Directivity Enhanced Raman Spectroscopy Using Nanoantennas
作者： Aftab Ahmed , Reuven Gordon , None
DOI: 10.1021/NL200461W
关键词: Raman scattering 、 Directivity 、 Ground plane 、 Ion beam 、 Optics 、 Numerical aperture 、 Focused ion beam 、 Raman spectroscopy 、 Coherent anti-Stokes Raman spectroscopy 、 Materials science
摘要: Directing the emission from optical emitters is highly desired for efficient detection and, by reciprocity, excitation as well. As a scattering process, Raman benefits directivity enhancements in both and emission. Here we demonstrate enhanced (DERS) using nanoantenna fabricated focused ion beam milling. The uses resonant ring-reflector to shape emitted achieve DERS—this configuration most similar waveguide antenna. ring reflector boosts measured signal factor of 5.5 (as compared ground plane alone), these findings are quantitative agreement with comprehensive numerical simulations. present design nearly optimal sense that almost all power coupled into aperture microscope. Furthermore, directed out plane, so this can be used DERS conventional microscopes, which has yet a...
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