Navigation Links
NIST's 'nanotubes on a chip' may simplify optical power measurements

The National Institute of Standards and Technology (NIST) has demonstrated a novel chip-scale instrument made of carbon nanotubes that may simplify absolute measurements of laser power, especially the light signals transmitted by optical fibers in telecommunications networks.

The prototype device, a miniature version of an instrument called a cryogenic radiometer, is a silicon chip topped with circular mats of carbon nanotubes standing on end.* The mini-radiometer builds on NIST's previous work using nanotubes, the world's darkest known substance, to make an ultraefficient, highly accurate optical power detector,** and advances NIST's ability to measure laser power delivered through fiber for calibration customers.***

"This is our play for leadership in laser power measurements," project leader John Lehman says. "This is arguably the coolest thing we've done with carbon nanotubes. They're not just black, but they also have the temperature properties needed to make components like electrical heaters truly multifunctional."

NIST and other national metrology institutes around the world measure laser power by tracing it to fundamental electrical units. Radiometers absorb energy from light and convert it to heat. Then the electrical power needed to cause the same temperature increase is measured. NIST researchers found that the mini-radiometer accurately measures both laser power (brought to it by an optical fiber) and the equivalent electrical power within the limitations of the imperfect experimental setup. The tests were performed at a temperature of 3.9 K, using light at the telecom wavelength of 1550 nanometers.

The tiny circular forests of tall, thin nanotubes called VANTAs ("vertically aligned nanotube arrays") have several desirable properties. Most importantly, they uniformly absorb light over a broad range of wavelengths and their electrical resistance depends on temperature. The versatile nanotubes perform three different functions in the radiometer. One VANTA mat serves as both a light absorber and an electrical heater, and a second VANTA mat serves as a thermistor (a component whose electrical resistance varies with temperature). The VANTA mats are grown on the micro-machined silicon chip, an instrument design that is easy to modify and duplicate. In this application, the individual nanotubes are about 10 nanometers in diameter and 150 micrometers long.

By contrast, ordinary cryogenic radiometers use more types of materials and are more difficult to make. They are typically hand assembled using a cavity painted with carbon as the light absorber, an electrical wire as the heater, and a semiconductor as the thermistor. Furthermore, these instruments need to be modeled and characterized extensively to adjust their sensitivity, whereas the equivalent capability in NIST's mini-radiometer is easily patterned in the silicon.

NIST plans to apply for a patent on the chip-scale radiometer. Simple changes such as improved temperature stability are expected to greatly improve device performance. Future research may also address extending the laser power range into the far infrared, and integration of the radiometer into a potential multipurpose "NIST on a chip" device.

Contact: Laura Ost
National Institute of Standards and Technology (NIST)

Related biology technology :

1. Karyopharm Therapeutics Announces Oral Presentation at the American College of Rheumatology (ACR) on the use of Selective Inhibitors of Nuclear Export (SINE) CRM1 Antagonists in preclinical models of Systemic Lupus Erythematosus (SLE)
2. New biosensor benefits from melding of carbon nanotubes, DNA
3. Scientists solve mystery of colorful armchair nanotubes
4. Perfect nanotubes shine brightest
5. Carbon nanotubes can double growth of cell cultures important in industry
6. Sensing the infrared: Researchers improve IR detectors with single-walled carbon nanotubes
7. Unzipped carbon nanotubes could help energize fuel cells and batteries, Stanford scientists say
8. Stanford engineers perfecting carbon nanotubes for highly energy-efficient computing
9. Strengthening fragile forests of carbon nanotubes for new MEMS applications
10. Low-resistance connections facilitate multi-walled carbon nanotubes for interconnects
11. USC scientists clone carbon nanotubes to unlock their potential for use in electronics
Post Your Comments:
Related Image:
NIST's 'nanotubes on a chip' may simplify optical power measurements
(Date:10/12/2017)... ... October 12, 2017 , ... DuPont ... today that they have entered into a multiyear collaboration to identify and characterize ... with additional tools for gene editing across all applications. , Under the terms ...
(Date:10/11/2017)... (PRWEB) , ... October 11, 2017 , ... ... Foundation President Andi Purple announced Dr. Suneel I. Sheikh, the co-founder, CEO ... ASTER Labs ), Inc. has been selected for membership in ARCS Alumni ...
(Date:10/11/2017)... INDIANAPOLIS , Oct. 11, 2017  VMS BioMarketing, a ... of a nationwide oncology Clinical Nurse Educator (CNE) network, which ... growing need for communication among health care professionals to enhance ... physicians, nurses, office staff, and other health care professionals to ... for breast cancer. ...
(Date:10/10/2017)... CALIF. (PRWEB) , ... October 10, 2017 , ... San ... part of its corporate rebranding initiative announced today. The bold new look is ... reach, as the company moves into a significant growth period. , It will also ...
Breaking Biology Technology:
(Date:4/11/2017)... BROOKLYN, N.Y. , April 11, 2017 /PRNewswire-USNewswire/ ... identical fingerprints, but researchers at the New York ... University College of Engineering have found that partial ... fingerprint-based security systems used in mobile phones and ... previously thought. The vulnerability lies in ...
(Date:4/6/2017)... , April 6, 2017 Forecasts ... ANPR, Document Readers, by End-Use (Transportation & Logistics, Government ... Oil, Gas & Fossil Generation Facility, Nuclear Power), Industrial, ... Other) Are you looking for a definitive ... ...
(Date:4/5/2017)... Today HYPR Corp. , leading innovator ... of the HYPR platform is officially FIDO® Certified ... architecture that empowers biometric authentication across Fortune 500 enterprises ... over 15 million users across the financial services industry, ... product suites and physical access represent a growing portion ...
Breaking Biology News(10 mins):