Abstract: Spectroscopic analysis is a commonly used tool in the study of liquid samples to investigate their composition and/or properties. Techniques such as fluorescence spectroscopy, absorption or transmission spectroscopy, and scattering spectroscopy examine materials based on their interaction with light. In this context, optical methods often require large and complex laboratory equipment. This work presents a device for integrating emitted light in liquid sample spectroscopy processes, utilizing a set of fibers distributed around a well in which a droplet of the sample is deposited. Optical simulation software is employed to define the geometric parameters of the design, including the size and the depth of the well, to maximize light capture. The design of the well incorporates channels as fibers access points to securely hold the fibers in the required positions, ensuring precise positioning and stable interaction with the light emitted by the sample. Then, the ultrafast laser-assisted etching (ULAE) technique is considered for fabrication. ULAE is a laser-based subtractive manufacturing technique involving two steps: laser irradiation followed by wet chemical etching, providing micrometric precision. Finally, the fabricated configuration is validated through the analysis of known samples. This device is expected to be applicable in fields ranging from analytical chemistry to environmental analysis, such as water quality analysis.

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