Sensitivity enhancement of integrated optical sensors by use of thin high-index films
Quigley, G R, Harris, R D and Wilkinson, J S (1999) Sensitivity enhancement of integrated optical sensors by use of thin high-index films. Applied Optics, 38, (28), 6036-6039.
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Description/Abstract
The proportion of power carried in the superstrate medium by the guided modes of integrated optical waveguides can be increased by the addition of a thin high index film. Enhanced refractive index sensing is demonstrated using channel waveguide Mach-Zehnder interferometers with Ta<sub>2</sub>O<sub>5</sub> overlayers. Sensitivity increases by a factor greater than 50, and a detection limit better than 5x10<sup>−7</sup> are obtained. This approach is broadly applicable to sensing at waveguide surfaces where the strength of evanescent fields dictates performance.
| Item Type: | Article |
|---|---|
| Related URLs: | http://www.orc.soton.ac.uk/vie...l?pid=1917 |
| Divisions: | Faculty of Physical and Applied Science > Optoelectronics Research Centre |
| ePrint ID: | 254660 |
| Deposited On: | 02 Apr 2001 |
| Last Modified: | 02 Mar 2012 14:03 |
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