Abstract
Lossy mode resonance based sensors have been extensively studied in recent years. The versatility of the lossy mode resonance phenomenon has led to the development of sensors based on different configurations that make use of a wide range of materials. The coating material is one of the key elements in the performance of a refractometer. This review paper intends to provide a global view of the wide range of coating materials available for the development of lossy mode resonance based refractometers.
Highlights
Sensors have acquired an unprecedented presence in modern society
When lossy mode resonance (LMR) is generated in an optical fiber, this phenomenon can be observed as an absorption peak at a given wavelength in the transmission spectra
Aiming to improve the performance of LMR-based refractometers, ZnO thin film was used in a novel structure [42]. This structure consisted of a cladding-removed multimode optical fiber (CRMOF) with a 400 μm core diameter, which was bent in order to achieve a U-shaped fiber, using a dual sensing approach to enhance the accuracy of the refractometer, measuring the LMR shift and the absorbance variation simultaneously
Summary
Medicine, and even in our own homes, we are increasingly relying on a number of sensors to achieve a safer environment and a healthier and more comfortable life [1,2,3,4] As this field evolves, new mechanisms and configurations are researched, which facilitate the development of better sensors and new applications. If the coating possesses certain properties (detailed below), the waveguide modes may couple to the coating modes, generating a lossy mode This effect causes an absorption peak at the wavelength at which the conditions are fulfilled. Provided the coating is stable, the LMR will only be affected by the surrounding media refractive index (SRI), meaning that it is essentially a good mechanism for the development of refractometers. The study of the different coating materials presented here is a proof of the versatility and great potential of this technique, as it has a great range of applications
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