24 February 2009 Self imaging in segmented waveguide arrays
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Abstract
Self-imaging in integrated optical devices is interesting for many applications including image transmission, optical collimation and even reshaping of ultrashort laser pulses. However, in general this relies on boundary-free light propagation, since interaction with boundaries results in a considerable distortion of the self-imaging effect. This problem can be overcome in waveguide arrays by segmentation of particular lattice sites, yielding phase shifts which result in image reconstruction in one- as well as two-dimensional configurations. Here, we demonstrate the first experimental realization of this concept. For the fabrication of the segmented waveguide arrays we used the femtosecond laser direct-writing technique. The total length of the arrays is 50mm with a waveguide spacing of 16 μm and 20μm in the one- and two-dimensional case, respectively. The length of the segmented area was 2.6mm, while the segmentation period was chosen to be 16 μm. This results in a complete inversion of the global phase of the travelling field inside the array, so that the evolution dynamics are reversed and the input field is imaged onto the sample output facet. Accordingly, segmented integrated optical devices provide a new and attractive opportunity for image transmission in finite systems.
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Matthias Heinrich, Alexander Szameit, Felix Dreisow, Thomas Pertsch, Stefan Nolte, Andreas Tünnermann, Eric Suran, Frédéric Louradour, Alain Bathélémy, Stefano Longhi, "Self imaging in segmented waveguide arrays", Proc. SPIE 7203, Commercial and Biomedical Applications of Ultrafast Lasers IX, 72030K (24 February 2009); doi: 10.1117/12.814491; https://doi.org/10.1117/12.814491
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