Manipulation of sub-micron particles across a patterned plasmonic substrate
Abstract/Contents
- Abstract
- Over the past 30 years, light has played an expanding role in the manipulation and processing of materials. Focused beams of light have been used to impart and measure forces on the order of piconewtons, leading to major breakthroughs in the understanding of important biological molecules such as DNA and motor proteins, and novel systems which use light to trap and sort biological materials on a chip have been developed. However, these systems rely on the principles of far-field optics to project optical energy into space, and are thus limited in resolution to approximately 500 nm by the laws of diffraction. Furthermore, the bulky and expensive lens systems that are required to produce tightly focused beams of light limit the deployment of such systems to a laboratory setting. To overcome these limitations, alternative optical trapping techniques have recently been developed which utilize the optical near-field of plasmonic resonators. While these methods can, in principle, improve the resolution of optical traps beyond the limits set by diffraction and overcome the scalability issues associated with far-field optics, they have been hamstrung by their inherently short range of less than 1 μm and are unsuitable for particle transport. The following work presents a novel technique to extend the transport capability of plasmonic resonators by inducing the handoff of a particle from one plasmonic trap to the next. This method uses lithography patterning rather than beam forming to determine transport behavior. We will cover the fundamental basis for this technique and present the first-ever demonstration of the transport of a 390 nm diameter particle along a plasmonic conveyor belt 4.5 μm in length using only a low-NA objective lens (NA < 0.75) and a modest peak beam intensity of 3 mW/μm². While the initial experiment transports a single particle over only a short path, the technique may be scaled to a conveyor of potentially any shape and length and support the simultaneous transport of multiple particles. Critical in the design of such a system is a fast and flexible tool for the calculation of optical forces; we present one such technique and demonstrate a 1000x speedup over traditional methods. We also present a theory for the full generalization of the plasmonic conveyor technique to two dimensions and present a complete class of examples that could be used for the parallel transport and routing of particles across the surface of a chip. We close with a discussion of future work and implications for future lab-on-a-chip technologies.
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 | Ryan, Jason |
|---|---|
| Associated with | Stanford University, Department of Electrical Engineering. |
| Primary advisor | Hesselink, Lambertus |
| Thesis advisor | Hesselink, Lambertus |
| Thesis advisor | Brongersma, Mark L |
| Thesis advisor | Pease, R. (R. Fabian W.) |
| Advisor | Brongersma, Mark L |
| Advisor | Pease, R. (R. Fabian W.) |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Jason Ryan. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2016. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2016 by Jason David Ryan
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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