| 91. |
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| 92. |
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Transnationella rum : diaspora, migration och gränsöverskridande relationer
- 2007. - 1
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Samlingsverk (redaktörskap) (övrigt vetenskapligt/konstnärligt)abstract
- Internationell migration och ökade etniska spänningar har skapat förutsättningar för utvecklingen av sociala, politiska och ekonomiska relationer som överskrider nationsgränser. Gränslösa gemenskaper uppstår där människor och platser knyts samman i ett globalt rum. De båda begreppen transnationalism och diaspora är centrala inom detta nydanande forskningsområde. Boken Transnationella rum ger nya insikter och perspektiv på identiteter och kulturella processer i en värld som länkats ihop av globaliseringen.
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| 93. |
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| 94. |
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| 95. |
- Wetterskog, Erik, et al.
(författare)
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Size and property bimodality in magnetic nanoparticle dispersions : single domain particles vs. strongly coupled nanoclusters
- 2017
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Ingår i: Nanoscale. - : ROYAL SOC CHEMISTRY. - 2040-3364 .- 2040-3372. ; 9:12, s. 4227-4235
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Tidskriftsartikel (refereegranskat)abstract
- The widespread use of magnetic nanoparticles in the biotechnical sector puts new demands on fast and quantitative characterization techniques for nanoparticle dispersions. In this work, we report the use of asymmetric flow field-flow fractionation (AF4) and ferromagnetic resonance (FMR) to study the properties of a commercial magnetic nanoparticle dispersion. We demonstrate the effectiveness of both techniques when subjected to a dispersion with a bimodal size/magnetic property distribution: i.e., a small superparamagnetic fraction, and a larger blocked fraction of strongly coupled colloidal nanoclusters. We show that the oriented attachment of primary nanocrystals into colloidal nanoclusters drastically alters their static, dynamic, and magnetic resonance properties. Finally, we show how the FMR spectra are influenced by dynamical effects; agglomeration of the superparamagnetic fraction leads to reversible line-broadening; rotational alignment of the suspended nanoclusters results in shape-dependent resonance shifts. The AF4 and FMR measurements described herein are fast and simple, and therefore suitable for quality control procedures in commercial production of magnetic nanoparticles.
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| 96. |
- Wiberg, Andreas, 1978, et al.
(författare)
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Dispersion-Tolerant Millimeter-Wave Photonic Link Using Polarization-Dependent Modulation
- 2007
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Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 25:10, s. 2984-2991
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Tidskriftsartikel (refereegranskat)abstract
- A novel technique to modulate one carrier in a dual–carrier millimeter-wave (mm-wave) photonic system is presented and experimentally evaluated. The technique utilizes the polarization dependence of an optical phase modulator and the properties of optical heterodyning and is demonstrated for both amplitudeand phase-modulated mm-wave signal outputs. Experimental verification of the technique is presented with transmission of up to 2.5-Gb/s nonreturn-to-zero data, multilevel quadratic-amplitude modulation, and IEEE 802.11a WLAN data signals on a 40-GHzcarrier over optical fiber and wireless transmission. The tolerance for fiber dispersion is investigated, and penalty-free transmission over 44 km is verified. The linearity of the system is evaluated by measuring the spurious-free dynamic range.
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| 97. |
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| 98. |
- Wiberg, Andreas, 1978, et al.
(författare)
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Single Cycle Subcarrier Modulation
- 2009
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Ingår i: 2009 Conference on Optical Fiber Communication, OFC 2009; San Diego, CA; United States; 22 March 2009 through 26 March 2009. - Washington, D.C. : OSA. - 9781557528650 ; , s. OTuE1-
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Konferensbidrag (refereegranskat)abstract
- We report experimental demonstration of a concept of subcarrier modulation with the symbol rate and carrier frequency being identical, and thereby synchronous. The concept is demonstrated with 2.5 Gsymbols/s signals generated with binary digital electronics.
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| 99. |
- Yankovich, Andrew, 1983, et al.
(författare)
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Multidimensional Hybridization of Dark Surface Plasmons
- 2017
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Ingår i: ACS Nano. - : American Chemical Society (ACS). - 1936-086X .- 1936-0851. ; 11:4, s. 4265-4274
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Tidskriftsartikel (refereegranskat)abstract
- Synthetic three-dimensional (3D) nanoarchitectures are providing more control over light matter interactions and rapidly progressing photonic-based technology. These applications often utilize the strong synergy between electromagnetic fields and surface plasmons (SPs) in metallic. nanostructures. However, many of the SP interactions hosted by complex 3D nanostructures are poorly understood because they involve dark hybridized states that are typically undetectable with far-field optical spectroscopy. Here, we use experimental and theoretical electron energy loss spectroscopy to elucidate dark SPs and their interactions in layered metal-insulator-metal disc nanostructures. We go beyond the established dipole SP hybridization analysis by, measuring breathing and multipolar SP hybridization. In addition, we reveal multidimensional SP hybridization that simultaneously utilizes in-plane and out-of-plane SP coupling. Near-field classic electrodynamics calculations provide excellent agreement with all experiments. These results advance the fundamental understanding of SP hybridization in 3D nanostructures and provide avenues to further tune the interaction between electromagnetic fields and matter.
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| 100. |
- Yankovich, Andrew, 1983, et al.
(författare)
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Visualizing Spatial Variations of Plasmon-Exciton Polaritons at the Nanoscale Using Electron Microscopy
- 2019
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Ingår i: Nano Letters. - : American Chemical Society (ACS). - 1530-6992 .- 1530-6984. ; 19:11, s. 8171-8181
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Tidskriftsartikel (refereegranskat)abstract
- Polaritons are compositional light-matter quasiparticles that have enabled remarkable breakthroughs in quantum and nonlinear optics, as well as in material science. Recently, plasmon-exciton polaritons (plexcitons) have been realized in hybrid material systems composed of transition metal dichalcogenide (TMDC) materials and metal nanoparticles, expanding polaritonic concepts to room temperature and nanoscale systems that also benefit from the exotic properties of TMDC materials. Despite the enormous progress in understanding TMDC-based plexcitons using optical-based methods, experimental evidence of plexcitons formation has remained indirect and mapping their nanometer-scale characteristics has remained an open challenge. Here, we demonstrate that plexcitons generated by a hybrid system composed of an individual silver nanoparticle and a few-layer WS2 flake can be spectroscopically mapped with nanometer spatial resolution using electron energy loss spectroscopy in a scanning transmission electron microscope. Experimental anticrossing measurements using the absorption-dominated extinction signal provide the ultimate evidence for plexciton hybridization in the strong coupling regime. Spatially resolved EELS maps reveal the existence of unexpected nanoscale variations in the deep-subwavelength nature of plexcitons generated by this system. These findings pioneer new possibilities for in-depth studies of the local atomic structure dependence of polariton-related phenomena in TMDC hybrid material systems with nanometer spatial resolution.
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