Using Nonlinear Effects of Light for Optical Signal Processing

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Shatery, Farshid | 2018

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 52479 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Kavehvash, Zahra
Abstract:
Ultrafast signal processing in time-domain with high resolution and reconfigura-bility is a challenging task. This paper, for the first time, introduces a time-varying metasurface consisting of graphene microribbon array for implementing time-lens in the terahertz domain. Given that the surface conductivity of graphene is proportional to the Fermi energy level in the THz regime, it is possible to change the phase property of the incident electromagnetic pulse by changing the Fermi level while the Fermi level itself is a function of voltage. Upon this fact, a quadratic temporal phase modulator, namely time-lens has been realized. This phase modulation is applied to the impinging signal in the time domain. The terahertz time-lens is a key element for processing of ultrafast temporal pulses. Using this time-lens a temporal filter in te-rahertz regime is implemented that has immense applications in the terahertz com-munication and spectroscopy
Keywords:
Graphene ; Time-Frequency Analysis ; Signal Processing ; Plasmonic Metasurfaces ; Time Lens

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