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Microsecond switching of plasmonic nanorods in an all-fiber optofluidic component
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
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2017 (English)In: Optica, ISSN 334-2536, Vol. 4, no 8, 864-870 p.Article in journal (Refereed) Published
Abstract [en]

As information technologies move from electron-to photon-based systems, the need to rapidly modulate light is of paramount importance. Here, we study the evolution of the electric-field-induced alignment of gold nanorods suspended in organic solvents. The experiments were performed using an all-fiber optofluidic device, which enables convenient interaction of light, electric fields, and the nanorod suspension. We demonstrate microsecond nanorod switching times, three orders of magnitude faster than a traditional Freederickcz-based liquid crystal alignment mechanism. We find that the dynamics of the alignment agrees well with the Einstein-Smoluchowski relationship, allowing for the determination of the rotational diffusion coefficient and polarizability anisotropy of the nanorods as well as the effective length of the ligands capping the nanorods. The ability to dynamically control the optical properties of these plasmonic suspensions coupled with the point-to-point delivery of light from the fiber component, as demonstrated in this work, may enable novel ultrafast optical switches, filters, displays, and spatial light modulators.

Place, publisher, year, edition, pages
Optical Society of America, 2017. Vol. 4, no 8, 864-870 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-214333DOI: 10.1364/OPTICA.4.000864ISI: 000407909800005Scopus ID: 2-s2.0-85028296486OAI: oai:DiVA.org:kth-214333DiVA: diva2:1140874
Note

QC 20170913

Available from: 2017-09-13 Created: 2017-09-13 Last updated: 2017-10-18Bibliographically approved
In thesis
1. Advanced all-fiber optofluidic devices
Open this publication in new window or tab >>Advanced all-fiber optofluidic devices
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Significant technological advances of the last years have been possible by developments in Optofluidics, which is a field that deals with the integration of optics and microfluidics into single devices.

The work described in this thesis is based on five scientific publications related to the use of fiber optic technology to build integrated optofluidic devices. The first three publications are within the field of life-science and point towards in-vivo and point-of-care applications, whereas the last two publications cover the study and the use of plasmonic nanoparticles for electrical modulation of light.

Aiming at developing useful tools for in-vivo biological applications, the first publication consists of designing and testing a functional optical fiber for real-time monitoring and selective collection of fluorescent microparticles. This probe relies on a microstructured optical fiber with a hole along its cladding, which is used to selectively aspirate individual particles of interest once their fluorescence signal is detected. On the same line of research, the second publication contemplates the fabrication of a fiber probe that traps single microparticles and allows for remote detection of their optical properties. This probe is also based on a microstructured fiber that enables particle trapping by fluidic forces. The third publication addresses the development of an all-fiber miniaturized flow cytometer for point-of-care applications. This system can analyze, with excellent accuracy and sensitivity, up to 2500 cells per second by measuring their fluorescence and scattering signal. A novel microfluidic technique, called Elasto-inertial microfluidics, is employed for aligning the cells into a single-stream to optimize detection and throughput.

The fourth publication involves the experimental and theoretical study of the electrical-induced alignment of plasmonic gold nanorods in suspension and its applicability to control light transmission. This study is done by using an all-fiber optofluidic device, based on a liquid-core fiber, which facilitates the interaction of light, electric fields, and liquid suspensions. Results show that nanorods can be aligned in microseconds, providing a much better performance than liquid-crystal devices. Finally, the fifth publication consists of an upgrade of the previous device by integrating four electrodes in the cladding of the liquid-core fiber. This improvement enables nanosecond response time and the possibility of digitally switching nanorods between two orthogonal aligned states, overcoming the limitation of slow thermal relaxation.

The work presented here shows that optofluidics based on optical fibers is a robust and convenient platform, as well as a promising direction for the developing of novel instruments in fields such as life-science, non-linear optics, plasmonic, and sensing.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017. 68 p.
Series
TRITA-FYS, ISSN 0280-316X ; 2017:65
Keyword
Fiber optics, functional fiber probes, optofluidics, microfluidics, plasmonic, all-fiber technology, instrumentation for life-sciences.
National Category
Medical Engineering Physical Sciences Medical Laboratory and Measurements Technologies
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-215938 (URN)978-91-7729-572-3 (ISBN)
Public defence
2017-11-14, FB42, Albanova, Roslagstullsbacken 21, KTH, Stockholm, 13:00 (English)
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Supervisors
Note

QC 20171018

Available from: 2017-10-18 Created: 2017-10-17 Last updated: 2017-10-18Bibliographically approved

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Etcheverry, SebastiánMargulis, Walter

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