Simultaneous measurement of refraction and absorption with an integrated near-infrared Mach–Zehnder interferometer
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https://hdl.handle.net/10037/36704Date
2024-05-22Type
Journal articleTidsskriftartikkel
Author
Torres-Cubillo, Antonia; Sánchez-Postigo, Alejandro; Jagerska, Jana; Wangüemert-Pérez, J. Gonzalo; Halir, RobertAbstract
Most integrated evanescent-field photonic sensors measure changes in either the real part or the imaginary part of the complex refractive index of the sample, i.e., refraction or absorption. Here we propose and experimentally demonstrate a near-infrared sensor based on a silicon nitride Mach-Zehnder interferometer which provides a direct measurement of the complex refractive index. Our architecture exhibits a high sensitivity, achieving limits of detection below 2·10−6 RIU for both the real and imaginary parts of the refractive index. We furthermore show that our sensor can be employed as an integrated dispersion spectrometer. Keywords: Integrated photonics, Refraction sensor, Absorption sensor, Dispersion spectroscopy, Mach-Zehnder interferometer, Coherent phase detection
Publisher
ElsevierCitation
Torres-Cubillo, Sánchez-Postigo, Jagerska, Wangüemert-Pérez, Halir. Simultaneous measurement of refraction and absorption with an integrated near-infrared Mach–Zehnder interferometer. Optics and Laser Technology. 2024;177Metadata
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