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Quarter-mode spoof plasmonic resonator for a microfluidic chemical sensor.
Applied Optics
|November 22, 2018
Summary
We developed a compact microfluidic chemical sensor using quarter-mode spoof plasmonic resonators. This sensor achieves high sensitivity for detecting ethanol concentration changes with minimal sample volume.
Area of Science:
- Plasmonics
- Microfluidics
- Chemical Sensing
Background:
- Spoof plasmonic resonators offer potential for miniaturized sensing devices.
- Metal-insulator-metal (MIM) ring resonators are sensitive to changes in their dielectric environment.
Purpose of the Study:
- To propose a novel microfluidic chemical sensor with enhanced sensitivity and compact size.
- To investigate the performance of quarter-mode spoof plasmonic resonators for chemical sensing applications.
Main Methods:
- Fabrication of a microfluidic channel on polydimethylsiloxane (PDMS).
- Integration of the microfluidic channel with a quarter-mode spoof plasmonic metal-insulator-metal (MIM) ring resonator.
- Analysis of resonant frequency shifts in response to varying ethanol concentrations.
Main Results:
- A significant resonant frequency shift of 940 MHz was observed with pure ethanol due to dielectric changes.
- The sensor demonstrated a measurable frequency shift from 5.07 to 6.62 GHz across ethanol concentrations from 10% to 90%.
- The proposed sensor requires a minimal sample volume of 3.9 μL.
Conclusions:
- Quarter-mode spoof plasmonic resonators are suitable for highly sensitive and compact microfluidic chemical sensors.
- The developed sensor shows promise for accurate detection of chemical analytes.
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