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21 February 2013 Enhanced localized surface plasmonic resonances in dielectric photonic band gap structures: Fabry-Perot nanocavities and photonic crystal slot waveguides
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Abstract
We describe approaches to enhance localized surface plasmons by placing metallic nanoparticles into two different structures: (i) Fabry-Perot (F-P) resonant cavities, and (ii) Photonic crystal slot waveguides. Through synchronization of the plasmonic and resonant modes, electric field at the surface of the nanoparticles is enhanced by a factor of 4~20 compared with the nanoparticles in free space, depending on the device structure and coupling mechanism. We report key differences between the F-P enhancement and the slow-light enhancement to the plasmonic effect in details. This theoretical investigation reveals a new method to strengthen plasmonic resonances and suggests that the sensitivity of existing plasmonic sensors can be further improved if they are integrated with dielectric resonant photonic devices.
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Dihan Hasan and Alan X. Wang "Enhanced localized surface plasmonic resonances in dielectric photonic band gap structures: Fabry-Perot nanocavities and photonic crystal slot waveguides", Proc. SPIE 8632, Photonic and Phononic Properties of Engineered Nanostructures III, 863203 (21 February 2013); https://doi.org/10.1117/12.2005549
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