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Proceedings Paper

Liquid core integrated ring resonator
Author(s): Genni Testa; Yujian Huang; Luigi Zeni; Pasqualina M. Sarro; Romeo Bernini
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Paper Abstract

We report the design and the fabrication of an integrated optofluidic ring resonator based on liquid core antiresonant reflecting optical waveguide (ARROW) operating around λ=635nm with a water filled core (nc=1.33). This waveguide permits a strong coupling between light and analyte as the same microchannel can be used for delivering sample and for confining light. A rectangular-shaped ring resonator has been realized by using four 90-bent waveguides and an multimode interference coupler is used for coupling light from the input bus waveguide to the resonator. The resulting device is very compact, with a total length of 2.5 mm and a required liquid volume of about 0.11nl. The device has been simulated with a two dimensional finite-difference time-domain method for different refractive index core nc=1.32 (methanol) and nc=1.43 (dimethylformamide). Moreover, we carried out optical measurements by measuring the transmitted spectrum from the output bus waveguide in both cases. The experimental results confirm that ring with a good quality factor (Q~800) can be achieved in good agreement with the numerical results.

Paper Details

Date Published: 17 January 2011
PDF: 7 pages
Proc. SPIE 7943, Silicon Photonics VI, 794309 (17 January 2011); doi: 10.1117/12.874806
Show Author Affiliations
Genni Testa, Consiglio Nazionale delle Ricerche (Italy)
Yujian Huang, Technische Univ. Delft (Netherlands)
Luigi Zeni, Seconda Univ. degli Studi di Napoli (Italy)
Pasqualina M. Sarro, Technische Univ. Delft (Netherlands)
Romeo Bernini, Consiglio Nazionale delle Ricerche (Italy)

Published in SPIE Proceedings Vol. 7943:
Silicon Photonics VI
Joel A. Kubby; Graham T. Reed, Editor(s)

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