A compact optical chip for refractive sensing based on cut-off enhanced modal coupling changes
| Autor: | Paul Lambeck, Joris van Lith, Remco Stoffer, Fehmi Civitci, Hugo Hoekstra |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Modal coupling
Materials science business.industry Metals and Alloys Mode (statistics) Condensed Matter Physics Chip Surfaces Coatings and Films Electronic Optical and Magnetic Materials Wavelength Optics Materials Chemistry Range (statistics) Optoelectronics Cut-off Electrical and Electronic Engineering business Leaky mode Instrumentation Refractive index |
| Zdroj: | Sensors and Actuators B: Chemical. 205:111-119 |
| ISSN: | 0925-4005 |
| Popis: | A novel type of integrated optical sensor has been evaluated theoretically. The sensing is based on the large effect of the refractive index of the measurand (generally a liquid) to the mode profile of a guided mode close to the cut-off. A special type turns over into a leaky mode-based sensor. The sensor has small size and is simple to fabricate. For the SiON technology-based structures used as a vehicle for the evaluation, a resolution of the refractive index in the range of 10−6 RIU has been achieved; however, with an operation range around a certain working index of ≈2 × 10−4 RIU only. This working index can be shifted to any desired value, within a certain range, by appropriately choosing the geometrical and material parameters. Because of technological tolerances, for practical operation, read-out based on wavelength scanning is required. The sensor can be used especially as an alarming sensor. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect