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THz Semiconductor Laser Revealed

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CAMBRIDGE, Mass. & LEEDS, England, Aug. 10, 2010 — Applications in terahertz science and technology may be getting a boost thanks to a new terahertz (THz) semiconductor laser that emits beams with a much smaller divergence than conventional THz laser sources. The metamaterial patterns are directly sculpted on the highly doped GaAs facet of the device. Artificial coloring in the figure indicates deep and shallow micron scale grooves, which have different functions. The shallow "blue" grooves efficiently couple laser output into surface electromagnetic waves on the facet and confine the waves to the facet. (Images: Courtesy of the...Read full article

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