Enhancing the light-matter interaction in graphene
Abstract/Contents
- Abstract
- Graphene, a two-dimensional sheet of hexagonally arranged carbon atoms, can absorb 2.3 % of the incident light over a broad range of wavelengths. Whereas the single-layer-absorption is impressive, it is not strong enough for many optoelectronic applications as virtually all the light is transmitted. Moreover, for active devices such as electro-optical modulators and actively controlled thermal emitters, dynamic control over absorption is required as well. We will discuss an electrically-tunable Salisbury screen device configuration that involves placing graphene about a quarter wavelength (λ/4) distance away from a metal back reflector. This design is capable of achieving both increased absorption and active absorption modulation in a single graphene sheet. However, there is an increasing desire to build ultra-compact devices such that the costs of these devices are minimized without compromising on their performance. To satisfy this additional requirement, we combine graphene with metamaterial mirrors that enhance the electric field and hence light-matter interaction within graphene at the mirror surface. We employ Raman spectroscopy to explore the interesting dependence of the electric fields within graphene on the underlying metamaterial mirror dimensions and project the graphene-coated metamaterial mirrors as uniform and tunable SERS (Surface Enhanced Raman Spectroscopy) substrate. As a final step, we perform reflectance measurements on these metamaterial mirrors and establish a direct correlation of these measurements with Raman measurements. We conclude, therefore, that it is possible to predict the strength of our SERS substrate using reflectance measurements solely.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2017 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Thareja, Vrinda |
|---|---|
| Associated with | Stanford University, Department of Materials Science and Engineering. |
| Primary advisor | Brongersma, Mark L |
| Thesis advisor | Brongersma, Mark L |
| Thesis advisor | Fan, Shanhui, 1972- |
| Thesis advisor | Harris, J. S. (James Stewart), 1942- |
| Advisor | Fan, Shanhui, 1972- |
| Advisor | Harris, J. S. (James Stewart), 1942- |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Vrinda Thareja. |
|---|---|
| Note | Submitted to the Department of Materials Science and Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2017. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2017 by Vrinda Thareja
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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