Criterion for Removing a Delayed Peak from the Ultrafast Nonlinear Response of Photonic Crystal / Quantum Dot Waveguides

Salleras, Ferran; Honma, Mareki; Shen, Jun; Ueno, Yuichiro; Ozaki, Nobuhiko; Kitagawa, Yoshinori; Asakawa, Kiyoshi; Ikeda, Naoki; Sugimoto, Yoshimasa

doi:10.1364/np.2007.ntuc6

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Onl-induced Phase Shift1

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2008

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“…Thus, the operation of PC-SMZ in the TPA range should also be avoided in this sense. 11) Next, the typical recovery time of the phase shift in the experiment was approximately 120 ps, as shown in Fig. 5(a).…”

Section: Onl-induced Phase Shiftmentioning

confidence: 92%

Optical-Nonlinearity-Induced Phase Shift via Selective-Area Grown InAs Quantum Dots in a Photonic Crystal Waveguide

Kitagawa

Ozaki

Takata

et al. 2008

jjap

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The selective-area growth (SAG) of InAs quantum dots (QDs) in a GaAs two-dimensional photonic crystal waveguide (2DPC-WG) slab was performed by a metal-mask molecular beam epitaxy (MBE) method, and phase shifts induced by an optical nonlinearity (ONL) of the QD were characterized by two-color pump and probe measurements. The phase shift is caused by the refractive index change (Án) in the PC-WG, while the Án is induced by the absorption saturation as a third-order ONL effect of the QD. For the samples with different SAG-QD lengths, it was confirmed that the phase shift is proportional to the length of the SAG area and to the pump energy. For application to the PC/QD-based symmetrical Mach-Zehnder (SMZ)-type all-optical switch, that is, PC-SMZ, a bright prospect for the design criterion was obtained such that the 180 phase shift, necessary for the PC-SMZ, can be achieved using the four-stacked-layer-QD WG with a 250 mm length at a pump energy of 100 fJ if a slow light with a group velocity of 0:05c (c is the light velocity in vacuum) is used.

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Section: Onl-induced Phase Shiftmentioning

confidence: 92%

Optical-Nonlinearity-Induced Phase Shift via Selective-Area Grown InAs Quantum Dots in a Photonic Crystal Waveguide

Kitagawa

Ozaki

Takata

et al. 2008

jjap

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Criterion for Removing a Delayed Peak from the Ultrafast Nonlinear Response of Photonic Crystal / Quantum Dot Waveguides

Abstract: Two photon absorption accompanied by a 25-ps-delayed nonlinear response was observed in nonlinear photonic crystal/quantum dot waveguides. Criterion for preventing such a delay time is studied for applications in ultrafast all-optical gates.

Cited by 1 publication

References 8 publications

Optical-Nonlinearity-Induced Phase Shift via Selective-Area Grown InAs Quantum Dots in a Photonic Crystal Waveguide

Optical-Nonlinearity-Induced Phase Shift via Selective-Area Grown InAs Quantum Dots in a Photonic Crystal Waveguide

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