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Channel Rhodopsins

Channel Rhodopsins

Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...

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Updated: Jun 20, 2026

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale

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Bio-inspired random lasers enabled by poplar catkin microstructures.

Jiatao Hu, Yuxia Zhao, Yining Zhang

|February 20, 2026

Summary

This summary is machine-generated.

Researchers developed a novel random laser using poplar catkin fibers (PCFs) as a biodegradable scattering medium. This green technology achieves low speckle contrast, enabling high-fidelity, speckle-free imaging for various applications.

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Last Updated: Jun 20, 2026

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Control of Cell Geometry through Infrared Laser Assisted Micropatterning

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Published on: July 10, 2021

Area of Science:

Photonics and Laser Technology
Materials Science
Biomaterials Engineering

Background:

Conventional lasers often suffer from speckle noise, hindering high-resolution imaging.
Developing cost-effective and environmentally friendly laser platforms is crucial for advanced optical applications.
Natural biomaterials offer potential as sustainable components in photonic devices.

Purpose of the Study:

To investigate the feasibility of using poplar catkin fibers (PCFs) as a scattering matrix for random lasers (RLs).
To optimize PCF concentration for enhanced lasing performance and reduced speckle.
To demonstrate the application of the developed RL for speckle-free imaging.

Main Methods:

Fabrication of solution-processed gain media incorporating Rhodamine 6G and varying concentrations of PCFs (1.5–5.5 mg/mL).
Characterization of lasing thresholds, emission spectra, and output stability under optical pumping.
Analysis of spatial coherence and speckle contrast, followed by speckle-free imaging tests using a USAF 1951 target and a dragonfly wing.

Main Results:

Optimal lasing threshold achieved at 4.5 mg/mL PCF concentration (8.21 µJ/pulse) due to hierarchical fibrous network scattering.
Significant spectral narrowing (14.8 nm to 0.8 nm) and redshift observed, indicating enhanced scattering strength.
Speckle contrast reduced to 0.0755, significantly lower than conventional lasers, enabling high-fidelity speckle-free imaging.

Conclusions:

Poplar catkin fibers serve as an effective, biodegradable scattering matrix for random lasers.
The developed PCF-based random laser offers a low-cost, green platform for speckle-free imaging.
Potential applications include bioimaging, environmental sensing, and flexible photonics.