Active nanophotonics : inverse design and strained germanium light emitters
Abstract/Contents
- Abstract
- Integration of optical devices into modern CMOS electronics processes offers a wide range of opportunities and challenges for optical design. Modern foundry processes provide an enormous amount of design freedom in feature shapes and sizes; such freedom is rarely fully exploited by traditional human-directed design methods. At the same time, fabrication considerations greatly limit the material selection available for on-chip optics, making integration of most existing light sources infeasible. The first part of this dissertation focuses on the use of strained germanium (Ge) as a Si-compatible light source. While Ge is naturally an indirect bandgap material and thus poorly suited to light emission, application of tensile strain can be used to modify the bandstructure of Ge, greatly increasing light emission efficiency. To this end, we present design and experimental analysis of an optical device which integrates 2.4% uniaxial tensile strain, a single-material pseudo-heterostructure, and a Q > 2,000 cavity in a Ge-on-insulator material system. The second part of this dissertation presents a method for computational inverse design of active optical devices. Rather than relying on a small number of human-chosen design parameters to determine the structure of the device, inverse design begins with an arbitrary structure and then adjusts all available degrees of freedom to create a working device. To illustrate the effectiveness of this method, we present inverse-design of an all-optical switch, resulting in a device that uses 22x less power, 2.5x less power density, and 8x less device area than similar devices reported in recent literature.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2016 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Petykiewicz, Jan |
|---|---|
| Associated with | Stanford University, Department of Electrical Engineering. |
| Primary advisor | Vuckovic, Jelena |
| Thesis advisor | Vuckovic, Jelena |
| Thesis advisor | Miller, D. A. B |
| Thesis advisor | Saraswat, Krishna |
| Advisor | Miller, D. A. B |
| Advisor | Saraswat, Krishna |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Jan Petykiewicz. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2016. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2016 by Jan Aksel Petykiewicz
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