Nanoscale transverse Fabry-Perot resonators
Abstract/Contents
- Abstract
- The ability to fabricate multiple resonant photodetectors, each with separately engineered wavelength sensitivity, in a single-step process has many potential applications. In this dissertation, we propose and demonstrate the use of nanoscale semiconductor fin structures surrounded by metal as efficient transverse Fabry-Perot resonators which allow one to efficiently excite in-plane resonances under surface-normal incidence. We show that these devices support strong absorption resonances that can be tuned by varying the width of the structure and use this effect to engineer devices for two potential application areas. In the first part of the dissertation, we show how we can engineer nanoscale planar multispectral image sensors based on silicon fins surrounded by metallic slits wherein the resonant wavelength of each pixel is determined by the width of the silicon fin. The same metallic structure is used for both light confinement and carrier extraction in a compact metal-semiconductor-metal (MSM) geometry. We experimentally study how close we can put two of these pixels together and how small we can make an individual pixel. We show that, in principle if the electrical properties of the devices are suitably controlled, one can engineer devices with pixel pitch down to 250 nm and pixel sizes down to 500 nm by 500 nm. In the second part of the dissertation, we use this effect to enhance the indirect absorption in germanium and engineer CMOS-compatible germanium photodetectors with high responsivity across the telecommunications bands (both C and L bands). Finally, we show that this effect can be used to engineer passive devices like novel resonant waveguide couplers that can be used to couple light efficiently from free space to both dielectric and plasmonic slot waveguides with slot widths ~ 50 nm.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2013 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Coimbatore Balram, Krishna |
|---|---|
| Associated with | Stanford University, Department of Electrical Engineering. |
| Primary advisor | Miller, D. A. B |
| Thesis advisor | Miller, D. A. B |
| Thesis advisor | Brongersma, Mark L |
| Thesis advisor | Fan, Shanhui, 1972- |
| Advisor | Brongersma, Mark L |
| Advisor | Fan, Shanhui, 1972- |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Krishna Coimbatore Balram. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2013. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2013 by Krishna Coimbatore Balram
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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