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  • Leti Advance Enables More Efficient Optoelectronics
Oct 2010
GRENOBLE, France, Oct. 27, 2010 — CEA-Leti, a European research and development institute in the field of silicon photonics technology, announced that it has demonstrated the efficient integration of silicon photonic devices with fully complementary metal-oxide semiconductor (CMOS)-compatible plasmonic optical waveguides.

This new capability sets the stage for the fabrication of smaller, faster and more efficient optoelectronic interfaces, which could ultimately allow the development of significantly higher performing sensors, computer chips and other electronic components.

Waveguides, including optical fibers, are used to transmit signals and power in a variety of radio and optical communications uses. Leti’s new devices channel light through a narrow silicon waveguide placed in close proximity to a metal waveguide, causing the light to excite small, high-frequency electromagnetic waves, known as surface plasmons, in the metallic structures. The resulting devices can convert optical signals in the 1.5 µm communications band into plasmonic electron waves, and convert the plasmonic waves back into optical signals.

Leti’s pioneering combination of extremely small plasmonic-optical interfaces that connect to standard optical fibers provides high coupling efficiencies (up to 70 percent) over a wide spectral range. Unlike previous devices that have relied on metal waveguides made from gold, Leti’s metal waveguides are fabricated with copper, allowing them to be easily integrated into standard CMOS chip manufacturing processes.

“This demonstration of CMOS-compatible plasmonic-optical technology is a major milestone in the emerging field of metal-oxide-semiconductor photonics,” said Laurent Fulbert, photonics programs manager at Leti. “By concentrating light into very small modes, we can provide an efficient optical interface between the macroscopic world of optical fibers and the nanoscale world of transistors and molecular electronic devices.”

The plasmonic-optical devices were designed and fabricated by Leti, which collaborated with France’s Université de Technologie de Troyes (UTT) for additional near-field scanning optical microscope testing and characterization. The project results were presented earlier this month at the Group Four Photonics 2010 show in Beijing, and published in Nano Letters, a journal of the American Chemical Society.

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The use of atoms, molecules and molecular-scale structures to enhance existing technology and develop new materials and devices. The goal of this technology is to manipulate atomic and molecular particles to create devices that are thousands of times smaller and faster than those of the current microtechnologies.
optical communications
The transmission and reception of information by optical devices and sensors.
A sub-field of photonics that pertains to an electronic device that responds to optical power, emits or modifies optical radiation, or utilizes optical radiation for its internal operation. Any device that functions as an electrical-to-optical or optical-to-electrical transducer. Electro-optic often is used erroneously as a synonym.
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