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Femtosecond laser melting upconversion nanoparticles for sub-micrometer optical patterning.

Weizhao Gu, Simone Lamon, Min Gu

|April 12, 2025

Summary

Researchers precisely control upconversion luminescence (UCL) in nanoparticle (UCNP) thin films using laser-induced melting. This method achieves high-resolution optical patterning with over 90% efficiency.

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Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Upconversion luminescence (UCL) in nanoparticle (UCNP) thin films is crucial for optical applications.
Precise control over UCL is needed for advanced applications like high-resolution patterning.
Existing methods often require complex materials or multi-stimulus systems.

Purpose of the Study:

To introduce a novel method for precise modulation of UCL in UCNP thin films.
To demonstrate high-resolution, sub-micrometer optical patterning using laser-induced melting.
To investigate the intrinsic properties of UCNPs for UCL modulation.

Main Methods:

Employing a 460-nm femtosecond (fs) laser for localized melting of UCNP thin films.
Disrupting the UCNP crystalline lattice through laser-induced melting.
Utilizing the intrinsic properties of UCNPs for tunable UCL quenching.

Main Results:

Achieved precise modulation of UCL with efficiencies exceeding 90%.
Demonstrated high-resolution, sub-micrometer optical patterning capabilities.
Confirmed the method relies solely on intrinsic UCNP properties, avoiding complex additives.

Conclusions:

Laser-induced melting offers a precise and efficient method for UCL modulation in UCNP thin films.
The technique enables sub-micrometer optical patterning without composite materials.
This intrinsic UCNP modulation is suitable for advanced optical device fabrication.