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High Performance Polymeric Fabry-Pérot Microcavities for Sensing and Lasing Applications.

Genni Testa¹, Vito Coviello¹, Gianluca Persichetti¹

¹Institute for Electromagnetic Sensing of the Environment (IREA), National Research Council (CNR), Via Diocleziano 328, 80124 Naples, Italy.

|September 27, 2025

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We developed fully polymer-based Fabry-Pérot microcavities for sensing and lasing. These cost-effective devices show high performance for refractive index sensing and low-threshold lasing, paving the way for disposable photonic sensors and biolasers.

Area of Science:

Photonics and Materials Science
Optoelectronics and Sensor Technology

Background:

Fabry-Pérot microcavities are crucial for optical sensing and lasing.
Developing cost-effective, high-performance polymer-based microcavities remains a challenge.

Purpose of the Study:

To design, fabricate, and optically characterize novel fully polymer-based Fabry-Pérot microcavities.
To evaluate their performance for both bulk refractive index sensing and laser applications.

Main Methods:

Fabrication of two types of polymer microcavities (Cavity A and B) using polymeric Distributed Bragg Reflector (DBR) films.
Optical characterization including quality factor (Q) measurement, refractive index sensing sensitivity, figure of merit (FOM), lasing threshold determination, and spectral analysis.

Keywords:

Fabry-Pérot optical microcavity optofluidic microlaser polymer photonics

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Main Results:

Cavity A demonstrated a high Q factor (≈ 2.15 × 10^5) and excellent refractive index sensing capabilities (FOM = 5.89 × 10^4, detection limit = 3.4 × 10^-7 RIU).
Cavity B exhibited efficient lasing action with a low threshold (1.83 μJ/mm^2) when doped with Rhodamine B dye.

Conclusions:

Fully polymer-based Fabry-Pérot microcavities offer high performance for sensing and lasing.
These cost-effective polymeric cavities hold significant potential for disposable photonic sensor platforms and integrated biolaser devices.