Designing an electro-optical encoder based on photonic crystals using the graphene–Al2O3 stacks
| Autor: | Mohammad Soroosh, Navid Alaei-Sheini, Fatemeh Haddadan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Rotary encoder
Materials science Silicon business.industry Graphene chemistry.chemical_element Optical power 01 natural sciences Signal Atomic and Molecular Physics and Optics law.invention 010309 optics Optics chemistry Stack (abstract data type) law 0103 physical sciences Electrical and Electronic Engineering business Engineering (miscellaneous) Encoder Photonic crystal |
| Zdroj: | Applied Optics. 59:2179 |
| ISSN: | 2155-3165 1559-128X |
| Popis: | In this paper, an electro-optical 4-to-2 encoder based on a photonic crystal is presented. The structure is composed of four silicon waveguides, four photonic crystal structures including the graphene– A l 2 O 3 stacks, and two optical combiners. Two one-dimensional arrays of air holes in the silicon background are designed parallel to the waveguides. Also, a graphene– A l 2 O 3 stack is placed at the center of each array, which provides the desired interferences. This feature is used for controlling the optical wave transmission through the waveguides. Using two optical combiners at the end of two waveguides, the received signals from the waveguides will be guided toward the output ports. The amount of the transmitted signal from input ports to the output of the encoder can be controlled by applying the proper chemical potential to the graphene-based stacks. The simulation results show that the encoding operation can be achieved by using 0.2 eV and 0.8 eV for chemical potentials. In addition, the normalized output power margins for logic 0 and 1 are calculated to be 8.2% and 46.7%, respectively. The footprint for the proposed structure is approximately equal to 127 µ m 2 . Also, the required optical power intensity at input ports is 100 m W / µ m 2 . |
| Databáze: | OpenAIRE |
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