Metamaterials Could Slim Down Millimeter-Wave Imagers

Simpler scanners with no moving parts could lead to portable weapons detectors

3 min read
Photo: John Hunt, Duke ECE


Photo: John Hunt, Duke ECE
Sensing Strip: A metamaterial-enabled waveguide steers beams of microwaves. Click on the image to enlarge.

17 January 2013—Millimeter-wave scanners are able to reveal hidden guns and knives on a person’s body because that wavelength of light passes through clothing but bounces off metal. But these scanners are expensive, bulky, and, as anyone who has stood in an airport line knows, slow.

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The Transistor at 75

The past, present, and future of the modern world’s most important invention

1 min read
A photo of a birthday cake with 75 written on it.
Lisa Sheehan

Seventy-five years is a long time. It’s so long that most of us don’t remember a time before the transistor, and long enough for many engineers to have devoted entire careers to its use and development. In honor of this most important of technological achievements, this issue’s package of articles explores the transistor’s historical journey and potential future.

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