Yvonne Carts-Powell

Freelance Writer

Yvonne Carts-Powell is a freelance writer living in Belmont, MA.

A 40 TW Ti:sapphire laser beam accelerates electrons in plasma within a capillary tube.

LASER PHYSICS: Lasers accelerate electrons in short order

Nov. 1, 2006
A breakthrough in using lasers to accelerate electrons, achieved by researchers at the Lawrence Berkeley National Laboratory (LBNL; Berkeley, CA) and Oxford University (Oxford...
A three-section graded photonic crystal first bends incoming light nearly parallel to the surface, then bends it back the other way for output. Bending depends not only on the angle of incidence and rate of change in the graded photonic crystal, but also on the wavelength.

PHOTONIC CRYSTALS: Light moves through tiny hoops at IPRA/Nano

June 1, 2006
Photonic crystals, silicon photonics, and surface plasmons were all discussed at the OSA topical meetings on Integrated Photonics Research and Applications (IPRA) and Nanophotonics...
FIGURE 1. Losses in an inorganic solar cell can be attributed to several factors. Photons below the semiconductor bandgap are not absorbed (1), extra energy from above-bandgap photons is lost as heat (2), junction and contact voltage losses occur (3 and 4), and recombination loss (5).

PHOTOVOLTAICS: Research targets more-efficient photovoltaics

June 1, 2006
Innovative research, including bandgap engineering and new approaches to organic photovoltaics, aims to create cheaper, more-efficient solar cells suitable for widespread use....