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11 April 2019 Modelling and fabrication of novel SERS sensor chips for chemical and biological sensing applications
Yashna Sharma, Rajib R. Ghosh, Mangesh Jaiswal, Anuj Dhawan
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Proceedings Volume 11028, Optical Sensors 2019; 1102830 (2019) https://doi.org/10.1117/12.2524931
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic
Abstract
This paper presents hybrid plasmonic substrates fabricated by a combination of bottom-up and top-down process of fabrication which can be employed as efficient Surface enhanced Raman scattering (SERS) substrates for chemical sensing. The hybrid approach leads to a cost-efficient fabrication with smaller fabrication times than the pure top-down approach and higher degree of control than the pure bottom-up approach. We demonstrate the achievement of sub-20 nm gaps on a large area with this hybrid methodology. These small gaps lead to the formation of electromagnetic hotspots, i.e., regions of high electromagnetic enhancement. The electromagnetic behavior of these substrates is analyzed theoretically using Finite Difference Time Domain modeling. The sub-20 nm gaps lead to the electromagnetic SERS enhancements of the order of ∼108, and a change in the gap size can tune the plasmon resonance wavelength from the visible to the near-IR region of the spectrum. It is thus shown that these SERS substrates offer high SERS enhancement along with a capability of passive tunability of the plasmon resonance wavelength by changing the geometrical parameters in these substrates.
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Yashna Sharma, Rajib R. Ghosh, Mangesh Jaiswal, and Anuj Dhawan "Modelling and fabrication of novel SERS sensor chips for chemical and biological sensing applications", Proc. SPIE 11028, Optical Sensors 2019, 1102830 (11 April 2019); https://doi.org/10.1117/12.2524931
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KEYWORDS
Nanoparticles
Nanolithography
Plasmonics
Plasmons
Finite-difference time-domain method
Nanostructures
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