Quarter-mode spoof plasmonic resonator for a microfluidic chemical sensor.

In this paper, we propose a microfluidic chemical sensor based on quarter-mode spoof plasmonic resonators with more compact overall size and higher sensitivity. First, a microfluidic channel engraved on polydimethylsiloxane is aligned to the upper part of the spoof plasmonic metal-insulator-metal (MIM) ring resonator where the strongest electric fields are observed at resonance. Although a resonant frequency shift of 270 MHz has been observed when the microfluidic channel is filled with pure ethanol, there is no resonant frequency shift when the ethanol concentration is changed from 40% to 60%. Then the spoof localized surface plasmons modes on the quarter corrugated MIM ring are analyzed, and a microfluidic sensor based on the quarter-mode spoof plasmonic resonator has been proposed. The proposed microfluidic sensor requires a very small amount (3.9 μL) of liquid for testing. After infilling the microfluidic channel with pure ethanol, the resonant frequency shift of 940 MHz has been observed on account of the dielectric changes. It is observed that the resonant frequency of the proposed sensor shifts from 5.07 to 6.62 GHz when the ethanol concentration is varied from 10% to 90%. It has been demonstrated that such quarter-mode spoof plasmonic resonator is well suited to a highly sensitive and compact microfluidic chemical sensor.