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Volume 26 - ICOP & ICPET 2020
ICOP & ICPET _ INPC _ ICOFS 2020, 26 - ICOP & ICPET 2020: 673-676 |
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Sanati A, Jafari B, Soofi H. Multiband Electro Optic modulator Based on Graphene in the Mid-IR wavelength range. ICOP & ICPET _ INPC _ ICOFS 2020; 26 :673-676
URL: http://opsi.ir/article-1-2152-en.html
URL: http://opsi.ir/article-1-2152-en.html
1- Faculty of Electrical and Computer Engineering, University of Tabriz
Abstract: (1395 Views)
In this article a multiband optical modulator based on single layer graphene in the mid-IR wavelength range is designed and simulated. In this modulator metallic nano antennas are utilized to enhance absorption and modulator characteristics. Most of the graphene based electro-optic modulators function according to the modification of absorption with electrostatic doping through gate electrode. Such modulators often require high voltage and have low responsivity for lower voltages due to the low absorption of single layer graphene. In this article, an electro-optic modulator based on graphene is designed at which the modulation principle is Fabry-Perot interference between counter propagating graphene plasmon waves in a metal-dielectric-graphene-metal structure and reaches a modulation depth of nearly 100% with a very small applied voltage. For wavelengths of 6 and 7.5um, modulation depth of 70 and 85 % are obtained. For these wavelengths insertion loss is 0.8 and 2.21 dB respectively. In this modulator, graphene is employed for absorption, but instead to shift the resonance wavelength of the Fabry-Perot structure. In this article, the reflected wave is considered as the modulated signal.
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