Controlling free-carrier temporal effects in silicon by dispersion engineering

Blanco‐Redondo, Andrea; Eades, D.; Li, Juntao; Lefrançois, Simon; Krauss, Thomas F.; Eggleton, Benjamin J.; Husko, Chad

doi:10.1364/optica.1.000299

Cited by 31 publications

(27 citation statements)

References 45 publications

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“…Importantly, the physical signatures of anomalous self-steepening strongly resemble those of FCD, especially in the time domain. Namely, like anomalous SS, the pulse also advances as a function of input power due to FCD combined with anomalous GVD as our recent experiments show [22,40].…”

Section: Self-steepening In Semiconductorsmentioning

confidence: 65%

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Giant anomalous self-steepening in photonic crystal waveguides

Husko

Colman

2015

Phys. Rev. A

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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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Section: Self-steepening In Semiconductorsmentioning

confidence: 65%

“…For the modeling below, we take the slow-light-scaled values of the bulk parameters as described in prior literature [36,40]. The parameters are α 3eff = α 3…”

Section: Self-steepening In Semiconductorsmentioning

confidence: 99%

Giant anomalous self-steepening in photonic crystal waveguides

Husko

Colman

2015

Phys. Rev. A

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“…In silicon nonlinear waveguide, in addition to the Kerr effect, twophoton absorption (TPA) generates considerable free-carrier densities, with corresponding nonlinearity and change of refractive index via free-carrier dispersion (FCD) and freecarrier absorption (FCA) [14]. Importantly, the generation of free-carrier density via TPA is already quadratically proportional to the incident laser intensity, making the cascaded refractive index modulation via FCA/FCD a fifth-order nonlinear dynamics on top of the third-order Kerr nonlinearity [16][17][18][19][20][21][22][23][24]. Various FCD/FCA induced nonlinear phenomena have been demonstrated in silicon, such as soliton fission [18,19], soliton compression [20], frequency shift [21], and spectrum broadening [23,24].…”

Section: Introductionmentioning

confidence: 99%

Six‐wave mixing induced by free‐carrier plasma in silicon nanowire waveguides

Zhou

Liao

Huang

et al. 2016

Laser & Photonics Reviews

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Nonlinear wave-mixing in mesoscopic silicon structures is a fundamental nonlinear process with broad impact and applications. Silicon nanowire waveguides, in particular, have large third-order Kerr nonlinearity, enabling salient and abundant four-wave mixing dynamics and functionalities. Besides Kerr effect, in silicon waveguide two-photon absorption generates high free-carrier densities, with corresponding fifth-order nonlinearity in the forms of free-carrier dispersion and free-carrier absorption. However, whether these fifth-order free carrier nonlinear effects can lead to six-wave mixing dynamics still remains an open question until now. Here, we report the first demonstration of free-carrier induced six-wave mixing in silicon nanowires. Unique features including inverse detuning dependence of sixwave mixing efficiency, and its higher sensitivity to pump power, are originally observed and verified by analytical prediction and numerical modeling. Additionally, asymmetric sideband generation is observed for different laser detunings, resulting from the phase-sensitive interactions between free-carrier six-wave mixing and Kerr four-wave mixing dynamics. These discoveries provide a new path for nonlinear multi-wave interactions in nanoscale platforms.

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“…In the optical domain a temporal soliton can form from the controlled balance of the nonlinear Kerr effect with linear group-velocity dispersion (GVD). 6 These free-carrier effects also interplay with and modulate the classical soliton evolution. 2 The nonlinear absorption attenuates the peak power, restricting the desirable nonlinear phase change due to the Kerr effect.…”

Section: Introductionmentioning

confidence: 99%

Soliton dynamics in semiconductor photonic crystals

et al. 2016

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Semiconductor optical waveguides have been the subject of intense study as both fundamental objects of study, as well as a path to photonic integration. In this talk I will focus on the nonlinear evolution of optical solitons in photonic crystal waveguides made of semiconductor materials. The ability to independently tune the dispersion and the nonlinearity in photonic crystal waveguides enables the examination of completely different nonlinear regimes in the same platform. I will describe experimental efforts utilizing time-resolved measurements to reveal a number of physical phenomena unique to solitons in a free carrier medium. The experiments are supported by analytic and numerical models providing a deeper insight into the physical scaling of these processes. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/15/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/15/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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Controlling free-carrier temporal effects in silicon by dispersion engineering

Cited by 31 publications

References 45 publications

Giant anomalous self-steepening in photonic crystal waveguides

Giant anomalous self-steepening in photonic crystal waveguides

Six‐wave mixing induced by free‐carrier plasma in silicon nanowire waveguides

Soliton dynamics in semiconductor photonic crystals

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