Mid-infrared surface plasmon resonance sensor based on silicon-doped InAs film and chalcogenide glass fiber
Abstract
A fiber-optic surface plasmon resonance (SPR) sensor working in the mid-infrared (mid-IR) region is present. Based on the chalcogenide glass (2S2G) fiber and a silicon-doped InAs film, this mid-IR SPR sensor can work in the wavelength region of 9-16 μm theoretically. The dual-tapered fiber tip structure is employed to narrow absorption valley and increase the detection limit. Simulated results show that the proposed fiber-optic mid-IR SPR sensor can detect refractive index changes from 1.0 to 1.7. The sensitivity of the sensor are 1695 nm/RIU and 4470 nm/RIU for vapor and liquid phase detection, respectively.
- Publication:
-
Optics Laser Technology
- Pub Date:
- December 2019
- DOI:
- 10.1016/j.optlastec.2019.105686
- Bibcode:
- 2019OptLT.12005686Z
- Keywords:
-
- Mid-infrared sensor;
- Surface plasmon resonance;
- Chalcogenide glass fiber;
- Refractive index sensor