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1-Minute Spacer Layer Engineering for Tunable Enhancements in Surface Plasmon-Coupled Emission


In this work, we report green advancements in surface plasmon-coupled emission (SPCE) spacer layer engineering with the shortest preparation time to realize ≥35-fold enhancements in the fluorescence emission intensity. A simple linker free spin coat of polyvinyl alcohol (PVA) dispersed nanoparticles on a SPCE substrate was employed as a spacer layer to achieve tunable enhancements in plasmon-coupled fluorescence emission intensities. Based on the current findings, the enhancements achieved in the SPCE can be tuned simply by varying the nanomaterial and its size. In the technique developed by us, nanomaterials having any capping agent, shape, and origin can be used as a spacer material as the nanomaterials are coated on the silver thin film in the form of a PVA-embedded hybrid spacer without the use of any linker or bond forming chemicals. We also demonstrate the use of biogenic nanoparticles as SPCE spacer layers for enabling tuning of SPCE enhancements.

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Surface plasmon-coupled emission


Metal enhanced fluorescence


Polyvinyl alcohol


Reverse Kretschmann


Surface plasmon resonance


Silver nanoparticles


Gold nanoparticles


Biogenic silver nanoparticles


Biogenic gold nanoparticles


Rhodamine B


3-Aminopropyl triethoxy silane


Free space


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The authors express their gratitude to Sri Sathya Sai Baba, founder-chancellor, Sri Sathya Sai Institute of Higher Learning for his constant guidance. RSS acknowledges the financial support from the Department of Bio-Technology, Govt. of India, under Ramalingaswamy fellowship (No.102/IFD/SAN/1115/2013-14), Department of Science and Technology, Govt. of India, under Fast Track scheme (No.SR/FT/CS-51/2010(G)), and SV acknowledges the UGC-BSR fellowship, Govt. of India.

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Correspondence to Sai Sathish Ramamurthy.

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Venkatesh, S., Ghajesh, S. & Ramamurthy, S.S. 1-Minute Spacer Layer Engineering for Tunable Enhancements in Surface Plasmon-Coupled Emission. Plasmonics 10, 489–494 (2015).

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  • Surface plasmon-coupled emission
  • Nanoparticles
  • Biogenic
  • Spin coating
  • Enhancements