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Ferroelectric Superlattices for Use in Non-linear Transmission Lines. Robert James Sleezer Research Proposal Defense 16 December 2008. Acknowledgements. Gregg Salamo , Advisor Jerzy Krasinski , Masters Advisor and Committee Member Laurent Bellaiche , Committee Member
Gregg Salamo, Advisor
JerzyKrasinski, Masters Advisor and Committee Member
Laurent Bellaiche, Committee Member
Jacques Chakhalian, Committee Member
Ken Vickers, Committee Member
Morgan Ware, Mentor
National Science Foundation G-K12 Progam
MRI #0421099 (Red Diamond) and MRI #072265 (Star of Arkansas) from the National Science Foundation
Shock wave generation
Creation of harmonics
Layer A: Ba0.5-xSrx+0.5TiO3
Layer B: Bax+0.5Sr0.5-xTiO3
: of or relating to crystalline substances having spontaneous electric polarization reversible by an electric field
Definition According to Mirriam-Webster
Non-linear Relationship Between Polarization and Electric Field
Strain Imposed by Lattice Mismatch With Substrate or Neighboring Layers
Changes in Tc and In Turn Phase
Strain May Effect Tc in a Thin Film Ferroelectric
Satellites in the diffraction pattern of PTO are an indication of ferroelectric stripe domains. The sample with four unit cells remains ferroelectric through at least 644K, the three unit cell sample looses it’s ferroelectricity between 463K and 549K, and the thinner samples remain paraelectric at all temperatures.
An Atom in an Ultrathin Film Does Not Experience the Same Environment as an Atom in Bulk Material
Slightly Thicker Films Also Show Material Property Variation
Layered Thin Film Materials Can Create Local Environments Unlike Bulk Environments
Thicker Films Can Create Strain Throughout the Sample
tr = 80ns
tr = 40ns
Transmission Line Constructed From Discrete Inductors and Varactors
Shock Wave With Ringing Related to Unit Cell Resonant Frequency is Developed
Lines 2m Were Fabricated and Tested
Probes Were Placed at Different Locations Along the Line
Output Was Studied as a Function of Input
Unfiltered Simulation Results Show Significant Ringing at Unit Cell Resonant Frequency
Application of a Band Reject Filter Removes Unwanted Ringing
Smaller Unit Cells Have Higher Frequency Ringing
Adjustments to Rc to Account For Frequency Dependant Loss Tangent
Freestanding Thin Films
Cold-welded Thin Films
Non-linear Transmission Line
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