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Proceedings Paper

Front induced transitions: refractive index fronts in dispersive waveguides
Author(s): Mahmoud A. Gaafar; Hagen Renner; Toshihiko Baba; Manfred Eich; Alexander Yu. Petrov
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Paper Abstract

Moving refractive index fronts in waveguides with dispersion is a special type of spatio-temporal modulation leading to the change of signal frequency and wavenumber. The interaction of light with such fronts allows frequency conversion, light stopping, optical delays as well as bandwidth and pulse duration manipulation. We will present theoretical and experimental examples of signal transmission, reflection and trapping by the front and highlight special situations such as light stopping, time reversal or optical push broom effect. We will geometrically consider indirect transitions in the dispersion relation using the phase continuity relation at the front and present numerical solutions of the linear Schrödinger equation which follows from the slowly varying envelope approximation of the wave equation. In particular, for highly dispersive waveguides a temporal evolution of the spatial wave envelopes are considered in contrast to conventional spatial evolution of temporal envelopes. Further, we will present an overview of experimental results and estimate the maximal achievable effects for each of the application in different waveguide systems.

Paper Details

Date Published: 14 April 2020
PDF: 8 pages
Proc. SPIE 11358, Nonlinear Optics and its Applications 2020, 113581H (14 April 2020); doi: 10.1117/12.2555751
Show Author Affiliations
Mahmoud A. Gaafar, Hamburg Univ. of Technology (Germany)
Menoufia Univ. (Egypt)
Hagen Renner, Hamburg Univ. of Technology (Germany)
Toshihiko Baba, Yokohama National Univ. (Japan)
Manfred Eich, Hamburg Univ. of Technology (Germany)
Helmholtz-Zentrum Geesthacht (Germany)
Alexander Yu. Petrov, Hamburg Univ. of Technology (Germany)
ITMO Univ. (Russian Federation)

Published in SPIE Proceedings Vol. 11358:
Nonlinear Optics and its Applications 2020
Neil G. R. Broderick; John M. Dudley; Anna C. Peacock, Editor(s)

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