Graphene-based Plasmonic Phase Modulator for terahertz-band communication
Singh, Prateek Kumar
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The capacity limitations and spectrum scarcity problems of current wireless networks motivate the utilization of unprecedented frequency bands for communication. In this direction, Terahertz Band (0.1-10 THz) communication is envisioned as a key wireless technology to satisfy the demand for higher speed wireless links. Current silicon-based transceiver components or even transceivers based on III-V semiconductors are unable to sustain the high speed requirement of THz Band communications. There are still many research challenges in the realization of THz Band communication networks, especially regarding efficient and ultra small modulator/demodulator design tailored to the peculiarities of THz Band communication. Innovative modulator/demodulator design, potentially based on novel materials, are needed to increase both the power and the frequency of operation of existing transceivers. One promising approach to implementing such devices utilizes Surface Plasmon Polariton(SPP) waves on graphene layer. The objective of this thesis is to establish the foundations of Plasmonic Phase Modulator for THz Band communication using SPP wave propagation on graphene layer. First, surface conductivity of graphene and wave vector properties of SPP wave at THz Band are reviewed from existing related work and their behaviour with frequency and fermi energy is established. Then, novel Plasmonic Phase Modulator based on graphene is proposed, modeled and analyzed and its phase behaviour with respect to fermi energy is established. In addition, a mathematical framework is developed to map its signal space constellation and its performance is derived in terms of symbol error rate(SER). COMSOL simulation is also employed to analyse electric field distribution with respect to fermi energy on graphene surface. Finally, possible future novel device design like Plasmonic ADC/DAC system are proposed and their working principle are described.