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Related Experiment Video

Updated: Jun 18, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

High-refractive-index 2D photonic structures for robust low-threshold multiband lasing.

Ana Conde-Rubio¹, Juan R Deop-Ruano², Luis Cerdán²

¹Institute of Materials Science of Barcelona (ICMAB-CSIC), Campus de la UAB, 08193, Bellaterra, Spain. amihi@icmab.es.

Nanoscale Horizons

|January 28, 2025

Summary

This summary is machine-generated.

High-refractive-index (HRI) dielectrics enable compact lasers by supporting electric and magnetic modes. This study demonstrates HRI structures with TiO2 coatings achieve low-threshold, multiband lasing through optimized optical resonances and polarization control.

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Area of Science:

Nanophotonics
Materials Science
Laser Physics

Background:

High-refractive-index (HRI) dielectrics are crucial for compact laser development.
HRI dielectrics offer versatility over plasmonic platforms by supporting both electric and magnetic modes.
Reduced absorption loss in HRI materials minimizes heat generation, enhancing laser performance.

Purpose of the Study:

To investigate the lasing properties of 2D periodic square hole arrays in HRI dielectric-coated polymeric films.
To explore the impact of lattice parameters and hole distribution on laser performance.
To understand how material anisotropy influences optical modes and lasing characteristics.

Main Methods:

Fabrication of 2D periodic square hole arrays in SU-8 using scalable soft nanoimprinting lithography.
Coating of the arrays with a high-refractive-index dielectric layer (TiO2).
Deposition of an organic dye-doped SU-8 layer for lasing.

Main Results:

Achieved low-threshold lasing from the HRI dielectric structures.
Identified optimal laser performance when optical resonances align with dye emission wavelengths.
Observed emergence of new modes and multiple lasing peaks due to TiO2 coating anisotropy, breaking polarization degeneracy.

Conclusions:

Simple-to-fabricate HRI structures exhibit complex optical responses.
Demonstrated multiband lasing capabilities in these HRI platforms.
Showcased an innovative approach for robust HRI laser development with tunable emission properties.