Kumar, Piragash R M and Venkatesh, A and Moorthy, V H S (2019) Nanopits based novel hybrid plasmonic nanosensor fabricated by a facile nanofabrication technique for bio sensing. Materials Research Express, 6 (11). 1150b6-1. ISSN 2053-1591

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Abstract

Hybrid plasmonic nano sensors that harness the benefits of both localized and propagating surface plasmons are progressing toward practical real-life applications in point-of-care diagnosis. Here, we demonstrate a novel hybrid plasmonic nano sensor composed of random nano pits in Agthin film prepared using a simple, single-step, and cost-effective nano fabrication technique. The nanopits are a symmetric in shape with trench-shaped sharp bottom and possess high as pectratios. Morphology of the nanopits is significantly distinct from other look-a like nano structures such as nano wells, nano slits and nanotrenches. The high bulk sensitivity(1292nm/RIU)of the nano sensor and lowest detectable surface concentration of BSA molecules(0.59–1.1ngmm−2)are better than many of the contemporary nano sensors that include nano well sand nano voids. We postulate the better sensing performanceto result from the Fano-type resonances and unique morphology of hotspots in nanopits

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