Surface plasmon resonance refractive index sensor based on fiber-interface waveguide inscribed by femtosecond laser
2019; Optica Publishing Group; Volume: 44; Issue: 10 Linguagem: Inglês
10.1364/ol.44.002434
ISSN1539-4794
AutoresYunfang Zhang, Changrui Liao, Chupao Lin, Yu Shao, Ying Wang, Yiping Wang,
Tópico(s)Plasmonic and Surface Plasmon Research
ResumoA novel surface plasmon resonance (SPR) configuration based on fiber-interface waveguide was proposed and realized by combining the technology of femtosecond laser writing waveguide with SPR effect for measuring refractive index (RI) of analyte. A U-shaped waveguide is inscribed in the coreless fiber and its bottom is very close to the fiber surface, which can produce strong evanescent field being sensitive to ambient media. When the fiber surface is coated with a layer of gold film, the strong evanescent field can excite the SPR effect on the fiber surface. Most importantly, different from some types of fiber SPR sensors with a fragile physical structure, the fiber-interface waveguide SPR sensor exhibits an excellent mechanical strength. Such a SPR sensor exhibits a high sensitivity of ∼3352 nm/RIU at the RI value of ∼1.395, which may have important practical applications in medicine, environmental monitoring, and food safety.
Referência(s)