Reconfigurable Metamaterial Comprised of Dielectric Resonators and Plasma
Fantini, Lisa.
2019
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Metamaterials have
applications in fields spanning biology to electrical engineering. Advancing
metamaterial technology can improve their performance in current applications and also
lead to more applications. I continued to investigate a metamaterial made out of
dielectric resonators and plasma by scaling it down, making it into a 2-D structure, and
comparing it to theory. I used Raizer ... read moretheory, simulations on ANSYS HFSS, and
experimental results to determine the best conditions for plasma formation. Dielectric
resonators (calcium titanate cylinders with ~5.7 mm diameters and ~1.9 mm heights)
separated by 0.25 mm and with their flat sides facing each other, formed plasma in their
HEM111 resonance mode, at ~4 Torr and in the range of 6-7 GHz. Turning the plasma on and
off changed the transmission properties of the metamaterial, leading to tunability.
Dielectric resonators can have a negative permeability, and plasma can have a negative
permittivity, therefore this metamaterial could potentially have a negative index of
refraction (NIR), which could lead to novel applications such as "perfect"
lenses.
Thesis (M.S.)--Tufts University, 2019.
Submitted to the Dept. of Electrical Engineering.
Advisor: Jeffrey Hopwood.
Committee: Timothy Atherton, and Thomas Vandervelde.
Keywords: Electrical engineering, Materials Science, and Physics.read less - ID:
- 70795n37n
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