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Photon's eye view
Emily Grace (graduate student), Christine Pappas (graduate student), Benjamin Schmitt (University of Pennsylvania), Laura Newburgh (postdoc)
Department of Physics
The Universe exploded into being 14 billion years ago and remnant light from this explosion is still visible today. Our group measures this light at a site 17,000 feet high in the Atacama Desert in Chile. We use special "detectors" developed in a collaboration between Princeton and other institutions. These detectors use antennas to capture the non-visible wavelengths of light focused by our 6 meter telescope.

This photograph looks down into feedhorns, small corrugated structures that allow particles of light to funnel toward the antennas. The antennas are tiny dark triangles suspended upon a thin membrane on a silicon detector wafer that attaches to the base of each feedhorn. The membrane is thin enough that you can see the gold-plated reflective wafer behind the antennas. Light from the camera is reflecting off the gold-plated wafer, casting a golden gleam.