Polymer lab-on-fiber probe based on Fabry-Perot resonator

In this paper, we present new concept of three-dimensional (3D) Fabry-Perot resonator (FPR) based on a novel IP-Dip polymer. For FPR structure fabrication a 3D laser lithography technique with non-linear two-photon polymerization (TPP) was used. Using single-step fabrication technique based on direct laser writing (DLW), we prepared 3D FPR structure, which was directly integrated at the end of a single mode optical fiber as an effective sensing element for lab-on-fiber (LOF) devices. The proposed FPR consists of IP-Dip structure with 35 μm air cavity. The parameters of FPR structure were numerically proposed and reflection spectrum was simulated by transfer matrix method (TMM). Reflection properties of FPR structure were measured using optical spectrum analyzer (OSA) in near-infrared region around wavelength of 1550 nm. The quality and morphological properties of fabricated FPR structure were analyzed by scanning electron microscope (SEM).