Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)

O 34.30: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster E

Optical fiber sensor with concentric circular gold grating sensitive to change of ambient refractive index — •Sabrina Darmawi¹, Shengfei Feng², Torsten Henning¹, Xingping Zhang², and Peter J. Klar¹ — ¹I. Physikalisches Institut, Justus-Liebig-Universität, Heinrich-Buff-Ring 16, 35392 Gießen — ²College of Apllied Sciences, Beijing University of Technology, Beijing 100124

Metallic nanostructures on top of the end facet of an optical fiber can be employed as probes or sensors. Due to their flexibility, durability and large aspect ratio, optical fibers are well-suited for remote sensing. We present a polarization-independent optical sensor consisting of a concentric gold ring grating with a period of 900 nm transferred onto the end facet of an optical fiber. The sensing function of the device is realized by sending white light through the unstructured end and collecting the reflected response signal. A distinct peak due to the Rayleigh anomaly of the gold ring grating is observed in the reflection sprectrum. We show that this peak is sensitive to the change in the environmental refractive index of the end facet of the fiber.