14 May 2018 Graphene all-optical sensor based on nonlinear multimode interference coupler
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In this paper, we proposed a multipurpose graphene all-optical sensor based on the nonlinear effect in a multimode interference (MMI) coupler. The use of a graphene as a core for this device is because of its high optical nonlinearity value and thin layer which makes its bandgap relatively small. Graphene also has a lot of great characteristics to be used as sensor material such as high thermal and electric conductivity, light yet durable and also almost transparent due to its being a single layer atom. The graphene will be sandwiched with a substrate that have a varying value of refractive index. By changing the refractive value of the substrate, an external wave will interact with the input waveguide thus lead to a change in the intensity of the output waveguide which will be analysis for the sensor output. The result shows the high distinguished changes on modal expansion and output distribution in various refractive indices of surrounding layer.
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M. A. A. Hassim, M. A. A. Hassim, W. Maryam, W. Maryam, M. Z. Mat Jafri, M. Z. Mat Jafri, } "Graphene all-optical sensor based on nonlinear multimode interference coupler ", Proc. SPIE 10684, Nonlinear Optics and its Applications 2018, 1068425 (14 May 2018); doi: 10.1117/12.2307341; https://doi.org/10.1117/12.2307341

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