Photonics

Topological Protection of Photonic Mid-Gap Defect Modes

  • By Burcu Ozden
  • 12 June 2018

Kevin Chen and his colleagues have demonstrated in a proof-of-concept experiment that they can contain light in such a way that makes it highly insensitive to defects that might be present in a material.

"From the perspective of photonic engineers, this is a wonderful learning opportunity to see the connections between lightwave engineering at length scale of micrometers, and quantum mechanics that typically deals with electron waves at length scale 10,000 times smaller," noted Kevin P. Chen.

Coherent Phonon Excitation Generates 100 THz Bandwidth Frequency Comb

  • By Anonymous (not verified)
  • 7 March 2012

PQI faculty Hrvoje Petek and his research team have generated a frequency comb with more than a 100 terahertz bandwidth as a means to process communications data at a remarkably rapid speed.

In a paper published in Nature Photonics, PQI faculty Hrvoje Petek, and his team detail their success in generating a frequency comb—dividing a single color of light into a series of evenly spaced spectral lines for a variety of uses—that spans a more than 100 terahertz bandwidth by exciting a coherent collective of atomic motions in a semiconductor silicon crystal.