, Volume 5, Issue 1, pp 7-12

First online:

A Polarization-Independent SPR Fiber Sensor

  • María-Cruz NavarreteAffiliated withDepartamento de Óptica, Facultad de CC. Físicas, Universidad Complutense
  • , Natalia Díaz-HerreraAffiliated withSección departamental de Óptica, Escuela Universitaria de Óptica, Universidad Complutense Email author 
  • , Agustín González-CanoAffiliated withSección departamental de Óptica, Escuela Universitaria de Óptica, Universidad Complutense
  • , Óscar EstebanAffiliated withDepartamento de Electrónica, Escuela Politécnica, Universidad de Alcalá

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The resonance of surface plasma waves in metallic layers is a strongly polarization-dependent phenomenon by the very nature of the physical effect responsible of that resonance. This implies the necessity of polarization-controlling elements to be added to any operative surface-plasmon-resonance-based sensor. A fully symmetrical, circular-section double deposition of a metallic and a dielectric layer on a uniform-waist tapered optical fiber (SymDL-UWT) permits us to completely eliminate the dependence on polarization of the plasmon excitation, with the corresponding operative advantages and basic theoretical consequences. We depict the fabrication process of these transducers, which is based on the use of a simple and efficient rotating element developed by us, and show the characteristics of the produced devices. No such device has been depicted up to date. As our experimental results show, this kind of devices can be considered a very good option for the development of simple, compact, and efficient chemical and biological sensors.


Fiber-optic sensors Surface plasmon resonance Polarization dependence