AI Article Synopsis
- Perovskite nanocrystals (PNCs) hold potential for compact lasers, but controlling their emission direction has been challenging, limiting their application in photonic devices.
- The researchers developed PNC metasurface lasers that can emit four polarized beams at a specific angle (∼30°) using a soft nanoimprinting technique and by designing photonic modes at the X point of the reciprocal lattice.
- The laser's design allows for tunable emission angles by changing the thickness of the PNCs, making it suitable for use in directional optical antennas, 3D laser displays, and visible light communication.
Article Abstract
Perovskite nanocrystals (PNCs) are attractive emissive materials for developing compact lasers. However, manipulation of PNC laser directionality has been difficult, which limits their usage in photonic devices that require on-demand tunability. Here we demonstrate PNC metasurface lasers with engineered emission angles. We fabricated millimeter-scale CsPbBr PNC metasurfaces using an all-solution-processing technique based on soft nanoimprinting lithography. By designing band-edge photonic modes at the high-symmetry X point of the reciprocal lattice, we achieved four linearly polarized lasing beams along a polar angle of ∼30° under optical pumping. The device architecture further allows tuning of the lasing emission angles to 0° and ∼50°, respectively, by adjusting the PNC thickness to shift other high-symmetry points (Γ and M) to the PNC emission wavelength range. Our laser design strategies offer prospects for applications in directional optical antennas and detectors, 3D laser projection displays, and multichannel visible light communication.
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| http://dx.doi.org/10.1021/acs.nanolett.4c03921 | DOI Listing |
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