External-resonance-enhanced transmission of light through sub-wavelength holes
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- Kalkum, F., Peter, M., Barbastathis, G. et al. Appl. Phys. B (2010) 100: 169. doi:10.1007/s00340-010-3989-7
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Using plasmonic resonances of metal films, enhanced transmission of light through sub-wavelength holes has been demonstrated. Here we show that external resonances can be employed as well: the transmission of 1.5-μm wavelength light through 600-nm holes is enhanced by a factor of 20 using a Fabry–Pérot arrangement. The maximal enhancement factor is determined by the limited reflectivity of metal surfaces. It seems promising to combine both effects—plasmonic resonances plus tailored photonic-crystal structures on top of the metal film—in order to realize efficient sub-wavelength light sources as they are required for, e.g., advanced spectroscopy and lithography.