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Photothermal Effect in Plasmonic Nanotip for LSPR Sensing.
Muhammad Shemyal Nisar1,2, Siyu Kang1,2, Xiangwei Zhao1,2
1State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.
Sensors (Basel, Switzerland)
|January 30, 2020
Summary
Heat generation during localized surface plasmon resonance (LSPR) sensing can alter analyte refractive index. This study demonstrates that photothermal effects cause temperature increases, impacting LSPR sensor accuracy.
Area of Science:
- Plasmonics
- Nanophotonics
- Optical Sensing
Background:
- Localized Surface Plasmon Resonance (LSPR) is a widely used sensing technique.
- The influence of heat generation on LSPR-based sensing has not been thoroughly investigated.
- Photothermal effects may impact the accuracy of LSPR sensors by altering the microenvironment.
Purpose of the Study:
- To investigate the connection between the photothermal effect and LSPR.
- To analyze the heat generation in a gold-clad nanotip.
- To understand the impact of temperature changes on LSPR sensing.
Main Methods:
- Numerical analysis of heat performance in a gold-clad nanotip.
- Analytical modeling of temperature effects on the microenvironment's refractive index.
- Experimental validation of LSPR shift due to input power variations.
Main Results:
- Numerical simulations predict a temperature increase exceeding 20 K near the nanotip apex.
- Temperature changes are dependent on input optical power and fiber diameter.
- Experimental results confirm LSPR shifts induced by source power modulation.
Conclusions:
- Photothermal effects significantly influence nanotip-based LSPR sensing.
- Temperature dependence must be considered for accurate LSPR sensor readings.
- This work highlights the importance of thermal management in LSPR sensing applications.
