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| Keywords: Terahertz freq. metamaterial modulator.jpg en an array of gold structures on top of a semiconductor base The metamaterial and the semiconductor together form a device that can modulate the intensity of the T-rays by up to 50 percent when a voltage is applied to the gold structures The experimental demonstration of the device exceeds the performance of existing electrical terahertz modulators United States Department of Energy http //www lanl gov/news/1663/images/spot4lg jpg Los Alamos National Laboratory Hou-Tong Chen Los Alamos National Laboratory 2007-11-30 Public Domain a C-DOT-rays shine through the modulator b With no voltage applied electrons can flow across the gap in the gold structure The electrons absorb a few T-rays as they flow easily around the two loops c Applying voltage prevents electrons from crossing the gap But they absorb far more T-rays as they slosh back and forth between the upper and lower halves of the structure Fewer T-rays pass through the device PD-USGov Metamaterials Terahertz radiation | ||||
