Bias-scanning based tunable LSPR sensor

Abstract

The principle and the characteristics of the bias-scanning based tunable localized surface plasmon resonance (LSPR) sensors for environmental refractive index have been theoretically and numerically investigated in detail. The sensors exhibit linear negative-shifts in the scattering-bias spectral position when the refractive index of the surrounding medium increases. By bias-scanning, a single-wavelength measurement for sensing the environmental refractive index can be realized effectively. In addition, we demonstrate that the sensing performance of the designed sensor can be adjusted by nano-scale manipulations of metal nanoparticles' sizes and shapes. The proposed devices may pave the way for the development of electrochemical sensors that can convert spectrum scanning into bias scanning.

Selective Mid-IR Metamaterial-Based Gas Sensor System: Proof of Concept and Performances Tests

“…This is because the targeted gases mentioned above have their absorption features in this area of the electromagnetic field [ 14 , 15 , 16 , 17 , 18 , 19 ], as one can see in Figure 1 . Mid-IR gas sensor types are different in cost and efficiency, depending on their configuration [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. Some of the most sensitive systems (sensitivity up to parts-per-trillion concentration), such as the mid-infrared sensor system based on continuous-wave (CW) interband cascade laser (ICL) [ 16 ], or those based on Tuneable Diode Laser Absorption Spectroscopy (TDLAS), Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) [ 15 ], include laser as emitting sources.…”