Phil Saunders/ spacechannel.org
With digital holographic microscopy,
scientists can directly
record data about an
and thus numerically
reconstruct images of
at different depths.
[ COVER STORY ]
18 Cell Identification with Computational 3-D Holographic Microscopy
Recent developments in 3-D computational optical imaging have ushered in a
new era for biological research. Techniques in 3-D holographic microscopy are
enabling researchers to obtain rich, quantitative information about the structure
of cells and microorganisms in dynamic, real-time conditions.
Inkyu Moon, Mehdi Daneshpanah, Arun Anand and Bahram Javidi
24 RAPID Lithography: New Photoresists Achieve Nanoscale Resolution
Over the past decade, researchers have shattered the traditional view of the
diffraction limit. Using new techniques, they have obtained resolution far smaller
than the wavelength of light excitation or emission. Similar concepts are now
being applied to photolithography, making it possible to create nanoscale
features in a photoresist using visible or near-infrared light.
John T. Fourkas
COVER: Artist’s interpretation
of cell identification with
computational 3-D holographic
microscopy. Illustration by Phil
30 Heinrich Hertz and the Foundations of Electromagnetism
Heinrich Rudolf Hertz did not grasp the practical importance of his work during
his lifetime, but his research into electromagnetic radiation laid the foundation for
all wireless communications. The education and experience of this 19th century
German scientist prepared him to make his monumental discoveries on propagating electromagnetic waves.
Barry R. Masters
June 2011 | 1