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Related Experiment Video

Updated: Jun 24, 2026

Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents

Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents

Published on: May 1, 2012

Surface-plasmon resonance sensor using silica-core Bragg fiber.

Lin Ma¹, Takashi Katagiri, Yuji Matsuura

¹Department of Electrical and Communications Engineering, Tohoku University, Sendai, Japan. malin@ecei.tohoku.ac.jp

|April 3, 2009

Summary

A novel silica-core Bragg fiber sensor offers flexible refractive index measurement for aqueous samples. Reduced core size enhances sensitivity, making it ideal for chemical and biosensing applications.

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Last Updated: Jun 24, 2026

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Published on: November 17, 2023

Area of Science:

Photonics
Nanotechnology
Sensing Technology

Background:

Surface-plasmon resonance (SPR) sensors are crucial for detecting changes in refractive index.
Bragg fibers offer unique optical properties and design flexibility for sensor development.

Purpose of the Study:

To develop a flexible silica-core Bragg fiber SPR sensor for precise refractive index measurements.
To enable low refractive index measurements for biosensing and chemical sensing in aqueous environments.

Main Methods:

Fabrication of a silica-core Bragg fiber using radio-frequency (rf) sputtering.
Excitation of the surface plasmonic wave using an HE11-like Bragg fiber core mode.
Measurement of refractive index by analyzing SPR-induced extinction.

Main Results:

Demonstrated high design flexibility in the Bragg fiber geometry.
Achieved significant reduction in measurable refractive index by decreasing core size.
Observed SPR-induced extinction exceeding 20 dB, confirming sensor performance.

Conclusions:

The developed Bragg fiber SPR sensor is suitable for low refractive index measurements in aqueous solutions.
The sensor's design flexibility and sensitivity make it promising for advanced biosensing and chemical sensing.
The rf-sputtering fabrication method provides a viable route for creating these advanced optical sensors.