Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Photonics: Better connected

17.02.2012
A novel link between optical fibers and nanometer-scale silicon structures could aid the development of integrated optical circuits
Silicon is a unique material that has revolutionized electronics; it enables engineers to put millions of electrical devices onto a single chip. Replacing the electrical currents in this technology with beams of light could enable even faster information processing. Qian Wang at the A*STAR Data Storage Institute and co-workers1 have now designed a crucial component for such optical chips — a connector that links the silicon chip to an optical fiber. Such a device should enable efficient light input and output.

Silicon is a promising platform for dense photonic integration because sub-micrometer-sized silicon wires, known as waveguides, are capable of tightly confining and guiding light. As the technology required for processing silicon in this way already exists, silicon nanowires are attracting attention from the electronics industry. The challenge, however, is to be able to insert and extract a beam of light efficiently into and out of such tiny structures.

Wang and his team have now designed an ultra-compact lens that can be directly integrated into the silicon chip at the end of the waveguide. Their proposed lens is based on an idea known as a graded refractive index (GRIN) lens. The common GRIN lens usually distorts a light beam as it is collimated or focused, resulting in a so-called aberration. “We now propose a computational algorithm that can generate a novel graded refractive index profile for the GRIN lens and thus achieve aberration-free sub-wavelength focusing and highly efficient coupling,” says Wang.

The team of researchers’ graded index structure consists of a stack of alternating layers of two materials — for example, using silicon, which has a high refractive index, and silicon dioxide, which has a low refractive index. The layers of silicon are thicker than those of silicon dioxide at the optical axis, but this gradually reverses higher up in the stack.

Simulations showed how this structure could expand out light travelling along a 300 nanometer-thick silicon waveguide so that it couples to a fiber with a diameter of 10.4 micrometers. With appropriate anti-reflection coating, the coupling efficiency was calculated to be as high as 90%. The team of researchers also assessed the sensitivity of the optical coupling to any movement of the fiber, indicating that the new approach would provide a compact, efficient and robust way of achieving fiber-to-nanophotonic chip coupling. The next step will be to demonstrate this concept experimentally. “We plan to incorporate the idea into an electronic–photonic integration platform,” says Wang.

The A*STAR-affiliated researchers contributing to this research are from the Data Storage Institute

Lee Swee Heng | Research asia research news
Further information:
http://www.research.a-star.edu.sg
http://www.researchsea.com

More articles from Power and Electrical Engineering:

nachricht Six-legged robots faster than nature-inspired gait
17.02.2017 | Ecole Polytechnique Fédérale de Lausanne

nachricht Did you know that IR heat plays a central role in the production of chocolates?
14.02.2017 | Heraeus Noblelight GmbH

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Biocompatible 3-D tracking system has potential to improve robot-assisted surgery

17.02.2017 | Medical Engineering

Real-time MRI analysis powered by supercomputers

17.02.2017 | Medical Engineering

Antibiotic effective against drug-resistant bacteria in pediatric skin infections

17.02.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>