FEATURES | CONTENTS
OPN June 2009
Vol. 20, No. 6
[ COVER STORY ]
18 Green Silicon Photonics
Silicon photonics has shown great promise in overcoming communications bottlenecks and providing
low-cost components for the Internet—but can it help “green” the industry as well? Harvesting the
optical energy lost to two-photon absorption in silicon devices may pave the way toward reduced
optical losses and the simultaneous generation of electrical power.
Bahram Jalali, Sasan Fathpour and Kevin Tsia
24 Photonic Crystal LEDs
LEDs that have photonic crystals etched on them can direct the emission of light at preferred angles and
enhance brightness without consuming more power. These devices have the potential to revolutionize
the lighting industry—and spur widespread adoption of environmentally friendly lighting solutions.
30 Lidar in Space: From Apollo to the 21st Century
Over the last four decades, spaceborne lidar instruments have evolved beyond their original
application—altimetry—to tracking glacier melting, gauging wind speeds and spotting snow on Mars.
36 Lord Rayleigh: A Scientific Life
John William Strutt, also known as Lord Rayleigh, is well recognized as a pioneer in light scattering
and other areas of optics. But he was also a master of iterative mathematical techniques for solving
complex physical problems.
Barry R. Masters
Integrated photonics may have a
profound effect on the telecom
industry, the economy and
the health of the planet.
COVER: Illustration by
This page: Getty Images