"PhD Defense: Fabrication and Near-Field Characterization of Mid-Infrared Transmission Lines"

Who: Paulo Sarriugarte, Nanooptics Group

Place: CFM Auditorium

Date: Tuesday, 11 July 2017, 11:00

During this thesis, we fabricated infrared (IR) antennas and transmission lines (TLs), and characterized them by transmission-mode scattering-type scanning near-field optical microscopy (transmission-mode s-SNOM). By means of dipolar antennas we coupled mid-IR light into two-wire TLs and we investigated propagation properties such as local field enhancement, field confinement, mode (effective) wavelength, propagation length. In addition, we studied for the first time more complicated antenna structure such as Archimedean spiral antennas, which is a well-know travelling wave broadband antenna for radio-wave technology. To that end, we modified the transmission-mode s-SNOM setup available at nanoGUNE to be able to illuminate the samples with circularly polarized light. In order to support the experimental obtained near-field distributions, we have performed FDTD and FDFD simulations, which are in excellent agreement with the experimental data.

Supervisor: Rainer Hillenbrand

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