Vanadium Dioxide (VO2) has been garnering a lot of attention because of its ability to undergo a phase transition from insulator to metal when heated and to switch back to insulator when cooled. Here we use the scattering-type Near-Field Optical Microscope to study the changes caused in the optical properties by the phase transition in near-field regime of VO2. We observe the growth of metallic VO2 puddles at varying temperatures from room temperature up to a critical temperature around 358 K.
The insulator to metal transition causes the optical constants in VO2 to drastically change. Taking advantage of the change, coupling VO2 with plasmonic structures has the interesting effect of combining to form optical metamaterials. These man-made materials exhibit behaviors not found in nature. Using the Lumerical Solutions software, it is possible to model and simulate those optical behaviors for different types of noble metal plasmonic structures using insulating and metallic VO2 at different light sources. These metamaterials can be categorized as hybrid-tunable metamaterials which can be designed to filter certain resonance frequencies without having to change plasmonic structure.
|Commitee:||Kwon, Chuhee, Peterson, Michael|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 54/05M(E), Masters Abstracts International|
|Subjects:||Condensed matter physics|
|Keywords:||Thin films, Vanadium dioxide|
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