Antenna-coupled nonlinear signal generation in TMDCs
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Date
2020
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Doctoral Thesis
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Abstract
Nonlinear optics represents a discipline renowned for its importance in telecommunication and notorious for its weak interactions. Therefore, the demand for materials supporting high nonlinearities is ever increasing. A new nonlinear material class that recently sparked the intrigue of the academic world are so called transition metal dichalcogenides, in short TMDCs. However, their main disadvantage is the low interaction volume, as these materials are only efficient in their few atomic layer form. We aim to increase the interaction of light with these materials via the use of optical antennas – nano-sized antennas for light localization. In this work we present two different systems of optical antennas coupled to TMDCs. Their interactions allow us to enhance nonlinear emission and to spatially shape the radiation due to the redirecting properties of the antenna. Our experimental realizations come in the form of phased array antennas, beam steering devices known primarily in the radio-frequency regime. We demonstrate the possibility to steer the nonlinear emission of a TMDC monolayer via a metal antenna array. The second presented system is an antenna array consisting only of the TMDC material itself. We discuss the advantages and disadvantages of the two systems and, in the end, comment on the feasibility of either system in the context of nonlinear efficiency and validity for future usage in a phased array.
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Examiner: Novotny, Lukas
Examiner : Oulton, Rupert
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ETH Zurich
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03944 - Novotny, Lukas / Novotny, Lukas
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165841 - Nonlinear optics with hybrid plasmonic-TMDC materials (SNF)