Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Plasmonics and Nanooptics
O 36.3: Poster
Tuesday, March 17, 2015, 18:15–21:00, Poster A
Sensitivity engineering in direct contact Au@Pd nano-sandwich hydrogen sensors — •Nikolai Strohfeldt, Jun Zhao, Andreas Tittl, and Harald Giessen — 4. Physikalisches Institut, Universität Stuttgart
We demonstrate a hydrogen sensing scheme, using complex hybrid plasmonic nanostructures, with stacked gold and palladium nanodisks. So far plasmonics mostly focusses on studying influences of lateral coupling on hybrid plasmonic structures. However, for industry products it would be more feasible to use stacked nanostructures that can be fabricated in one step. We, for the first time, study the influence of stacking order and geometry, experimentally and numerically, to find an optimal arrangement for a hydrogen sensor device. With the best sensing geometry - a stack of gold as lower and palladium as upper disk - we obtain spectral shifts as large as 30 nm at about 4 vol.% H2, which is a strong improvement compared to previous indirect designs. Our samples yield large absorption and scattering signals and are fabricated by low-cost hole-mask colloidal lithography and therefore yield sample sizes over areas of 1 cm2.