Flexible and disposable plasmonic refractive index sensor using nanoimprint lithography

Saswat Mohapatra; Rakesh S. Moirangthem

doi:10.1117/12.2299315

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5 March 2018 Flexible and disposable plasmonic refractive index sensor using nanoimprint lithography

Saswat Mohapatra, Rakesh S. Moirangthem

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Proceedings Volume 10714, Third International Conference on Photonics Solutions (ICPS2017); 1071404 (2018) https://doi.org/10.1117/12.2299315
Event: Third International Conference on Photonic Solutions, 2017, Pattaya, Thailand

Abstract

Nanostructure based plasmonic sensors are highly demanding in various areas due to their label-free and real-time detection capability. In this work, we developed an inexpensive flexible plasmonic sensor using optical disc nanograting via soft UV-nanoimprint lithography (UV-NIL). The polydimethylsiloxane (PDMS) stamp was used to transfer the nanograting structure from digital versatile discs (DVDs) to flexible and transparent polyethylene terephthalate (PET) substrate. Further, the plasmonic sensing substrate was obtained after coating a gold thin film on the top of the imprinted sample. The surface plasmon resonance (SPR) modes excited on gold coated nanograting structure appeared as a dip in the reflectance spectra measured at normal incident of white light in ambient air medium. Electromagnetic simulation based on finite element method (FEM) was used to understand and analyze the excited SPR modes and it is a very close agreement with the experimental results. The bulk refractive index (RI) sensing was performed by the sensor chip using water-glycerol mixture with different concentrations. Experimentally, the bulk RI sensitivity was found to be 797±17 nm/RIU.

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Saswat Mohapatra and Rakesh S. Moirangthem "Flexible and disposable plasmonic refractive index sensor using nanoimprint lithography", Proc. SPIE 10714, Third International Conference on Photonics Solutions (ICPS2017), 1071404 (5 March 2018); https://doi.org/10.1117/12.2299315

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