Beitrag zu einer Konferenz, Meeting Abstract
Plasmonic Transmission Gratings - Fabrication and Characterization
Details zur Publikation
Autor(inn)en: | Sierant, A.; Jany, B.; Bartoszek-Bober, D.; Fiutowski, J.; Kawalec, T.; Adam, J. |
Publikationsjahr: | 2016 |
Seitenbereich: | TBD |
Buchtitel: | E-MRS Fall Meeting - Warsaw University of Technology, Warsaw, Poland : Duration: 19. Sept 2016 - 22. Sept 2016 |
URN / URL: |
Zusammenfassung, Abstract
Surface plasmon polaritons (SPPs) are collective electron oscillations,confined at metal-dielectric interfaces. Coupling incident photons to SPPsmay lead to spectrally broad field enhancement and confinement below thediffraction limit [1]. This phenomenon facilitates various applications,including highly sensitive refractive index sensing [2], and plasmonic dipolemirrors for cold atoms [3]. Key to a successful application is a strongphoton-to-SPP coupling. To this end, prism-based coupling is classicallyused, but this method contradicts compact device applications. An alternativerealization is given by the use of a metallic diffraction grating, where thediffracted light couples to the SPP.Here, we propose metallic periodic transmission gratings, processed onto aglass substrate, with various periods and fill factors. The gratings aremilled in a plain gold layer with a focused ion beam (FIB) microscope, usinggallium and a neutralizing electron beam. We investigate the SPP couplingstrength with respect to varying top layers and under collimated,oblique-angled excitation, with respect to the effect of finite gratings asopposed to perfect periodicity. We characterize the proposed plasmonictransmission gratings via near-field optical scanning microscopy (NSOM) andgoniometric far field measurements. We support the evidence of our analyseswith numerical calculations, carried out via rigorous coupled wave analysis(RCWA) and finite-difference in time-domain (FDTD) Simulations.[1] W. L. Barnes, A. Dereux, T. W. Ebbesen, Nature 424, 824–830 (2003)[2] X. D. Hoa, A. G. Kirk, M. Tabrizian, Biosensors and Bioelectronics, 23,2, 151-160 (2007)[3] T. Kawalec, et al., Opt. Lett. 39, 2932 (2014)
Surface plasmon polaritons (SPPs) are collective electron oscillations,confined at metal-dielectric interfaces. Coupling incident photons to SPPsmay lead to spectrally broad field enhancement and confinement below thediffraction limit [1]. This phenomenon facilitates various applications,including highly sensitive refractive index sensing [2], and plasmonic dipolemirrors for cold atoms [3]. Key to a successful application is a strongphoton-to-SPP coupling. To this end, prism-based coupling is classicallyused, but this method contradicts compact device applications. An alternativerealization is given by the use of a metallic diffraction grating, where thediffracted light couples to the SPP.Here, we propose metallic periodic transmission gratings, processed onto aglass substrate, with various periods and fill factors. The gratings aremilled in a plain gold layer with a focused ion beam (FIB) microscope, usinggallium and a neutralizing electron beam. We investigate the SPP couplingstrength with respect to varying top layers and under collimated,oblique-angled excitation, with respect to the effect of finite gratings asopposed to perfect periodicity. We characterize the proposed plasmonictransmission gratings via near-field optical scanning microscopy (NSOM) andgoniometric far field measurements. We support the evidence of our analyseswith numerical calculations, carried out via rigorous coupled wave analysis(RCWA) and finite-difference in time-domain (FDTD) Simulations.[1] W. L. Barnes, A. Dereux, T. W. Ebbesen, Nature 424, 824–830 (2003)[2] X. D. Hoa, A. G. Kirk, M. Tabrizian, Biosensors and Bioelectronics, 23,2, 151-160 (2007)[3] T. Kawalec, et al., Opt. Lett. 39, 2932 (2014)
