טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentChachamovitz Yoav
SubjectHybrid Plasmonic-Dielectric Nanoantennas
DepartmentDepartment of Electrical Engineering
Supervisor Professor Guy Bartal
Full Thesis textFull thesis text - English Version


Abstract

The increasing interest in manipulating light on scales much smaller than its wavelength has driven an intensive research on designing high efficiency optical antennas for near and far field applications. In particular, such nanoantennas serve as the main building block of metasurfaces, which were identified as an emerging technology for their capability in constructing versatile optical and electro-magnetic devices. Hence, reducing the antennas dimensions without compromising on their scattering efficiency is of outmost importance. In this thesis, we show that nanoantennas carved from hybrid plasmonic-dielectric waveguides preserve the unique properties of the hybrid modes, showing stronger confinement and better tunability at a relatively low  loss, emanating from the coupling between the dielectric and plasmonic modes. This enables a design of high performance ultrasmall antennas that outperform dielectric and plasmonic nanoantennas at similar dimensions. We demonstrate this capability by simulating the performance of metasurface made of ultrasmall hybrid nanoantennas, proven to be superior over its dielectric and plasmonic counterparts. Using such hybrid nanoantennas as unit cells in metasurfaces holds a great promise for designing  new tunable, multifunctional and low-loss nano-optical materials and  applications.