Nonlinear Integrated Optics and All-Optical Waveguide Switching in Semiconductors

Stegeman, George I.; Villeneuve, A.; Aitchison, J. S.; Ironside, C. N.

doi:10.1007/978-94-011-0089-2_28

Cited by 3 publications

(3 citation statements)

References 37 publications

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“…However, materials exist for which the latter restriction may not be satisfied, such as PTS and AlGaAs, in which n 4 ͑perhaps more precisely n 4 tot ) can be of the order of Ϫ100n 2 2 ͑Ref. 23͒ or Ϫ1000n 2 2 , 24 respectively. The cubic-quintic NLS equation may be more relevant for propagation in these materials for which ͉q͉ 2 is much greater than 2 , and can be of unity order or greater.…”

Section: Discussionmentioning

confidence: 99%

Nonparaxial one-dimensional spatial solitons

Blair

2000

Chaos: An Interdisciplinary Journal of Nonlinear Science

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Scalar and vector nonlinear nonparaxial evolution equations are developed for propagation in two-dimensions. Using standard soliton scalings, it is found that nonparaxial propagation is accompanied by higher-order linear and nonlinear terms and an effective quintic nonlinear index. The presence of an intrinsic quintic nonlinearity arising from chi((5)) must also be considered at the order of the analysis. These terms represent corrections to the well-known nonlinear Schrodinger equation. Exact and approximate solutions to these higher-order evolution equations are obtained and are shown to exhibit quasi-soliton behavior based on propagation and collision studies. (c) 2000 American Institute of Physics.

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Section: Discussionmentioning

confidence: 99%

Nonparaxial one-dimensional spatial solitons

Blair

2000

Chaos: An Interdisciplinary Journal of Nonlinear Science

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“…•J -8x 10-" -5x 10--3 [143] " absorption at Xj = A plot of index dispersion over visible to near IR is shown in Figure D velocity 17, = v/n. where c is the speed of light in free-space.…”

Section: DL Properties Of Bulk Fused Silicamentioning

confidence: 99%

Spatial Soliton Interactions for Photonic Switching. Part I

Wagner¹,

Blair²

2000

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SUPPLEMENTARY NOTES Companion report isHigh-bandwidth optical Communications will greatly benefit from optical switches since they could eliminate the optical/electronic conversion. Optical logic gates allowing data regeneration, gain, cascadability, would allow even more complex all-optical routing functions. In this work we report on an in-depth study of an optical logic gates based on spatial and spatio-temporal solitons. Optical solitons that propagate long distances without change, act as the natural carrier of binary data due to their stability to perturbations and intrinsic threshold. The non-diffracting nature of spatial optical solitons lends to their use in a class of angular deflection logic gates in which a weak signal can alter the propagation of a strong pump in order to change the device state from high to low, thereby implementing a controlled inverterwhich is cascadable to produce logically-complete, multi-input NOR.Reduced forms of the multi-dimensional, nonlinear spatio-temporal wave equation are solved numerically to study the spatial collision and dragging interactions between orthogonally-polarized spatial solitons and spatio-temporal solitary waves. These three-terminal angular deflection gates, provide complete logic-level restoration, fanout greater than two with large noise margin, and cascadability. In addition, the spatiotemporal logic gates are expected to have pj switching energies using enhanced nonlinear media, and ps switching times through temporal pipelined operation.

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“…Such optical nanowire structures are capable of providing superior light confinement and are thus ideal for nonlinear optics applications [1]. To date, sub-micron diameter silica waveguides have been fabricated and have been used to observe super-continuum generation [2].…”

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confidence: 99%

Enhanced third order nonlinear effects in AlGaAs nanowires

Iwanow

Stegeman

Christodoulides

et al. 2006

2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference

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We report the first observation of self-phase-modulation enhancement in 500 nm wide, Kerr nonlinear AlGaAs nanowaveguides.The development of single-mode sub-wavelength waveguides (nanowaveguides) is today an issue of great scientific and technological interest. Such optical nanowire structures are capable of providing superior light confinement and are thus ideal for nonlinear optics applications [1]. To date, sub-micron diameter silica waveguides have been fabricated and have been used to observe super-continuum generation [2]. Other nonlinear glasses such as lead silicate, tellurites, and bismuth have also been employed along these lines. In view of the above, it will be certainly of interest to explore the possibility of fabricating such high index-contrast nanowires using highly nonlinear materials such as for example semiconductors. Quite recently we have fabricated and tested prototype AlGaAs optical nanowires. Given the fact that AlGaAs exhibits a nonlinearity that is three orders of magnitude higher than that of silica, the prospect of realizing sub-µm 2 nanowires may eventually lead to low-power nonlinear devices with sub-millimeter interaction lengths. In this paper we report the first observation of spectral broadening (SPM) enhancement in nonlinear AlGaAs nanowires.The nanowires were fabricated by deep etching of a multilayer MBE structure on a GaAs wafer. The structure of each nanowire waveguide (including the tapers) is shown in Fig. 1. The length L of the nanowire was varied from 0 to 700µm in 100µm steps. The nanowire width W for the experiments was set at 500nm. In the vertical direction the structure is as follows: The substrate is GaAs on top of which sequentially was deposited a 4200nm cladding layer of Al 0.7 Ga 0.3 As, a 500nm core of Al 0.2 Ga 0.8 As, a 300nm upper cladding of Al 0.7 Ga 0.3 As and a cap layer of 100nm GaAs. The layer structure was etched down to a depth of 2300nm, (as shown in the SEM picture of Fig. 1), to form a single mode waveguide at 1550 nm. The resulting modal area for the single mode guide was estimated to be ∼0.3µm 2 . Fig. 1: (Left) Single channel as viewed from above; (Right) SEM picture of the nanowire structure.a1438_1.pdf CMA1.pdf 1-55752-813-6/06/$25.00 ©2006 IEEE

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Nonlinear Integrated Optics and All-Optical Waveguide Switching in Semiconductors

Cited by 3 publications

References 37 publications

Nonparaxial one-dimensional spatial solitons

Nonparaxial one-dimensional spatial solitons

Spatial Soliton Interactions for Photonic Switching. Part I

Enhanced third order nonlinear effects in AlGaAs nanowires

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