We demonstrated a monolithic GaN-InGaN core-shell nanorod lattice lasing under room temperature. The threshold pumping density was as low as 140 kW/cm with a quality factor as high as 1940. The narrow mode spacing between lasing peaks suggested a strong coupling between adjacent whisper gallery modes (WGM), which was confirmed with the far-field patterns. Excitation area dependent photoluminescence revealed that the long-wavelength lasing modes dominated the collective lasing behavior under a large excitation area. The excitation-area-dependent lasing behavior resulted from the prominent optical coupling among rods. According to the optical mode simulations and truncated-rod experiments, we confirmed that the fine-splitting of lasing peaks originated from the coupled supermodes existing in the periodic nanorod lattices. With wavelength-tunable active materials and a wafer-level scalable processing, patterning optically coupled GaN-InGaN core-shell nanorods is a highly practical approach for building various on-chip optical components including emitters and coupled resonator waveguides in visible and ultraviolet spectral range.
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Article Synopsis
- - This study presents a novel technique for generating dual-mode vortex lasing with a topological charge of -2 using specially designed photonic crystals that support certain bound states.
- - The researchers created a hexagonal pattern of TiO nanoparticles in a crystal slab to achieve these bound states at a specific point (the Γ point), while adjusting the shape of the crystal led to lasing occurring at off-Γ points, producing two closely spaced laser peaks.
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