FROM THE NEAR FIELD OF NANO- ANTENNAS TO THE FAR FIELD OF METASURFACES Thesis Supervisor: Dr. Yannick De Wilde Co-supervisor: Dr. Patrick Bouchon

Education 2013 – 2016 Bachelor of Science: Lebanese University (UL) – Faculty of Sciences General Physics  Numerous courses covering areas of fundamental physics and mathematics  Lab courses in optics and electronics 2016 – 2019 Masters of Science - Graduate Assistant: American University of Beirut Physics  Advanced courses in physics and mathematics  Thesis in thermal transport in nanostructures (Thesis advisor: Dr. Michel Kazan) 2

Research Experience Master’s thesis title: Model for Lattice Thermal Conductivity of Free and Clamped Surface Cylindrical Nanowires (NWs) - Thesis advisor: Dr. Michel Kazan 2018 – present Research Assistant, American University of Beirut – Dr. Michel Kazan  Research in thermal transport due to surface-phonon polaritons (SPP)  Calculation of thermal conductivity due to SPP in cylindrical nanowires and nanotubes (in progress)  Measurements of thermal diffusivity due to SPP modes in amorphous SiO 2 and SiC ultra-thin films using pulsed Infra-red (IR) laser techniques 3

Master’s thesis research Objective of the research: Development of an analytical model for the prediction of thermal conductivity of NWs, and investigation of the effect of different surface conditions on the thermal conductivity - Effect of surface roughness - Effect of clamped And free surface Boundary conditions Large difference in thermal conductivity may be used to modulate the thermal current Comparison with experimental measurements reported by Li et al. Applied Physics Letters (2003):

Research activities Ongoing project: Calculation of thermal conductivity due to Surface phonon-polariton (SPP) modes in cylindrical nanowires and nanotubes Measurement of thermal diffusivity due to SPP modes in ultra-thin films 5 Theoretical prediction

Research activities (cont.) Measurement of thermal diffusivity in thin films using Infra-red (IR) Laser flash experiment Energy balance equation provides a differential equation for transient temperature distribution Thermal diffusivity The knowledge of the heat diffusivity allows the determination of the transient temperature distribution in the material and the rate at which the material reaches a state of thermal equilibrium 6

Research activities (Cont.) Experimental setup: 7

Research activities (Cont.) Measurement of thermal diffusivity due to SPP in ultra-thin films Why infrared heating beam? Surface phonon polariton dispersion in bulk Surface phonon polariton dispersion in 10 nm thick film SPhP modes in ultra-thin films can interact with infrared light Thermal diffusivity in ultra-thin films can be measured with IR laser flash 8

PhD Thesis Thesis supervisor and co-supervisor : Dr. Yannick De Wilde, Dr. Patrick Bouchon Objectives of the study: Measurement of the thermal emission of a single sub-λ MIM nano-antenna Investigation of nano-antennas of different geometries, and their effect on polarization, directionality… How do they couple? e.g: rod-like nano-antennas 9

PhD thesis (cont.) Instrumental development: Addition of polarization analysis Back-focal imaging Investigation of thermal excitation by pulsed laser heating 10 Claire Li et al., Phys. Rev. Lett. 121, (2018).

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