| 1. |
- Dahlin, E, et al.
(författare)
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Impaired vibrotactile sense at low frequencies in fingers in autoantibody positive and negative diabetes.
- 2013
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Ingår i: Diabetes Research and Clinical Practice. - : Elsevier BV. - 1872-8227 .- 0168-8227. ; 100:2, s. 46-50
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Tidskriftsartikel (refereegranskat)abstract
- Vibration thresholds in index and little finger pulps in subjects with autoantibody [GADA, IA-2A and/or ICA] positive and negative diabetes 20 years after diagnosis were higher than in age-matched controls at low frequencies (8 and 16Hz), irrespective of HbA1c values, indicating selective impairment of Meissner's corpuscles and/or their innervating axons.
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| 2. |
- Dahlin, T., et al.
(författare)
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Data quality quantification for time domain IP data acquired at a former waste deposit in Lund
- 2012
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Konferensbidrag (refereegranskat)abstract
- Tests were done measuring resistivity and time domain induced polarisation using standard multi-core cable spreads and a special layout with separate cable spreads for transmitting current and measuring potentials. For both types of cables spreads both normal and reciprocal measurements were done in order to estimate the measurement errors. The tests were done on a former landfill in Lund in Sweden. The electrode contact was favourable with resistances of some hundred ohm. The results gave low average error levels for both types of cable spreads, but the single cable spread showed a larger variation with more scatter in the IP data. Data for both types of spreads gave very consistent models that delineate the lateral distribution of waste as well as the contaminant leachate flow path. The results agree well with observations of contaminant outflow and test pit results. It is concluded that the standard approach with a single cable spread is adequate for a site with favourable characteristics as the one studied here.
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| 3. |
- Dahlin, Andreas, 1980, et al.
(författare)
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Electrochemical plasmonic sensors
- 2012
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Ingår i: Analytical and Bioanalytical Chemistry. - : Springer Science and Business Media LLC. - 1618-2642 .- 1618-2650. ; 402:5, s. 1773-1784
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Forskningsöversikt (refereegranskat)abstract
- The enormous progress of nanotechnology during the last decade has made it possible to fabricate a great variety of nanostructures. On the nanoscale, metals exhibit special electrical and optical properties, which can be utilized for novel applications. In particular, plasmonic sensors including both the established technique of surface plasmon resonance and more recent nanoplasmonic sensors, have recently attracted much attention. However, some of the simplest and most successful sensors, such as the glucose biosensor, are based on electrical readout. In this review we describe the implementation of electrochemistry with plasmonic nanostructures for combined electrical and optical signal transduction. We highlight results from different types of metallic nanostructures such as nanoparticles, nanowires, nanoholes or simply films of nanoscale thickness. We briefly give an overview of their optical properties and discuss implementation of electrochemical methods. In particular, we review studies on how electrochemical potentials influence the plasmon resonances in different nanostructures, as this type of fundamental understanding is necessary for successful combination of the methods. Although several combined platforms exist, many are not yet in use as sensors partly because of the complicated effects from electrochemical potentials on plasmon resonances. Yet, there are clearly promising aspects of these sensor combinations and we conclude this review by discussing the advantages of synchronized electrical and optical readout, illustrating the versatility of these technologies.
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| 4. |
- Dahlin, Andreas, 1980, et al.
(författare)
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Plasmonic Nanopores in Metal-Insulator-Metal Films
- 2014
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Ingår i: Advanced Optical Materials. - : Wiley. - 2195-1071. ; 2:6, s. 556-564
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Tidskriftsartikel (refereegranskat)abstract
- A novel type of plasmonic nanopore array in a metal-insulator-metal thin film is presented. The optical properties of this structure are described using a generic theoretical framework for surface waves in a coupled multilayer system. The characteristic spacing (short-range order) of the pores enables grating-type coupling to hybridized surface plasmons, with stronger coupling to some modes than others. The nature of the optical resonances and their excitation mechanisms can be conceptually understood from a charge distribution argument. The experimental results are further verified by numerical simulations, which also enable visualization of the near field. This study illustrates the surface plasmon characteristics (sensitive to periodicity) of the extinction maximum in the asymmetric spectral resonance induced by aperture arrays, while the transmission maximum corresponds to a resonance of localized character (sensitive to pore shape). Finally, the use of these nanopores for sensing applications through changes in the refractive index is evaluated.
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| 5. |
- Dahlin, T., et al.
(författare)
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Pilot study of using resistivity-IP, magnetometry and slingram for separation of industrial waste
- 2012
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Ingår i: Near surface geoscience 2012.
