Search

Your search keyword '"Lard, Mercy"' showing total 30 results
Start Over Author "Lard, Mercy"
30 results on '"Lard, Mercy"'

2. Plasmon hybridization in pyramidal metamaterials: a route towards ultra-broadband absorption

Author

Lobet, Michael, Lard, Mercy, Sarrazin, Michael, Deparis, Olivier, and Henrard, Luc

Subjects
Physics - Optics, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Pyramidal metamaterials are currently developed for ultra-broadband absorbers. They consist of periodic arrays of alternating metal/dielectric layers forming truncated square-based pyramids. The metallic layers of increasing lengths play the role of vertically and, to a less extent, laterally coupled plasmonic resonators. Based on detailed numerical simulations, we demonstrate that plasmon hybridization between such resonators helps in achieving ultra-broadband absorption. The dipolar modes of individual resonators are shown to be prominent in the electromagnetic coupling mechanism. Lateral coupling between adjacent pyramids and vertical coupling between alternating layers are proven to be key parameters for tuning of plasmon hybridization. Following optimization, the operational bandwidth of Au/Ge pyramids, i.e. the bandwidth within which absorption is higher than 90%, extends over a 0.2-5.8 micrometers wavelength range, i.e. from UV-visible to mid-infrared, and total absorption (integrated over the operational bandwidth) amounts to 98.0%. The omni-directional and polarization-independent high-absorption properties of the device are verified. Moreover, we show that the choice of the dielectric layer material (Si versus Ge) is not critical for achieving ultra-broadband characteristics, which confers versatility for both design and fabrication. Realistic fabrication scenarios are briefly discussed. This plasmon hybridization route could be useful in developing photothermal devices, thermal emitters or shielding devices that dissimulate objects from near infrared detectors., Comment: 13 pages, 9 figures, accepted for publication in Optics Express

Published
2014
Full Text
View/download PDF

13. Nanofabricated Devices Based on Molecular Motors: Biosensing, Computation and Detection

Author

Lard, Mercy

Subjects
molecular concentration, nanowires, hollow nanowires, nano-fabrication, macromolecular substances, biocomputing, myosin, 2014:Lard [Fysicumarkivet A], Condensed Matter Physics, actin, molecular motors, nano-biosensor
Abstract

The thesis describes the use of molecular motors in nanofabricated devices designed for potential applications in biosensing, computation and detection. We utilize the well-established guiding principles for controlling the motion of actin filaments propelled by myosin molecular motors, and build upon these developments in order to improve upon previously demonstrated techniques, and establish new methods that, we believe, offer significant progress in these fields. One application area, in which use actin filaments and myosin motors, is in biosensing. Here we show that with the use of actomyosin, we can achieve fast concentration, due to the high speed of actin filaments, in a highly miniaturized molecular concentration device. This fast concentration, and small device footprint, will allow for rapid read-out and higher signal-to-noise ratios, of significance for the development of this field. We also demonstrate the use of 1D semiconductor nanowires, coated with an aluminum oxide shell, as light-guides for biosensing. Because of their high surface-area-to-volume ratio, these nanowires are capable of detecting many molecular probes over their total surface area. Each nanowire acts as an individual detector, with a high signal-to-noise ratio. These nanowires may be used for future detection of a variety of molecular probes rapidly and with high sensitivity. We also use actin filaments propelled by myosin motors, to solve a small-scale instance of a mathematical problem encoded in a 2D network of nanoscale channels, as a method of biocomputation. Due to their small size, high speed, low energy cost, and self-propelled motion, we show that molecular motors offer a significant improvement over alternative methods proposed for computing. Here, localized fluorescence interference contrast detectors were proposed as useful components in biocomputation, as a way to achieve more automated readout of large numbers of motile objects, a requirement for scaling in our biocomputation device. We also demonstrate the use of hollow nanowires to achieve transport of actin filaments by myosin motors within the 1D structures, for use in our biocomputation device. These hollow nanowires may also prove useful in the fundamental study of actin and myosin interactions.

Published
2014

25. Cell uptake: Small 5/2010

Author

Chen, Ran, primary, Ratnikova, Tatsiana A., additional, Stone, Matthew B., additional, Lin, Sijie, additional, Lard, Mercy, additional, Huang, George, additional, Hudson, JoAn S., additional, and Ke, Pu Chun, additional

Published
2010
Full Text
View/download PDF

28. Molecular Motor Propelled Filaments Reveal Light-Guidingin Nanowire Arrays for Enhanced Biosensing.

Author

ten Siethoff, Lasse, Lard, Mercy, Generosi, Johanna, Andersson, Håkan S., Linke, Heiner, and Månsson, Alf

Subjects
*BIOSENSORS, *SEMICONDUCTOR nanowires, *MOLECULAR motor proteins, *OPTICAL properties of nanostructured materials, *FLUOROPHORES, *GALLIUM phosphide, *NANOTECHNOLOGY
Abstract

Semiconductor nanowire arrays offersignificant potential for biosensingapplications with optical read-out due to their high surface areaand due to the unique optical properties of one-dimensional materials.A challenge for optical read-out of analyte-binding to the nanowiresis the need to efficiently collect and detect light from a three-dimensionalvolume. Here we show that light from fluorophores attached along severalμm long vertical Al2O3coated galliumphosphide nanowires couples into the wires, is guided along them andemitted at the tip. This enables effective collection of light emittedby fluorescent analytes located at different focal planes along thenanowire. We unequivocally demonstrate the light-guiding effect usinga novel method whereby the changes in emitted fluorescence intensityare observed when fluorescent cytoskeletal filaments are propelledby molecular motors along the wires. The findings are discussed inrelation to nanobiosensor developments, other nanotechnological applications,and fundamental studies of motor function. [ABSTRACT FROM AUTHOR]

Published
2014
Full Text
View/download PDF

29. Optical molecular nanowire sensor

Author

ANTTU NIKLAS, DABKOWSKA ALEKSANDRA, LARD MERCY, LINKE HEINER, MÅNSSON ALF, NIMAN CASSANDRA, OHLSSON JONAS, and PRINZ CHRISTELLE

Abstract

A nanowire molecular sensor comprising a nanowire waveguide (30), a nanowire sidewall (51) functionalized in order to attach a molecule (54), and light emissive point sources (52), wherein the amount of light emitted at an end (53) of the waveguide is dependent of the amount of specific molecules attached to the sidewall of the nanowire.

30. The computational power of parallel network exploration with many bioagents.

Author

Nicolau Jr., Dan V., Lard, Mercy, Korten, Till, van Delft, Falco C. M. J. M., Persson, Malin, Bengtsson, Elina, Månsson, Alf, Diez, Stefan, Linke, Heiner, and Nicolau, Dan V.

Subjects
*DYNAMIC programming, *ALGORITHMS, *COMPUTERS
Abstract

A letter to the editor is presented in response to the article "New biological device not faster than regular computer" by J. Einarsson.

Published
2016
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results