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Continuous-Wave Pumped Monolayer WS2 Lasing for Photonic Barcoding.
Haodong Cheng1,2,3, Junyu Qu1,2, Wangqi Mao3
1Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials Science and Engineering, Hunan University, Changsha 410082, China.
Nanomaterials (Basel, Switzerland)
|April 12, 2024
Summary
Researchers developed high-capacity photonic barcodes using continuous-wave pumped tungsten disulfide (WS2) microlasers. This innovation enhances information security and anti-counterfeiting with simplified detection and massive encoding potential.
Area of Science:
- Photonics and Materials Science
- Nanotechnology and Optoelectronics
Background:
- Micro/nano photonic barcodes offer high security but face limitations in encoding capacity and detection.
- Conventional methods often require expensive pulsed lasers and suffer from broad emission bandwidths.
Purpose of the Study:
- To develop high-capacity photonic barcode labels for enhanced information security and anti-counterfeiting.
- To overcome the limitations of conventional photonic barcodes through novel material and laser design.
Main Methods:
- Grew large-area, high-quality monolayer tungsten disulfide (WS2) films using vapor deposition.
- Constructed optically pumped microlasers by coupling WS2 films with external cavities.
- Utilized closely packed WS2 microlasers of varying sizes for high-density barcode pixelation.
Main Results:
- Achieved continuous-wave (CW) pumped lasing with a narrow linewidth (~0.39 nm) and low threshold (~400 W cm-2) at room temperature.
- Demonstrated high-density, nonuniform multiple-mode lasing signals from WS2 microlasers.
- A 20-pixel label achieved a high encoding capacity of 2.35 × 10^108.
Conclusions:
- Continuous-wave operation and narrow-linewidth lasing simplify detection for photonic barcodes.
- This work advances two-dimensional material micro/nanolasers for information encoding and security.
- The proposed WS2-based photonic barcodes offer a promising platform for robust anti-counterfeiting solutions.
