Imaging of near-field interference patterns by a-SNOM – influence of illumination wavelength and polarization state
| Autor: | Petr Dvořák, Tomáš Šamořil, J. Spousta, Peter Varga, Zoltán Édes, Vlastimil Křápek, Filip Ligmajer, Radek Kalousek, Michal Kvapil, Petr Dub, Tomáš Šikola, Martin Hrtoň |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
spectroscopy
složky Physics::Optics Near and far field 02 engineering and technology spektroskopie 01 natural sciences plasmonics law.invention components Optics law 0103 physical sciences 010306 general physics Plasmon Physics business.industry plazmonika Polarizer 021001 nanoscience & nanotechnology Polarization (waves) Surface plasmon polariton Atomic and Molecular Physics and Optics Supercontinuum Wavelength interferometrické zobrazování interferometric imaging Near-field scanning optical microscope 0210 nano-technology business |
| Zdroj: | OPTICS EXPRESS. 2017, vol. 25, issue 14, p. 16560-16573. |
| Popis: | Scanning near-field optical microscopy (SNOM) in combination with interference structures is a powerful tool for imaging and analysis of surface plasmon polaritons (SPPs). However, the correct interpretation of SNOM images requires profound understanding of principles behind their formation. To study fundamental principles of SNOM imaging in detail, we performed spectroscopic measurements by an aperture-type SNOM setup equipped with a supercontinuum laser and a polarizer, which gave us all the degrees of freedom necessary for our investigation. The series of wavelength- and polarization-resolved measurements, together with results of numerical simulations, then allowed us to identify the role of individual near-field components in formation of SNOM images, and to show that the out-of-plane component generally dominates within a broad range of parameters explored in our study. Our results challenge the widespread notion that this component does not couple to the a-SNOM probe and indicate that the issue of SNOM probe sensitivity towards the in-plane and out-of-plane near-field components – one of the most challenging tasks of near field interference SNOM measurements – is not yet fully resolved. Článek se zabývá vlivem jednotlivých komponent blízkého pole na tvar interferenčních obrazců měřených pomocí rastrovací optické mikroskopie v blízkém poli. |
| Databáze: | OpenAIRE |
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