Download Optical Characterization of Plasmonic Nanostructures: by Denitza Denkova PDF
By Denitza Denkova
This thesis makes a speciality of a method of acquiring, for the 1st time, complete electromagnetic imaging of photonic nanostructures. the writer additionally develops a different functional simulation framework that's used to verify the consequences.
The improvement of cutting edge photonic units and metamaterials with tailored functionalities relies seriously on to represent them and comprehend the underlying light-matter interactions. therefore, imaging all parts of the electromagnetic mild box at nanoscale answer is of paramount value during this zone. This problem is replied via demonstrating experimentally hollow-pyramid aperture probe SNOM can at once picture the horizontal magnetic box of sunshine in uncomplicated plasmonic antennas – rod, disk and ring. those effects are proven by way of numerical simulations, displaying that the probe should be approximated, to first order, via a magnetic point-dipole resource. This approximation considerably reduces the simulation time and complexity and allows the another way debatable interpretation of near-field pictures. The demonstrated procedure is used to check complicated plasmonic antennas and to discover new possibilities for his or her engineering and characterization.
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Extra resources for Optical Characterization of Plasmonic Nanostructures: Near-Field Imaging of the Magnetic Field of Light
The feedback loop is monitoring these changes in order to keep the desired probe-sample distance constant. This method is very straightforward, but has the disadvantage of damaging both the sample and the tip, due to the strong lateral forces. Therefore another mode has been invented—tapping mode, in which during the lateral scan, the cantilever is oscillated at its resonance frequency in vertical direction. This reduces the damage on the sample and the tip and allows lock-in detection of changes in oscillation amplitude, frequency, phase, thus providing more accurate control of the sampleprobe separation.
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