Optimization of interrogation methods for sensors based on optical microbubble resonators

P. S. S. dos Santos; L. Coelho; P. A. S. Jorge

doi:10.1117/12.2530919

3 October 2019 Optimization of interrogation methods for sensors based on optical microbubble resonators

P. S. S. dos Santos, L. Coelho, P. A. S. Jorge

Proceedings Volume 11207, Fourth International Conference on Applications of Optics and Photonics; 112072S (2019) https://doi.org/10.1117/12.2530919
Event: IV International Conference on Applications of Optics and Photonics (AOP 2019), 2019, Lisbon, Portugal

Abstract

Optical microbubble resonators are among the highest sensitivity optical sensors. In the context of its application in the detection of water micro contaminants, in portable systems, their interrogation must be made by tracking the resonant wavelength peak position with the highest accuracy possible, at a reasonable cost. In this work different laser sources and scanning methods were tested and compared, aiming the development of a portable prototype. Each tunable laser source, was evaluated using a C₂H₂ Gas cell, which provided an absolute wavelength reference. Light transmitted through the cell was recorded using a photodetector and a software controlled feedback loop, enabling locking into selected reference peaks. Three distinct scanning methods were tested and compared for each laser source: large and short-range laser scanning and external waveform dithering, from which minimum standard deviations of 20, 0.18, and 0.07 pm, were obtained, respectively.

Citation Download Citation

P. S. S. dos Santos, L. Coelho, and P. A. S. Jorge "Optimization of interrogation methods for sensors based on optical microbubble resonators", Proc. SPIE 11207, Fourth International Conference on Applications of Optics and Photonics, 112072S (3 October 2019); https://doi.org/10.1117/12.2530919

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