# A Novel Fiber-Optical Fabry–Perot Microtip Sensor for 2-Propanol

## TL;DR

A new fiber-optic sensor was developed to detect 2-propanol gas, which could help in non-invasive disease diagnosis.

## Contribution

A novel fiber-optic Fabry–Perot microtip sensor with high sensitivity to 2-propanol was developed for biomedical applications.

## Key findings

- The sensor showed a sensitivity of −71.1 ± 2.1 pm/ppm to 2-propanol.
- It had a maximum standard deviation of 0.15 nm and a resolution of 3.18 ppm.
- The sensor is stable and easy to fabricate, making it suitable for non-invasive disease detection.

## Abstract

2-Propanol in the gaseous phase of clinical samples can serve as a biomarker for disease diagnosis. In this context, a novel fiber-optic Fabry–Perot (FP) interferometric sensor with a microtip structure was developed using the light-guided induced polymerization technique. The optical fiber sensor (OFS) with the best performance, measuring approximately 15 µm in length, exhibited good sensitivity to 2-propanol, with a response of −71.1 ± 2.1 pm/ppm. Additionally, it demonstrated good stability, with a maximum standard deviation of 0.15 nm and an estimated resolution of 3.18 ppm. The good sensitivity and ease of fabrication of this OFS highlight its potential for biomedical applications, particularly in non-invasive disease detection, given the role of 2-propanol as a biomarker for various health conditions.