Device application of metafilms and metasurfaces
Abstract/Contents
- Abstract
- The phase reversal that occurs when light reflects from a metallic mirror produces a standing wave profile that features a reduced light intensity and thus light-matter interaction near its surface. This is highly undesirable in optoelectronic devices that employ metal films as electrical contacts and optical mirrors; it dictates a minimum spacing between the metal and active semi-conductor layers in a device and poses a fundamental limit to their practical thickness. In this thesis, we illustrate how a metamaterial-mirror can be created in the visible spectral range whose reflection phase is tunable from that of a perfect electric mirror to a perfect magnetic mirror . We then demonstrate the benefits of implementing such a mirror in two real device. Specifically, we show how light absorption and photocurrent generation in a sub-100-nm active semiconductor layer can substantially be enhanced over a broad spectral band. Based on the reciprocity principle for light waves, metamaterial mirrors are expected to also enable more effective light extraction from thin light emitting devices. High-performance light-emitting diodes (LEDs) rely on high sheet- conductivity metallic contacts to facilitate effective charge injection. Unfortunately, such contacts also support surface plasmon polariton (SPP) excitations that guide and ultimately dissipate optical energy in the metal. The coupling of quantum emitters to SPPs constitutes one of the key loss processes that limit the external quantum efficiencies of LEDs. In this thesis, we also illustrate how high-impedance metamaterial-electrodes can be created that do not support propagating SPPs on their surfaces. These superior electrodes greatly suppress dissipative losses while providing a desirable Lambertian emission profile. Our claims are verified by studying the emission enhancement and photoluminescence lifetime changes for a 15 nm thick Rhodamine 6G dye emitter placed on metamaterial electrodes.
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 | Esfandyarpour, Majid |
|---|---|
| Associated with | Stanford University, Department of Electrical Engineering. |
| Primary advisor | Brongersma, Mark L |
| Thesis advisor | Brongersma, Mark L |
| Thesis advisor | Fan, Shanhui, 1972- |
| Thesis advisor | Miller, D. A. B |
| Advisor | Fan, Shanhui, 1972- |
| Advisor | Miller, D. A. B |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Majid Esfandyarpour. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2016. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2016 by Majid Esfandyarpour
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