Ridge-waveguide-based polarization insensitive Bragg grating refractometer
| Autor: | Robert B. Walker, X. Dai, Claire L. Callender, Stephen J. Mihailov, C. Blanchetière |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Evanescent wave Ridge waveguides business.industry Applied Mathematics Physics::Optics Polarization (waves) law.invention Ultrasonic grating Optics Fiber Bragg grating Refractometer law Blazed grating Optoelectronics business Instrumentation Engineering (miscellaneous) Refractive index |
| Zdroj: | Measurement Science and Technology. 17:1752-1756 |
| ISSN: | 1361-6501 0957-0233 |
| DOI: | 10.1088/0957-0233/17/7/013 |
| Popis: | A highly sensitive waveguide Bragg grating (WBG) sensor for measuring small changes of the refractive index of the surrounding liquid is presented. By using an open top ridge waveguide with a small core, the evanescent field interaction of the guided mode with the liquid analyte on the top of the waveguide is enhanced. The sensitivity measured via a shift in the resonance wavelength of the Bragg grating as high as 1 pm of wavelength shift for a change of 4 × 10−5 in the refractive index around 1.402 is realized. With a polarization insensitive Bragg grating, the polarization dependence of the sensor is improved. A theoretical analysis for the sensitivity of ridge waveguide sensors is given. The experimental results are in good agreement with the theoretical analysis. |
| Databáze: | OpenAIRE |
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