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Spiral-Grating Tapered Gold Tip Used for Micro-Nanoscale Multi-Functional Sensing
Rongtao Huang1, Yuxin Chen1, Zhi-Yuan Li1,2
1School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510641, China.
Sensors (Basel, Switzerland)
|January 28, 2026
Summary
This study introduces a novel fiber-integrated microscale spiral-grating tapered gold tip surface plasmon resonance (SPR) sensor. This advanced SPR sensor offers high-resolution detection for liquid diffusion and enhanced microscopy, advancing physicochemical studies.
Area of Science:
- Optoelectronics and Photonics
- Nanotechnology and Nanoscience
- Physical Chemistry
Background:
- Optical fiber surface plasmon resonance (SPR) sensing is a label-free, sensitive, and rapid detection technology.
- Existing SPR sensors have limitations in spatial and temporal resolution for complex microscale phenomena.
- There is a need for advanced optical tools to study microscale physicochemical processes and light-matter interactions.
Purpose of the Study:
- To introduce and characterize a fiber-integrated microscale spiral-grating tapered gold tip SPR sensor.
- To demonstrate the sensor's capability in studying fundamental scientific issues like liquid-liquid diffusion.
- To showcase its application in plasmon-enhanced fluorescence and scanning near-field optical microscopy.
Main Methods:
- Development of a fiber-integrated microscale spiral-grating tapered gold tip SPR sensor.
- Characterization of the sensor's working principle and sensing capabilities, including high space-time resolution.
- Experimental application in liquid-liquid diffusion studies and plasmonic enhanced microscopy techniques.
Main Results:
- The developed SPR microsensor exhibits high space-time resolution for in situ detection.
- Successful application in observing and quantifying liquid-liquid diffusion processes at the microscale.
- Demonstrated utility in plasmon-enhanced fluorescence and scanning near-field optical microscopy.
Conclusions:
- The microscale spiral-grating tapered gold tip SPR sensor is a multifunctional and high-performance sensing tool.
- This technology provides novel optical schemes for investigating complex physicochemical processes.
- It offers advanced capabilities for studying light-matter interactions at microscale and nanoscale levels.
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