Electrically tunable metamaterials with high-aspect-ratio nanostructures
Abstract/Contents
- Abstract
- Metamaterials are engineered optical media composed of subwavelength structures. With different physical arrangements and dimensions of such elements as well as a wide range of possible constituent materials, metamaterials can possess novel optical properties and enable many interesting applications. Dynamic control of light is also possible in semiconductor-based metamaterials by tuning the carrier density with field-effect modulation. However, most papers in the literature on electrically tunable infrared metamaterials use essentially flat designs or so-called "metasurfaces" with ultrathin semiconductor layers and resonant metal antennas, which suffer from exceptionally small interaction lengths with light. This thesis will demonstrate two projects that follow an alternative approach with three-dimensional, high-aspect-ratio nanostructures to increase the optical interaction length within a thicker metamaterial, thus allowing for large modulation of the amplitude and phase of light by varying the applied voltage. For both sets of devices, the fabrication process with electron-beam lithography, experimental measurements of reflectance modulation, and simulation results from effective medium models will be discussed. One potential future application of this work could be a completely solid-state beam steering solution with a phased array of electrically tunable metamaterials to replace the bulky mechanical lidar scanning systems in self-driving cars.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2019; ©2019 |
| Publication date | 2019; 2019 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Morea, Matthew |
|---|---|
| Degree supervisor | Harris, J. S. (James Stewart), 1942- |
| Thesis advisor | Harris, J. S. (James Stewart), 1942- |
| Thesis advisor | Brongersma, Mark L |
| Thesis advisor | Kamins, Theodore I |
| Degree committee member | Brongersma, Mark L |
| Degree committee member | Kamins, Theodore I |
| Associated with | Stanford University, Department of Electrical Engineering. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Matthew Morea. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2019. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2019 by Matthew Morea
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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