Flat optics based on dielectric gradient metasurfaces
Abstract/Contents
- Abstract
- Metasurfaces provide unprecedented control over light propagation by imparting local, space-variant phase changes on incident electromagnetic waves. They have contributed to the replacement of bulky optical components with ultrathin planar elements. They can also improve the performance of conventional optical elements and facilitate the creation of optical components with new functionalities. We first describe the operating principles and the experimental demonstration of dielectric gradient metasurface optical elements (DGMOEs) that capitalize on the development of high-index dielectric optical antenna and Pancharatnam-Berry phase optical elements. In particular, we illustrate how ultrathin gratings, lenses, and axicons, operating in transmission mode in the visible spectrum, can be realized by patterning a 100-nm-thin Si layer into a dense arrangement of judiciously arranged nanostructures. Additionally, we build on the knowledge obtained from the development of shared-aperture phased array antennas and Si-based gradient metasurfaces to fabricate various multifunctional metasurfaces capable of achieving multiple distinct functions within a single surface. In particular, we demonstrate that interleaving of multiple optical elements can be accomplished without reducing the aperture of each sub-element. Multifunctional optical elements constructed from a Si-based gradient metasurface are realized, including polarization-independent metasurfaces and axial and color separating metasurface lenses. We also demonstrate multi-wavelength color imaging with high spatial resolution using an axial multifunctional metasurface. Finally, an optical imaging functionality with simultaneous color separation is obtained using a color separating metasurface. Lastly, we develop a multiplexed metasurface lens array based on multi-functional dielectric gradient metasurfaces to replace the conventional microlens array in light-field imaging applications. The multiplexed metasurface lens arrays allow simultaneous 3D imaging at a high spatial resolution, which overcomes the trade-off between spatial and angular resolutions when using a conventional microlens array constructed from a series of lenslets with a small aperture size. These Si-based gradient metasurfaces offer facile integration with electronics and can be manufactured using mature semiconductor fabrication techniques. They open up a myriad of opportunities in the fields of optical communications, advanced computational imaging and display systems.
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 | Lin, Dianmin |
|---|---|
| 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 | Dianmin Lin. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2016. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2016 by Dianmin Lin
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