Feature Articles

Organic Photovoltaics

Satisfying the world’s growing demand for energy is an urgent societal challenge. Organic photovoltaics holds promise as a cost-efficient and environmentally friendly solution.

by Bernard Kippelen
Optical Lithography in the Extreme UV

As the number of transistors on a chip continues to increase, the industry’s shrinking feature size is outstripping even the best efforts of optical engineers. Extreme ultraviolet lithography can lead to a more-than-tenfold decrease in wavelength, translating to a startling leap in performance.

by Stephen P. Renwick, David Williamson, Kazuaki Suzuki and Katsuhiko Murakami
Using Lidar to Measure the Ozone Layer

South American scientists are using lidar technology to measure stratospheric ozone, water vapor and aerosols in Argentine Patagonia. Their work is helping to monitor global climate change, and has led to the development of a method for alerting local populations to the presence of the ozone hole.

by Eduardo Quel, Elian Wolfram, Lidia Otero, Jacobo Salvador, Juan Pallotta, Raúl D´Elía and Marcelo Raponi

Departments and Columns

Polymer Opal Films Could Have Colorful Applications

Colorful applications for polymer opal films; lasers sort crops from weeds; portable sky-brightness meters.

Lasers Sort Crops from Weeds

An Australian research group is developing a laser-driven sensor and spraying system that can distinguish the good plants from the undesirables.

Did You Know?

Portable sky-brightness meters from the National Optical Astronomy Observatory.

Optics Innovations
Technology Transfer at the University of Central Florida

UCF is home to two optics-based research centers. Both enjoy robust government and industrial funding, and have faculty with significant industry experience and an entrepreneurial spirit.

Optical Engineering
Surface Finishing of Complex Optics

Advanced optical designs require shapes and materials that are challenging to finish. As designs become more intricate, new fabrication tools are needed. We discuss advanced surface-finishing methods, particularly methods that rely on the magnetorheological finishing process, a stable polishing technology that enables precision fabrication of flats and spheres as well as increasingly complex optics, such as aspheres and freeform shapes.

Light Touch
Playing With Light

A history of Games that incorporate the photon.

Global Optics
Arab Origins of the Discovery of the Refraction of Light

You’ve heard of DaVinci, Descartes and Newton, but what about Ibn Sahl and Ibn al-Haytham? These Arab scientists were describing the fundamental properties of light centuries before their European counterparts.

The History of OSA
Reminiscences: From the Files of {Arthur Hardy}

Arthur Hardy pioneered the rapid automatic recording of absorption spectra. He was widely recognized for his invention of a recording spectrophotometer to measure refl ected and transmitted light.


Also in this Issue

President's Message
President's Message

After Image
And the Winners Are...

Results for OPN's 2007 After Image Photo Contest

OSA Today
OSA Today

Book Reviews
Book Reviews

In Memory
Gallieno Denardo, 1935-2007

Remembering Gallieno Denardo, coordinator of the optics and laser programs at ICTP.