Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Georgia Tech develops technology for more compact, inexpensive spectrometers

09.02.2006


A prototype spectrometer made using Georgia Tech’s new technology. This spectrometer can be plugged into a lap top and used for environmental sensing.


New technology allows for more versatile portable spectrometers

Being the delicate optical instruments that they are, spectrometers are pretty picky about light.

But Georgia Tech researchers have developed a technology to help spectrometers — instruments that can be used as the main parts of sensors that can detect substances present in even ultra-small concentrations — analyze substances using fewer parts in a wider variety of environments, regardless of lighting. The technology can improve the portability while reducing the size, complexity, and cost of many sensing and diagnostics systems that use spectrometers. The technology has appeared in Applied Optics, Optics Express and Optics Letters and was presented as an invited talk at the IEEE Lasers and Electro-Optics Society Annual Meeting 2005.



Conventional spectrometers have multiple parts — a narrow slit, a lens (to guide light), a grating (to separate wavelengths), a second lens and a detector (to detect the power at different wavelengths). The Georgia Tech team’s goal was to combine all these pieces into two parts, a volume hologram (formed in an inexpensive piece of polymer) and a detector, to create a compact, efficient and inexpensive spectrometer that could be used for multiple spectroscopy and sensing applications.

“This technology is very useful for low-end spectrometers, but at the same time, there are many applications that require high-end spectrometers. This technology could convert a portion of a complex, high-end system into a much more versatile and light system,” said Ali Adibi, head of the project and an associate professor in the School of Electrical and Computer Engineering.

Because of its light weight and relative insensitivity to optical alignment, the new design helps create more versatile and portable spectrometers for several applications where portability had been difficult. For instance, the technology would make hand held devices possible for carbon monoxide detection or on-the-spot blood analysis and other biomedical applications.

One of the key advantages to the new spectrometer is its insensitivity to alignment. Spectrometers are very sensitive to the direction and wavelength of light and several of their parts are devoted to keeping the light correctly directed.

But the Georgia Tech team was able to incorporate those necessary alignments along with the focusing functions into a volume hologram. This hologram is recorded by the interference pattern of two beams in a piece of photopolymer.

“There were lots of challenges because the light we need to analyze is diffuse in nature,” Adibi said.

Conventional spectrometers work the best under collimated light (i.e. light moving in only one direction). However, the optical signal needed for practical sensing applications is diffuse. This problem is solved in conventional spectrometers by blocking light in all but one direction using a slit and a lens, but this also results in considerable power loss and lower efficiency.

“By choosing the appropriate hologram, we have no collimating hardware in our system. We have further demonstrated the capability of improving the throughput by using more complex holograms, which are recorded similar to less complex holograms, in our spectrometer without adding to the actual complexity of the system,” Adibi added.

The Georgia Tech team has a prototype for a lower-end spectrometer comparable to those currently on the market but for a considerably lower cost, Adibi said. Their research will now focus on developing more complex systems by using specially designed volume holograms to improve the efficiency — and thus the sensitivity — of the spectrometers, Adibi added.

The Georgia Institute of Technology is one of the nation’s premiere research universities. Ranked ninth among U.S. News & World Report’s top public universities, Georgia Tech educates more than 17,000 students every year through its Colleges of Architecture, Computing, Engineering, Liberal Arts, Management and Sciences. Tech maintains a diverse campus and is among the nation’s top producers of women and African-American engineers. The Institute offers research opportunities to both undergraduate and graduate students and is home to more than 100 interdisciplinary units plus the Georgia Tech Research Institute. During the 2004-2005 academic year, Georgia Tech reached $357 million in new research award funding. The Institute also maintains an international presence with campuses in France and Singapore and partnerships throughout the world.

Megan McRainey | EurekAlert!
Further information:
http://www.icpa.gatech.edu

More articles from Physics and Astronomy:

nachricht Tiny lasers from a gallery of whispers
20.09.2017 | American Institute of Physics

nachricht New quantum phenomena in graphene superlattices
19.09.2017 | Graphene Flagship

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

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

Im Focus: Tiny lasers from a gallery of whispers

New technique promises tunable laser devices

Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...

Im Focus: Ultrafast snapshots of relaxing electrons in solids

Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!

When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...

Im Focus: Quantum Sensors Decipher Magnetic Ordering in a New Semiconducting Material

For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.

Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...

Im Focus: Fast, convenient & standardized: New lab innovation for automated tissue engineering & drug

MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems Holding GmbH about commercial use of a multi-well tissue plate for automated and reliable tissue engineering & drug testing.

MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems...

Im Focus: Silencing bacteria

HZI researchers pave the way for new agents that render hospital pathogens mute

Pathogenic bacteria are becoming resistant to common antibiotics to an ever increasing degree. One of the most difficult germs is Pseudomonas aeruginosa, a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

“Lasers in Composites Symposium” in Aachen – from Science to Application

19.09.2017 | Event News

I-ESA 2018 – Call for Papers

12.09.2017 | Event News

EMBO at Basel Life, a new conference on current and emerging life science research

06.09.2017 | Event News

 
Latest News

Molecular Force Sensors

20.09.2017 | Life Sciences

Producing electricity during flight

20.09.2017 | Power and Electrical Engineering

Tiny lasers from a gallery of whispers

20.09.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>