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biophotonics Features
Nanoantennae Show Promise for Subwavelength Optical Microscopy
Researchers have fabricated optical nanoantennae on the end face of a near-field probe. Using single fluorescent molecules, they measured the antennae’s resonance, excitation conditions and field localization, showing that the constructs are similar...
Photonics Spectra, February 2007
Turning the Windshield into a Display
A major problem with ever-more-sophisticated automobiles is the growing amount of information provided to drivers. Increased information in dashboard displays diverts eyes from the road, creating a distraction that can lead to accidents. Head-up...
Photonics Spectra, February 2007
Zinc Phosphide Nanowires for Photon Detection
Although not dirt, zinc phosphide is cheap and abundant. Carefully synthesized structures of the material also have good optical efficiency and resist the buildup of an oxide layer on their surface. Together, these properties give the substance...
Photonics Spectra, February 2007
Cavity-Enhanced Absorption Spectroscopy
Detects Geothermal Gases
Gas phase chromatography and mass spectrometry often are used to analyze volcanic emissions because of their ability to detect low levels of trace gases. However, these techniques are limited by their instrumental complexity and inability to...
Photonics Spectra, January 2007
Intrazeolite PbS Quantum Dots with Nonlinear Properties Observed
At Sogang University in Seoul, South Korea, scientists have successfully incorporated lead sulfide quantum dots into zeolite-Y films and found high levels of third-order nonlinear optical activity. The material could be used for optical switches,...
Photonics Spectra, January 2007
Method Positions and Deposits ZnO Nanowires
Scientists at the University of Wisconsin-Milwaukee have employed electric fields to align single crystalline ZnO nanowires with support electrodes and electrostatic forces to bind them in place. In a demonstration of the potential utility of their...
Photonics Spectra, December 2006
Nanoparticle-Loaded Thermosensitive Microgel Changes Color
A hybrid material whose optical properties change color with temperature may find a place in biomedical applications such as drug delivery. Developed by Haruma Kawaguchi and Daisuke Suzuki of Keio University in Yokohama, Japan, the material...
Photonics Spectra, May 2006
Commercial Applications of Optoelectronics
Optoelectronics is at the crossroads of electronics and optics. Using optical and electronic means, it generates, manipulates and converts light. Photonic devices process, store, transmit and display information for applications such as...
Photonics Spectra, February 2006
Femtosecond Lasers Carve out a Niche in Micromachining
The drive for miniaturization in electronics, photonics and biomedical devices is spurring an ever-growing need for laser micromachining. Femtosecond laser pulses provide unique capabilities for producing features as small as a few tens of...
Photonics Spectra, June 2004
Fluorescence Detection Gains in Sensitivity
The biotechnology and medical diagnostics industries could soon benefit from a technique that promises enhanced sensitivity over conventional fluorescence detection methods. Developed at the University of Maryland in Baltimore and called directional...
Photonics Spectra, February 2004
Digital Imaging from the Inside Out
Companies that develop systems for medical imaging are motivated not only by the demand by hospitals for faster results at lower cost, but also by new imaging technologies. Radiology, like many branches of medical imaging, is going digital, and it’s...
Photonics Spectra, January 2004
Will Photonics Find Its Place in Medicine?
New medical applications for lasers and imaging seem to be around every corner, but this does not mean that doctors will invest in new systems. To incorporate lasers into their practices, doctors must find that they are both useful and...
Photonics Spectra, May 2001
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