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Liquids analysis with optofluidic bragg microcavities.

Manuel Oliva-Ramirez¹, Lola González-García, Julian Parra-Barranco

¹Nanotechnology on Surfaces Laboratory, Instituto de Ciencia de Materiales de Sevilla, Avda. Américo Vespucio 49, E-41092 Sevilla, Spain.

ACS Applied Materials & Interfaces

|June 21, 2013

Summary

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Researchers created novel porous Bragg microcavities using glancing angle deposition. These photonic structures can detect liquid properties, offering potential for advanced optofluidic devices.

Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Porous nanocolumnar layers with alternating low (SiO2) and high (TiO2) refractive index materials are key for photonic structures.
Physical vapor deposition at glancing angles (GLAD) enables precise control over film properties and nanostructure orientation.

Purpose of the Study:

To manufacture highly porous, nondispersive, high optical quality microcavities.
To implement these photonic structures into responsive optofluidic devices for liquid characterization.

Main Methods:

Fabrication of porous Bragg microcavities using GLAD with controlled porosity, refractive index, and nanocolumn orientation.
Optical modeling to correlate spectral feature shifts with the refractive index of circulating liquids.

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Main Results:

Successfully manufactured high-quality porous Bragg microcavities.
Demonstrated quantitative correlation between optical spectral shifts (Bragg gap, resonant peak) and liquid refractive indices.
Validated the devices with glucose, NaCl solutions, and water-glycerol mixtures.

Conclusions:

Porous Bragg microcavities manufactured by GLAD are effective optofluidic devices.
These structures can accurately determine solution concentrations and liquid mixture proportions.
The developed materials show significant potential for sensing applications.