shifting the air holes periodically along the slot axis. The conversion of the "flat band" from band-up slow light to band-down slow light is achieved for the W1 defect mode. The group index curves of the W1 mode change from U-like to step-like and the group indices of 47, 67 and 130 are obtained with the bandwidth over 7.2, 4.8, and 2.3 nm around 1550 nm, respectively. We also obtain the group indices of 42, 55, and 108 for the slot mode with the bandwidth over 6.2, 5.6, and 2.2 nm, respectively. Then the low dispersion slow light propagation is numerically demonstrated by the finite-difference time-domain method.

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Demonstration of various low group velocity effects in photonic crystal line defect waveguides by laser oscillation

Cited by 9 publications

References 6 publications

Slow-light-enhanced gain in active photonic crystal waveguides

Slow-light-enhanced gain in active photonic crystal waveguides

Slow light with large group index–bandwidth product in ellipse-hole photonic crystal waveguides

Wideband slow light with low dispersion in asymmetric slotted photonic crystal waveguides

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