Modulating dispersion properties of low index photonic crystal structures using microfluidics

Area of Science:

• Photonics and Materials Science
• Optics and Light Manipulation

Background:

• Low-index periodic structures offer unique optical properties but often lack tunability.
• Controlling light propagation in photonic crystals is crucial for advanced optical devices.

Purpose of the Study:

• To present a novel technique for dynamically manipulating the dispersive properties of low-index periodic structures.
• To design and characterize an adaptive photonic crystal lens with tunable optical properties.

Main Methods:

• Utilizing microfluidic materials to fill periodic lattices with fluids of varying refractive indices.
• Employing Equi-frequency contours (EFC) to quantify optical property modulation.
• Introducing defects by selective lattice site filling to measure refractive index changes.

Main Results:

• Demonstrated successful modulation of refractive index and refractive angle via microfluidic fluid changes.
• Designed and optically characterized an adaptive low-index photonic crystal lens with tunable focusing capabilities.
• Presented experimental results of a silicon-based photonic crystal (PhC) lens acting as an optical coupling element.

Conclusions:

• Microfluidic integration provides an effective method for achieving tunable optical properties in low-index photonic crystals.
• The developed adaptive lens shows promise for applications requiring dynamic light control and optical coupling.