Infrared nanophotonics with carbon nanotube metamaterials
Abstract/Contents
- Abstract
- Assembly of nanomaterials into highly-ordered macroscopic structures holds potential for new optical materials and devices. This thesis introduces self-assembled films of carbon nanotubes as optical metamaterials and demonstrates their use in infrared nanophotonic resonators and electrically-driven thermal emitters. In the first part of this work, we study the effective optical constants of large-area films of globally-aligned and densely-packed single-walled carbon nanotubes prepared using a vacuum filtration process. The effective optical constants indicate that across a broad range of wavelengths in the mid-infrared these films have hyperbolic dispersion. The hyperbolic wavelength range can be tuned through reversible doping of the nanotubes. We show that ribbon structures patterned from the nanotube films function as hyperbolic resonators capable of localizing light at deeply subwavelength scales. A model for hyperbolic waveguide modes in the nanotube film explains the ribbon resonance and agrees with the results of a far-field spectroscopic study of many resonator arrays. In the second part of this work, we observe multiple resonances at different frequencies in large ribbon resonators and confirm that they are higher-order hyperbolic resonances. Combining the coexistence of multiple resonances with the doping tunability of the nanotube film, we demonstrate broadband high extinction with reversible switching in the mid-wave infrared. In the third part of this work we create electrically-driven thermal emitters in which arrays of nanotube metamaterial ribbons function as both resistive heaters and hyperbolic resonators. When the devices are electrically biased we observe quasi-coherent thermal radiation at the hyperbolic resonance frequency. Devices patterned on one chip from the same nanotube film emit at different wavelengths depending on the geometric parameters of the ribbon pattern, and the thermal radiation can be modulated up to 1 MHz because of the short thermal time constant of the heated resonator. This work establishes aligned carbon nanotubes as a tunable hyperbolic metamaterial in the mid-infrared with potential for use in actively tuned resonators and electrically-driven thermal emitters.
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 | 2021; ©2021 |
| Publication date | 2021; 2021 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Roberts, John Andris |
|---|---|
| Degree supervisor | Fan, Jonathan Albert |
| Degree supervisor | Hwang, Harold Yoonsung, 1970- |
| Thesis advisor | Fan, Jonathan Albert |
| Thesis advisor | Hwang, Harold Yoonsung, 1970- |
| Thesis advisor | Jornada, Felipe |
| Degree committee member | Jornada, Felipe |
| Associated with | Stanford University, Department of Applied Physics |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | John Andris Roberts. |
|---|---|
| Note | Submitted to the Department of Applied Physics. |
| Thesis | Thesis Ph.D. Stanford University 2021. |
| Location | https://purl.stanford.edu/pt226mk1957 |
Access conditions
- Copyright
- © 2021 by John Andris Roberts
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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