Graphene-based electro-optical modulators integrated into polymer waveguide with three dielectric materials proposals

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Data de publicação
2018 SBFoton International Optics and Photonics Conference, SBFoton IOPC 2018
Citações (Scopus)
Camacho W.A.
Thoroh De Souza E.A.
Saito L.A.M.
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© 2018 IEEE. This work presents an analysis of electro-optical modulators integrated into polymer waveguides, which operates over electro-Absorption effect through graphene. This study focus in three different dielectric materials for the capacitive structure in the device such as silicon nitride, Si 3 N 4 , hafnium oxide, HfO 2 and boron nitride, hBN. By varying the thickness of the dielectric material, it was possible to improve the extinction ratio, modulation frequency and reduce the switching voltages requirements. By considering a bottom cladding, it was possible to increase the light interaction with the graphene and obtain higher modulation frequencies. In the case of the device with HfO 2 , it was possible to obtain the highest extinction rate of 0.117 dB/μm with a dielectric thickness of 50 nm. For the model with the hBN thickness layer of 50 nm, the maximum operation frequency was 35 GHz, considering a device length of 27 μm. The condition with the minimum voltage requirements was obtained with HfO 2 , which the value switching was between 2.5 and 5 V. Although the results with Si 3 N 4 are not the best, it is a good option when the device project try to match all the design requirements.
Assuntos Scopus
Capacitive structure , Dielectric thickness , Electro-absorption effects , Electrooptical modulators , Modulation frequencies , Operation frequency , Polymer waveguides , Voltage requirement