Seminar EE - ZOOM = Tuning the Phase and Amplitude Response of Plasmonic Metasurface Etalons
סמינר זה יחשב כסמינר שמיעה לתלמידי תואר שני, למי שמתחבר לסמינר דרך הזום.
You are invited to attend a lecture on Wednesday, Apr 22, 2020 14:00
Join Zoom Meeting
Tuning the Phase and Amplitude Response of Plasmonic Metasurface Etalons
By:
Danielle Ben Haim
M.Sc. student under the supervision of Prof. Tal Ellenbogen
Abstract
The research in the field of metasurfaces over the past years has shown their ability to control and manipulate light and thus form unique and novel electro-optical elements. These surfaces consist of arrays of subwavelength particles that exhibit a collective response which is governed by the particles properties, such as their material, shape and size. Understanding the physical behaviour of the particles in the subwavelength regime is what enables to control the overall effective properties of the element.
In this work we study the optical response of plasmonic metasurface etalons in reflection. The etalons consist of a metallic mirror and a plasmonic metasurface separated by wavelength-scale dielectric spacer. We explore the underlying physical mechanisms involved in their electromagnetic response and show that tuning the localized surface plasmon resonance and spacer thickness can be used to achieve both enhanced reflectivity and perfect absorption, in addition to full range phase control, and tunable regions of normal and anomalous dispersion. We characterize the spectral reflection and phase response of metasurface etalons consisting aluminum nanodisks of different radii separated from an aluminum reflector by a SiO2 spacer. We use this approach to demonstrate a simple Hermite-Gaussian (HG) wavelength selective beam-shaping reflective mask and discuss the potential of this concept to be further extended by using multilayers to obtain multi-functional elements.