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Konferensbidrag (refereegranskat)abstract
- A controlled experiment was carried out by doing geophysical measurements on a purpose-built heap consisting of two different industrial waste fractions, called NF ( non-ferrous metal) and SLF (shredder light fraction), from the recycling plant of Stena Metall in Halmstad, Sweden. The purpose of the experiment was to see if it was possible to distinguish the different types of material using geophysics. Resistivity-IP, magnetics and slingram were measured over the test heap. The results gave distinctly different signatures for the different materials. In conclusion the test shows a large potential for the tested methods for material characterisation of buried waste in connection with landfill mining.
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| 6. |
- Dahlin, T., et al.
(författare)
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Resistivity-ip characterisation and short term monitoring at filborna waste deposit
- 2012
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Ingår i: 74th European Association of Geoscientists and Engineers Conference and Exhibition 2012 Incorporating SPE EUROPEC 2012 : Responsibly Securing Natural Resources - Responsibly Securing Natural Resources. - 9781629937908 ; , s. 4667-4671
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Konferensbidrag (refereegranskat)abstract
- Buried waste in old landfills is an increasing problem as cities expand and grow into areas with former waste deposits. In order to be able to manage and as far as possible reclaim land in such areas, better tools are needed for mapping and characterisation of buried waste and contaminated land. Other problems associated with landfills are leachate water and methane emissions. In the results presented internal landfill structure was successfully mapped using a combination of resistivity and time-domain IP. Differences in electrical properties can be related to different types of materials, and the groundwater level is outlined. Furthermore the results indicate that leachate water migrates into a former stream under the landfill. Variations in resistivity linked to variation in fluid and gas content were captured by short term monitoring. A rainfall event that occurred during the monitoring period acts as an infiltration test and the changes in resistivity outlines the water migration pattern. The results show the potential of resistivity monitoring for tracing fluid migration in the ground, and also shows patterns that may be due to increasing gas contents in line with previous studies.
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| 7. |
- Ikenoya, Y., et al.
(författare)
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Optical Resonances in Short-Range Ordered Nanoholes in Ultrathin Aluminum/Aluminum Nitride Multilayers
- 2013
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Ingår i: Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 117:12, s. 6373-6382
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Tidskriftsartikel (refereegranskat)abstract
- Nanoholes with short-range ordering were fabricated in ultrathin aluminum/aluminum nitride multilayer films where each layer is as thin as a few nanometers. Optical resonances of the trilayer system with a single metallic layer and five-layer system with two metallic layers were successfully tuned in the visible-near-infrared (vis/NIR) range. The resonance wavelength as well as the width can be predicted and designed by solving the dispersion relation and comparing with the lateral dimension of the short-range ordering. To solve the dispersion relation, we developed a general formulation for multilayer systems. The thermal stability of the fabricated nanoholes in ultrathin multilayers was also tested by vacuum annealing the samples up to 400 degrees C. While no structural change of the nanohole or the multilayer surface has been observed, the optical property showed almost no change in the resonance confirming no structural change but emergence of the interband transition!
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| 8. |
- Junesch, Juliane, 1987, et al.
(författare)
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Optical Properties of Nanohole Arrays in Metal-Dielectric Double Films Prepared by Mask-on-Metal Colloidal Lithography
- 2012
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Ingår i: ACS Nano. - : American Chemical Society (ACS). - 1936-086X .- 1936-0851. ; 6:11, s. 10405-10415
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Tidskriftsartikel (refereegranskat)abstract
- We present the fabrication and optical characterization of plasmonic nanostructures consisting of nanohole arrays in two thin films, a metal and a dielectric. A novel method called mask-on-metal colloidal lithography is used to prepare high aspect ratio holes, providing efficient mass fabrication of stable structures with close to vertical walls and without the need for an adhesion layer under the metal. Our approach for understanding the transmission properties is based on solving the dispersions of. the guided modes supported by the two films and calculating the Influence from interference. The methodology is generic and can be extended to multilayered films. In particular, the influence from coupling to waveguide modes is discussed. We show that by rational design of structural dimensions It Is possible to study only bonding surface plasmons and the associated hole transmission maximum. Further, numerical simulations with the multiple multipole program provide good agreement with experimental data and enable visualization of the asymmetric near field distribution in the nanohole arrays, which is focused to the interior of the "nanowells". The refractometric sensitivity Is evaluated-experimentally both by liquid bulk changes and surface adsorption. We demonstrate how the localized mode provides reasonably good sensitivity in terms of resonance shift to molecular binding inside-the voids. Importantly, high resolution sensing can be accomplished also for the surface plasmon mode, despite its extremely low figure of merit. This is accomplished by monitoring the coupling efficiency of light to plasmons instead of conventional sensing which is based on changes in plasmon energy We suggest that these nanohole structures can be used for studying molecular transport through nanopores and the behavior of molecules confined in volumes of approximately one attoliter.
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| 10. |
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