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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

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A hybrid OTFT-SPR system for simultaneous electronic and optical sensing.

Davood Hatami^1,2, Roger Hasler³, Andrea Spanu¹

¹University School for Advanced Studies (IUSS), Piazza della Vittoria 15, Pavia, 27100, Italy.

Scientific Reports

|April 30, 2025

Summary

This study introduces a novel flexible sensor combining organic thin-film transistors and surface plasmon resonance for advanced multivariable detection. The new design offers improved reliability and cost-effectiveness for next-generation sensing platforms.

Keywords:

Extended Gate-OFET Organic electronic sensors and biosensors SPR Simultaneous electronic and optical detection

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Area of Science:

Materials Science
Nanotechnology
Sensor Technology

Background:

Existing Surface Plasmon Resonance (SPR) and Field-Effect Transistor (FET) systems face limitations in reliability and integration.
Combined SPR/FET devices require improvements for enhanced performance and broader applicability.

Purpose of the Study:

To develop an advanced multivariable sensing platform integrating a flexible extended-gate organic thin-film transistor (ExG-OTFT) with SPR readout.
To overcome limitations of previous combined systems through spatial separation and a pseudo-reference electrode for improved reliability.
To demonstrate simultaneous electrical and optical detection for real-time monitoring of surface processes.

Main Methods:

Fabrication of a flexible ExG-OTFT device compatible with SPR instrumentation.
Spatial separation of the sensing surface from the transistor body.
Implementation of a pseudo-reference electrode for enhanced system stability.
Real-time monitoring of polyelectrolyte multilayer formation using simultaneous electrical and optical detection.

Main Results:

Demonstrated simultaneous electrical and optical detection capabilities.
Achieved improved system reliability via spatial separation and pseudo-reference electrode.
Showcased the sensor's sensitivity to mass uptake (SPR) and charge carrier distribution (electronic).
Validated the ExG-OTFT architecture's compatibility with commercial SPR instruments.

Conclusions:

The developed flexible SPR/FET sensor offers a scalable, robust, and cost-effective solution for multivariable sensing.
This technology enables straightforward upgrades to existing SPR instrumentation for enhanced functionality.
The platform holds significant potential for advancing next-generation sensing applications across diverse fields.