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    Area of Science:

    • Optics and Photonics
    • Terahertz Science
    • Materials Science

    Background:

    • Photonic crystal lasers typically utilize pillar structures larger than the emission wavelength.
    • Active photonic metamaterials offer new avenues for laser design and miniaturization.

    Purpose of the Study:

    • To investigate the lasing properties of micropillar-based terahertz lasers with subwavelength active pillars.
    • To explore the potential of scaled-down band-edge photonic crystal lasers as active photonic metamaterials.

    Main Methods:

    • Fabrication of micropillar array lasers with pillar diameters significantly smaller than the terahertz emission wavelength.
    • Measurement of stimulated emission spectra to identify lasing frequencies and regimes.

    Main Results:

    • Demonstrated stimulated emission at 4 THz from micropillar array lasers with 5 µm pillar diameters.
    • Observed lasing emission in the effective medium regime, deviating from high-symmetry points typical of larger photonic crystal lasers.
    • Confirmed the integration of active subwavelength optics within the terahertz laser architecture.

    Conclusions:

    • Micropillar array lasers with subwavelength active pillars represent a viable approach to terahertz laser development.
    • These findings are crucial for advancing the realization of compact and efficient nanowire-based terahertz lasers.
    • The study highlights the importance of the effective medium regime in the design of miniaturized photonic lasers.