Phased-Array Antennas for Light

Nano-optical array promises electronically steered light beams

3 min read
An array of waveguides and silicon photonic structures
Image: Jie Sun


Images: Jie Sun
Antennas Everywhere: An array of waveguides and silicon photonic structures can manipulate the phase of light in order to steer a beam. Click to enlarge.

9 January 2013—An array of nanometer-scale optical antennas built on a silicon chip holds the promise of holographic televisions and cheaper automobile crash-avoidance systems, its creators say.

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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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