Micro-optoelectromechanical Systems (MOEMS)

Volume refractometry of liquids using stable optofluidic Fabry–Pérot resonator with curved surfaces

[+] Author Affiliations
Noha Gaber, Frédéric Marty, Dan Angelescu, Elodie Richalot, Tarik Bourouina

Université Paris-Est, ESCYOM EA 2552, ESIEE Paris, UPEM, Marne-la-Vallée, 2 Boulevard Blaise Pascal, Noisy-le-Grand Cedex 93162, France

Yuto Takemura

Kagawa University, 2217-20 Hayashi-Cho, Takamatsu, Kagawa 761-0396, Japan

Diaa Khalil

Ain-Shams University, Faculty of Engineering, 1 El Sarayat Street, Abbasseya, Cairo 11517, Egypt

J. Micro/Nanolith. MEMS MOEMS. 14(4), 045501 (Oct 28, 2015). doi:10.1117/1.JMM.14.4.045501
History: Received May 24, 2015; Accepted September 25, 2015
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Abstract.  This work reports a simple, miniaturized optical sensing module for liquid refractometry. It is based on a stable Fabry–Pérot resonator consisting of two silicon cylindrical mirrors with a cylindrical lens in between. The lens is formed by a capillary tube through which the analyte passes. This setup enables volume refractometry, where light propagates through the sample realizing high-interaction depth. The cylindrical surfaces achieve light confinement, reducing the light escaping loss encountered in classical cavities with straight mirrors; hence, a high-quality factor (Q) over 1000 is attained. Exploiting this high Q, we adopt the refractive index (RI) measurement criterion: operating at a fixed wavelength and detecting the power drop as a consequence to the spectral shift with RI change. This technique showed that measuring RI change Δn above the RI of the reference solution can be determined for 0.0023<Δn<0.0045. Sensitivity up to 4094dBm/RIU is achieved. A wider range is still achievable by the conventional method of tracing the shift in peak wavelengths: a range of Δn=0.0163RIU can be scanned, with a sensitivity of 221nm/RIU. Error analysis has been accomplished, and the device’s design parameters are discussed to evaluate the performance.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Noha Gaber ; Yuto Takemura ; Frédéric Marty ; Diaa Khalil ; Dan Angelescu, et al.
"Volume refractometry of liquids using stable optofluidic Fabry–Pérot resonator with curved surfaces", J. Micro/Nanolith. MEMS MOEMS. 14(4), 045501 (Oct 28, 2015). ; http://dx.doi.org/10.1117/1.JMM.14.4.045501


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