Self-pulsing nanocavity laser

Yacomotti, A. M.; Haddadi, S.; Barbay, Sylvain

doi:10.1103/physreva.87.041804

Cited by 26 publications

(12 citation statements)

References 28 publications

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“…This is demonstrated in Figures 7a and 7b, which show the laser dynamics for the same system as figures 6a and 6b, except here J = 1.2 J th . We notice here that self-pulsations have been predicted in nanocavities pumped by a strong CW beam [29] and in coupled nanocavity structures, [30] but that the present configuration is significantly different due to the combination of a high quality factor cavity with a strongly localised mode and the open-ended waveguide with an extended mode, although the saturable absorption dynamics have similarities to [30], as demonstrated in the following. A temporary increase in laser power results in a saturation of the cavity absorption, leading to a larger mirror reflection, which in turn provides positive feedback for the laser, resulting in pulse build-up (figs.…”

Section: Self-pulsingsupporting

confidence: 54%

Theory of Self‐pulsing in Photonic Crystal Fano Lasers

Rasmussen

Mørk

2017

Laser & Photonics Reviews

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Laser self‐pulsing was a phenomenon exclusive to macroscopic lasers until recently, where self‐starting laser pulsation in a microscopic photonic crystal Fano laser was reported. In this paper a theoretical model is developed to describe the Fano laser, including descriptions of the highly‐dispersive Fano mirror, the laser frequency and the threshold gain. The model is based upon a combination of conventional laser rate equations and coupled‐mode theory. The dynamical model is used to demonstrate how the laser has two regimes of operation, continuous‐wave output and self‐pulsing, and these regimes are characterised using phase diagrams, establishing the regime of self‐pulsing numerically. Furthermore, the physics behind the self‐pulsing mechanism are explained in detail and it is demonstrated how cavity absorption makes the Fano mirror function as a saturable absorber, leading to Q‐switched pulse generation. A stability analysis is used to demonstrate how the dominant mechanism of instability is relaxation oscillations becoming un‐damped. Finally the effect of varying key self‐pulsing parameters is investigated by characterisation of the change in self‐pulsing regions.

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Section: Self-pulsingsupporting

confidence: 54%

Theory of Self‐pulsing in Photonic Crystal Fano Lasers

Rasmussen

Mørk

2017

Laser & Photonics Reviews

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“…However, the extreme miniaturization enabled by our configuration as well as the Fano resonance adds additional richness and design opportunities. Compared to the theoretical suggestion of coupled-cavity structures for realizing self-pulsing [63], the Fano laser demonstrated here relies on the coupling of a very low Q-factor cavity (semi-open waveguide) and a cavity with much higher Q-factor (the nanocavity), leading to single-mode operation rather than a mode doublet.…”

Section: Self-pulsingmentioning

confidence: 94%

Semiconductor Fano Lasers

Mørk

Rasmussen

et al. 2019

IEEE J. Select. Topics Quantum Electron.

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“…Coupled micro and nanocavities, also called photonic molecules [1], are being investigated with increasing interest due to their relevance in applications such as laser optimization [2], delay lines [3], optical strong coupling [4], optical equivalent of EIT [5], as well as a testbed for the exploration of advanced nonlinear and quantum regimes [6][7][8]. In this context, evanescently coupled optical cavities can be regarded as multiple potential well systems which, in the presence of nonlinearities, may allow the demonstration of fundamental phenomena such as Josephson oscillations, optical self-trapping or even spontaneous symmetry breaking [9,10].…”

Section: Introductionmentioning

confidence: 99%

Photonic molecules: tailoring the coupling strength and sign

Haddadi¹,

Hamel²,

Beaudoin³

et al. 2014

Opt. Express

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We demonstrate a large tuning of the coupling strength in Photonic Crystal molecules without changing the inter-cavity distance. The key element for the design is the "photonic barrier engineering", where the "potential barrier" is formed by the air-holes in between the two cavities. This consists in changing the hole radius of the central row in the barrier. As a result we show, both numerically and experimentally, that the wavelength splitting in two evanescently-coupled Photonic Crystal L3 cavities (three holes missing in the ΓK direction of the underlying triangular lattice) can be continuously controlled up to 5× the initial value upon ∼ 30% of hole-size modification in the barrier. Moreover, the sign of the splitting can be reversed in such a way that the fundamental mode can be either the symmetric or the anti-symmetric one without altering neither the cavity geometry nor the inter-cavity distance. Coupling sign inversion is explained in the framework of a Fabry-Perot model with underlying propagating Bloch modes in coupled W1 waveguides.

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Self-pulsing nanocavity laser

Cited by 26 publications

References 28 publications

Theory of Self‐pulsing in Photonic Crystal Fano Lasers

Theory of Self‐pulsing in Photonic Crystal Fano Lasers

Semiconductor Fano Lasers

Photonic molecules: tailoring the coupling strength and sign

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