Optically Induced Indirect Photonic Transitions in a Slow Light Photonic Crystal Waveguide

Muñoz, Michel Castellanos; Petrov, Alexander Yu.; O’Faoláin, Liam; Li, Juntao; Krauss, Thomas F.; Eich, Manfred

doi:10.1103/physrevlett.112.053904

Cited by 47 publications

(50 citation statements)

References 27 publications

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“…4a the schematic band diagram of the transition is presented for the case when switching pulse is faster than the signal. As theoretically predicted [11] the transition takes place from the original point in the band diagram to a point on the band with changed refractive index along the line which has a slope of the switching pulse group velocity. Thus an indirect transition is obtained where not only the frequency but also the wavevector of the signal is changed.…”

Section: Indirect Transitionmentioning

confidence: 59%

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Dynamic frequency shift in photonic crystal resonators and slow light waveguides

O’Faoláin

Muñoz

Petrov

et al. 2015

2015 17th International Conference on Transparent Optical Networks (ICTON)

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The dynamic frequency shift of the optical pulse can be obtained if the refractive index of the guiding structure is switched while the pulse is inside the structure. We have developed a co-propagating scheme where switching is obtained by a second pulse which generates free carriers into a silicon waveguide and thus shifts refractive index by up to 0.01. The interaction was studied in two systems. First, system based on a photonic crystal heterostructure cavity was considered which was excited at the resonance frequency by the signal and then switched by the second pulse at the frequency of the pass band. In the second system two pulses were propagating in a slow light waveguide. Two pulses with different group velocities could overtake each other inside the structure. In both system theoretical models were developed to explain expected frequency shifts and compared to the experiment.

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Section: Indirect Transitionmentioning

confidence: 59%

“…Here we present the experiments of the direct and indirect transitions through the signal pulse interaction with a switching pulse co-propagating in the photonic crystal structures [3,11,12]. The refractive index is shifted by optically generated free carriers.…”

Section: Introductionmentioning

confidence: 99%

Dynamic frequency shift in photonic crystal resonators and slow light waveguides

O’Faoláin

Muñoz

Petrov

et al. 2015

2015 17th International Conference on Transparent Optical Networks (ICTON)

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“…We have, for the first time, experimentally demonstrated indirect photonic transitions that are driven by a refractive index front travelling along a slow-light photonic crystal waveguide [20]. Fig.…”

Section: Frequency Shift In Slow Light Waveguidesmentioning

confidence: 99%

“…Its final frequency and wave vector (ω 2 , k 2 ) are determined graphically from the crossing point of the grey phase continuity line and the upper dashed dispersion curve. [20]. A switching pulse with high peak power generates free carriers in the silicon by two-photon absorption and consequently induces a change of refractive index whose front propagates with the velocity of the switching pulse.…”

Section: Theory Of Indirect Transition With Moving Frontmentioning

confidence: 99%

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Indirect transitions of a signal interacting with a moving refractive index front

Muñoz

Petrov

O’Faoláin

et al. 2014

Active Photonic Materials VI

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The dynamic manipulation of light can be achieved by the interaction of a signal pulse propagating through or reflected from a refractive index front. Both the frequency and the wave vector of the signal are changed in this case, which is generally referred to as an indirect transition. We have developed a theory to describe such transitions in integrated photonic crystal waveguides. Through indirect transitions, the following effects can be envisaged: large frequency shifts and light stopping and order of magnitude pulse compression and broadening without center frequency shift. All effects can be potentially realized with a refractive index modulation as small as 0.001.For the experimental realization, we have used slow light photonic crystal waveguides in silicon. The refractive index front was obtained by free carriers generation with a switching pulse co-propagating with the signal in the same slow light waveguide. The group velocities of the signal and the front could be varied arbitrarily by choosing the right frequencies of the signal and switching pulses. The indirect transition was unambiguously demonstrated by considering two situations: a) the front overtaking the signal and b) the signal overtaking the front. In both cases, a blue shift of the signal frequency was observed. This blue shift can only be explained by the occurrence of the expected indirect transition and not by a direct transition without wave vector variation.

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Nonreciprocal transmission in a nonlinear photonic-crystal Fano structure with broken symmetry

Chen

et al. 2015

Laser & Photonics Reviews

143

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Nanostructures that feature nonreciprocal light transmission are highly desirable building blocks for realizing photonic integrated circuits. Here, a simple and ultracompact photonic‐crystal structure, where a waveguide is coupled to a single nanocavity, is proposed and experimentally demonstrated, showing very efficient optical diode functionality. The key novelty of the structure is the use of cavity‐enhanced material nonlinearities in combination with spatial symmetry breaking and a Fano resonance to realize nonreciprocal propagation effects at ultralow power and with good wavelength tunability. The nonlinearity of the device relies on ultrafast carrier dynamics, rather than the thermal effects usually considered, allowing the demonstration of nonreciprocal operation at a bit‐rate of 10 Gbit s−1 with a low energy consumption of 4.5 fJ bit−1.

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Optically Induced Indirect Photonic Transitions in a Slow Light Photonic Crystal Waveguide

Cited by 47 publications

References 27 publications

Dynamic frequency shift in photonic crystal resonators and slow light waveguides

Dynamic frequency shift in photonic crystal resonators and slow light waveguides

Indirect transitions of a signal interacting with a moving refractive index front

Nonreciprocal transmission in a nonlinear photonic-crystal Fano structure with broken symmetry

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