Abstract
We describe a highly sensitive refractive index sensor based on a twin-core coupler in an all-solid photonic bandgap guiding optical fiber. A single hole acts as a microfluidic channel for the analyte, which modifies the coupling between the cores, and avoids the need for selective filling. By operating in the bandgap guiding regime the proposed sensor is capable of measuring refractive indices around that of water, and because the analyte varies the coupling coefficient (i.e., instead of phase matching condition) the device is capable of both high sensitivity and a relatively large dynamic range.
| Original language | English |
|---|---|
| Journal | I E E E Sensors Journal |
| Volume | 10 |
| Issue number | 7 |
| Pages (from-to) | 1192-1199 |
| ISSN | 1530-437X |
| DOIs | |
| Publication status | Published - 2010 |
Bibliographical note
Copyright 2010 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.Keywords
- photonic bandgap fiber
- fiber sensor
- directional coupler
- refractive index sensor