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Article

Photothermal Effect in Plasmonic Nanotip for LSPR Sensing

1
State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
2
Southeast University-Shenzhen Research Institute, Shenzhen 518000, China
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(3), 671; https://doi.org/10.3390/s20030671
Received: 24 December 2019 / Revised: 15 January 2020 / Accepted: 21 January 2020 / Published: 25 January 2020
(This article belongs to the Special Issue Optical Label-Free Sensors)
The influence of heat generation on the conventional process of LSPR based sensing has not been explored thus far. Therefore, a need exists to draw attention toward the heat generation issue during LSPR sensing as it may affect the refractive index of the analyte, leading to incorrect sensory conclusions. This manuscript addresses the connection between the photo-thermal effect and LSPR. We numerically analyzed the heat performance of a gold cladded nanotip. The numerical results predict a change in the micro-scale temperature in the microenvironment near the nanotip. These numerical results predict a temperature increase of more than 20 K near the apex of the nanotip, which depends on numerous factors including the input optical power and the diameter of the fiber. We analytically show that this change in the temperature influences a change in the refractive index of the microenvironment in the vicinity of the nanotip. In accordance with our numerical and analytical findings, we experimentally show an LSPR shift induced by a change in the input power of the source. We believe that our work will bring the importance of temperature dependence in nanotip based LSPR sensing to the fore. View Full-Text
Keywords: optical fiber sensors; localized surface plasmon resonance; nanotip; electromagnetic heating; refractive index optical fiber sensors; localized surface plasmon resonance; nanotip; electromagnetic heating; refractive index
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MDPI and ACS Style

Nisar, M.S.; Kang, S.; Zhao, X. Photothermal Effect in Plasmonic Nanotip for LSPR Sensing. Sensors 2020, 20, 671. https://doi.org/10.3390/s20030671

AMA Style

Nisar MS, Kang S, Zhao X. Photothermal Effect in Plasmonic Nanotip for LSPR Sensing. Sensors. 2020; 20(3):671. https://doi.org/10.3390/s20030671

Chicago/Turabian Style

Nisar, Muhammad S., Siyu Kang, and Xiangwei Zhao. 2020. "Photothermal Effect in Plasmonic Nanotip for LSPR Sensing" Sensors 20, no. 3: 671. https://doi.org/10.3390/s20030671

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