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We demonstrate a chaotic microcavity laser which not only produces unidirectional emission but also has a quality factor of 22000. The output beam has a divergence angle less than 40 degree for all lasing modes.
We demonstrated lasing in a microscopic cavity made of two nanoparticles in a homogeneous gain medium. The particles, either dielectric or metallic, acted as nano-mirrors. Such laser had well-defined lasing frequencies and produced directional output.
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