Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"near-field optical microscopy"”.
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Characterising nonlinear waveguides by scanning near-field optical microscopy
Scanning near-field optical microscopy (SNOM) has been applied to investigate the dispersion and nonlinear phenomena in a multimode Ta2O5 rectangular waveguide. Unlike the conventional approach of observing only the output spectra, the SNOM technique can collect the localised spectra from the …
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Scattering Scanning Near-Field Optical Microscopy on Anisotropic Dielectrics
Near-field optical microscopy allows the nondestructive examination of surfaces with a spatial resolution far below the diffraction limit of Abbe. In fact, the resolution of this kind of microscope is not at all dependent on the wavelength, but is typically in the range of 10 to 100 nanometers. On …
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An investigation of phase-mask diffraction patterns and fibre Bragg gratings with scanning near-field optical microscopy
In recent years, near-field microscopy has been utilized for assessing the properties of optical wave-guides at an increasing rate. Here, a Scanning Near-field Optical Microscope (SNOM) has been designed and constructed in order to expand this work into an analysis of the optical and structural …
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Partially coherent fields in synthetic optical holography
Synthetic optical holography is a newly proposed method for implementing phase imaging in scanning near-field optical microscopy. It combines high-speed phase imaging, technical simplicity, and simultaneous operation at visible to terahertz frequencies to improve upon competing image acquisition …
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Development of a multipurpose near-field imaging platform
… the high spatial resolution of scanning probe microscopy (SPM) with traditional optical imaging techniques has been revolutionizing for multiple fields - Condensed Matter Physics, Material Science, Chemistry, and Biology. This high potential is met with the special requirements of sub-nanometer …
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Propagation, Scattering and Amplification of Surface Plasmons in Thin Silver Films
… electrons, have a strong influence on the optical properties of metal micro- and nanostructures and are of great interest for novel photonic devices. Here, plasmons on metal-dielectric interfaces are investigated using near-field optical microscopy and differential angular reflectance …
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Optical studies of super-collimation in photonic crystals
… the fabrication of photonic crystals for optical wavelengths. These periodic structures of alternating high-to-low index of refraction materials allow the observation of peculiar effects, in particular, the propagation of optical beams without spatial spreading. This effect, called …
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Electronic properties and microstructure of nanoparticulate silicon systems for diode applications
… nanoparticles. In this thesis scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, and mid-infrared scanning near-field optical microscopy (IR s-SNOM) were employed to investigate the micro-scale as well as the meso-scale structure of …
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Characterization of nanostructured hexagonal boron nitride patterned via high-resolution ion beam lithography
… confined polaritons for technologically relevant near-IR and mid-IR applications. Furthermore, tuning the properties of hexagonal boron nitride, graphene, and other 2D materials in-plane and stacking them into heterostructures has the potential to create hybrid optical, electronic, thermal, and …
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Biospectroscopy investigations Into cervical cytology
… to 30 μm, we assessed the potential of scanning near-field optical microscopy in combination with an IR free electron laser (SNOM-IR-FEL), in determining the biophysical properties of abnormal cervical cells. SNOM-IR-FEL is able to distinguish between normal and various grades of cervical …
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Label-free DNA Sequence Detection Using Oligonucleotide Functionalized Fiber Probe with a Miniature Protrusion
… complementary strand of target DNA increases the optical thickness of the probe. Three kinds of sensors were developed. The optical fiber tip sensor has been demonstrated with good specificity and high sensitivity for target DNA quantities as small as 1.7 ng. To demonstrate the potential of this …
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Photochemical Tuning of Surface Plasmon Resonances in Metal Nanoparticles
… effect. Firstly, the use of single particles as optically active probes for scanning near-field optical microscopy is demonstrated. Secondly, fluorescence enhancement in the vicinity of a single MNP is described theoretically. This description focuses on how the particle diameter and the …
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Interface engineering and multi-modal characterization of co-evaporated metal halide perovskite films for efficient perovskite-silicon tandem solar cells
… layers. Using infrared scattering-type scanning near-field optical microscopy (IR s-SNOM) and, for the first time, demonstrating nanoscale X-ray photoemission electron microscopy (XPEEM) on ultra-thin (5–20 nm) MHP films and buried interfaces, we reveal that insufficient MeO-2PACz coverage …
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Excitation, Interaction, and Scattering of Localized and Propagating Surface Polaritons
… of the surface charges, strongly influence the optical response at the micro- and nanoscale and have to be accounted for in modern nanotechnology. Within this thesis, certain basic phenomena involving surface polaritons are investigated by means of the semianalytical multiple-multipole (MMP) …
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Optical Properties of Individual Nano-Sized Gold Particle Pairs
This thesis examines and exploits the optical properties of pairs of MNPs. Pairs of MNPs offer two further parameters not existent at single MNPs, which both affect the local optical fields in their vicinity: the distance between them, and their relative orientation with respect to the polarisation …
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Příprava a testování SNOM sond speciálních vlastností
Fotonická krystalická vlákna (PCF) představují slibný nástroj pro spojení technik známých z mikroskopie rastrovací sondou, elektronové mikroskopie a systémů pro vstřikování plynu. Přivedení světla a přenos pracovního plynu současně do blízkosti vzorku umístěného uvnitř elektronového mikroskopu …
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Microfluidic-based continuous self-assembly, alignment, and printing of oligopeptides with π-conjugated cores accompanied by advanced single molecule characterization
… through the use of fluorescence correlation microscopy. I measured fluctuations in fluorescence of a stimulated femtovolume to calculate diffusion constants, and thus particle size as a function of time during reaction.We correlated these findings with molecular dynamics simulations to gain …