Nanophotonics for polarization control and thermal management
Abstract/Contents
- Abstract
- Polarization is one of the most fundamental degree of freedoms of photons. Techniques to control polarization are therefore of crucial importance from a fundamental perspective and find applications in many areas such as optical communications, sensing, and imaging. An important task in the control of polarization is to achieve polarization conversion, where one seeks to generate a target output polarization for a given input polarization. In the first part of this dissertation, we show that a photonic crystal slab with a mirror underneath can provide complete conversion between linear polarizations in a reflection process. Moreover, such an effect is topological since the complex reflection coefficients have a nonzero winding number in the wavevector space. We next show that such a structure can also achieve arbitrary polarization conversion. For a given incident light with any fixed polarization, one can generate arbitrary polarization in the reflected light, by varying the direction of the incident light. Photons are also important heat carriers. The ability to control thermal radiation and radiative heat transfer is of fundamental importance for a wide range of energy applications. In the second part of this dissertation, we use nanophotonic structures and principles to control thermal radiation and heat flow, which can provide thermal capabilities that are unavailable from conventional structures. In the first exmaple, we demonstrate narrowband thermal radiation with unity emissivity peak in the near-infrared range by critically coupling a flat tungsten surface with guided resonances of a dielectric photonic crystal slab. The frequency and linewidth of the emissivity peak are highly tunable. In the second example, we propose a scheme for achieving thermal switch in near-field radiative heat transfer. We present a practical implementation consisting of three nanospheres that are aligned in a straight line. Exploiting the thermal dependent resonances of the nanospheres, we show that the heat transfer between the two side spheres can be turned `on' and `off' by varing the temperature of the center sphere.
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 | 2019; ©2019 |
| Publication date | 2019; 2019 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Guo, Yu |
|---|---|
| Degree supervisor | Fan, Shanhui, 1972- |
| Thesis advisor | Fan, Shanhui, 1972- |
| Thesis advisor | Brongersma, Mark L |
| Thesis advisor | Miller, D. A. B |
| Degree committee member | Brongersma, Mark L |
| Degree committee member | Miller, D. A. B |
| Associated with | Stanford University, Department of Electrical Engineering. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Yu Guo. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2019. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2019 by Yu Guo
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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