Tiny metal resonators can be used to create a material with tunable responses to an applied voltage. Combined with a semiconductor substrate, they can be used to control technologically promising terahertz radiation.
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Cross-polarization coupling terahertz time-domain spectroscopy in a semiconductor based on the Hall effect
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Daniel, M. A terahertz modulator. Nature 444, 560–561 (2006). https://doi.org/10.1038/444560a
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DOI: https://doi.org/10.1038/444560a
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