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Updated: Sep 17, 2025

$Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing$

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing

Published on: April 25, 2019

Ultrathin Deployable Femtosecond Vortex Laser.

Zhiyang Xu¹, Yu Liu¹, Siqi Chang¹

¹School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, 100124, China.

Advanced Materials (Deerfield Beach, Fla.)

|June 30, 2025

Summary

This summary is machine-generated.

Researchers developed a deployable femtosecond vortex laser using a thin polymer membrane and photonic crystal. This breakthrough enables low-threshold, ultrafast vortex pulse generation for advanced optical applications.

Keywords:

bound states in the continuum conjugated polymer femtosecond pulse photonic crystal vortex laser

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Last Updated: Sep 17, 2025

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Published on: November 22, 2019

Area of Science:

Photonics
Materials Science
Laser Physics

Background:

Ultrafast vortex lasers offer potential for optical communications and imaging.
Direct generation of femtosecond vortex pulses in micro/nanoscale lasers is challenging.

Purpose of the Study:

To demonstrate an ultrathin, deployable femtosecond vortex laser.
To overcome limitations in micro/nanoscale vortex laser fabrication.

Main Methods:

Utilized a ≈200 nm-thick conjugated polymer gain membrane.
Integrated the membrane with a square-lattice photonic crystal supporting bound states in the continuum.
Leveraged Purcell enhancement for high-Q vortex modes.

Main Results:

Achieved low-threshold (1.5 µJ/cm²) femtosecond (≈600 fs) vortex pulse emission.
Demonstrated peak power of several MW/cm².
Showcased modular deployment onto arbitrary substrates and unidirectional emission when placed on a mirror, doubling efficiency.

Conclusions:

The ultrathin laser provides a novel solution for generating femtosecond vortex pulses.
Its deployable nature simplifies integration into complex optical systems.
Potential applications include simplified super-resolution imaging and lithography.