Navigation Links
New device hides, on cue, from infrared cameras
Date:11/26/2012

dergoes a dramatic transition. The crystal quickly rearranges itself as the temperature approaches a critical value. Metallic islands appear as specks, scattered throughout the material, with more and more appearing until it has become uniformly metallic.

"Right near this insulator-to-metal transition, you have a very interesting mixed medium, made up of both insulating and metallic phases," says coauthor Shriram Ramanathan, Associate Professor of Materials Science at SEAS, who synthesized the thin film. "It's a very complex and rich microstructure in terms of its electronic properties, and it has very unusual optical properties."

Those properties, when manipulated correctly, happen to be ideal for infrared absorption.

Meanwhile, the underlying sapphire substrate has a secret of its own. Usually transparent, its crystal structure actually makes it opaque and reflective, like a metal, to a narrow subset of infrared wavelengths.

The result is a combination of materials that internally reflects and devours incident infrared light.

"Both of these materials have lots of optical losses, and we've demonstrated that when light reflects between lossy materials, instead of transparent or highly reflective ones, you get strange interface reflections," explains lead author Mikhail Kats, a graduate student at SEAS. "When you combine all of those resulting waves, you can coax them to destructively interfere and completely cancel out. The net effect is that a film one hundred times thinner than the wavelength of the incident light can create perfect absorption."

The challenge for Capasso, Ramanathan, Kats, and their colleagues was not only to understand this behavior, but also to learn how to fabricate pure enough samples of the vanadium dioxide.

"Vanadium oxide can exist in many oxidation states, and only if you have VO2 does it go through a metal-insulator transition close to room temperature," Ramanathan explains. "
'/>"/>

Contact: Caroline Perry
cperry@seas.harvard.edu
617-496-1351
Harvard University
Source:Eurekalert  

Page: 1 2 3

Related biology technology :

1. New portable device enables RNA detection from ultra-small sample in only 20 minutes
2. All Market Research Predicts the Global Ophthalmology Devices Market Will Reach $18,286.4 Million in 2018
3. New UCLA Engineering research center to revolutionize nanoscale electromagnetic devices
4. Center will create self-powered health monitoring devices
5. Surgical Equipment Market (Surgical Sutures, Surgical Hand Instruments And Electrosurgical Devices) - Global Forecast, Market Share, Size, Growth And Industry Analysis (2010-2017): Twease.org
6. Global Endoscopy Devices Market is Expected to Reach USD 10.8 Billion in 2017: Transparency Market Research
7. MarketsandMarkets: Global Spine Surgery Devices Market Worth $14.8 Billion by 2017
8. Neonatal and Preterm Infants Enteral Feeding Devices Market is Expected to Reach USD 2.62 Billion Globally by 2018: Transparency Market Research
9. Former FDA Inspectors Train Medical Device, Pharmaceutical Companies How to Prepare for FDA Inspections of Their Quality Systems
10. UK research paves way to a scalable device for quantum information processing
11. UMass Amherst, Harvard experts say better systems needed for medical device cybersecurity
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
New device hides, on cue, from infrared cameras
(Date:8/27/2014)... (PRWEB) August 27, 2014 Flagship Biosciences ... services to the pharmaceutical and medical device industries, ... The fast growing company has consolidated its histology ... and Boulder to Westminster, CO, just north of Denver. ... Lab, 7575 W. 103rd Ave., Suite 100, Westminster, CO ...
(Date:8/27/2014)... Aug. 27, 2014 Research and Markets ... Isotope Ratio Mass Spectrometer Industry Report 2014" report ... Isotope Ratio Mass Spectrometer Industry Report 2014 is a ... the global isotope ratio mass spectrometer industry. ... including definitions, classifications, applications and industry chain structure. The ...
(Date:8/27/2014)... Aug. 27, 2014 Tris Pharma, a specialty ... today announced that it has been selected as an ... Association,s 2014 Awards for Excellence competition in ... independent panel of judges from SCORE (Counselors to America,s ... will be honored at a gala event to be ...
(Date:8/27/2014)... 27, 2014 BIOEQUA, an innovative line ... use of a handheld spray, has made its EQUA ... , The brand began with an unexpected discovery ... surprised to learn that the application of nanospray technology ... and delivered directly to skin's basal layer. This resulted ...
Breaking Biology Technology:Flagship Biosciences Announces Relocation and Expansion 2Global Stable Isotope Ratio Mass Spectrometer Industry Report 2014 2Tris Pharma Selected as an award winner in the New Jersey Business & Industry Association's 2014 Awards for Excellence 2BIOEQUA'S EQUA ESSENTIAL Product Line Redefines Skin Care & Now Available in America 2
... Alfalight , a firm that makes high-power ... has established ties with Chinese distributor Sanetronic Company ... Hong Kong. The company was founded in 1987 as ... has eight offices in China, including Beijing, Shanghai, Shenzhen, ...
... research, nanotechnology, farm waste management and produce storage have emerged ... Transfer Award. , ,Judges for the contest have winnowed the ... The $5,000 grand prize will be presented to the winner ... in Milwaukee. , ,The finalists are: , , GHD ...
... The Joint Finance Committee rejected Governor Jim Doyle's proposal for ... The proposal, a plan to charge consumers for their music, ... several proposals turned down by the budget review panel. , ... on electronic entertainment called by some detractors the "iPod ...
Cached Biology Technology:Five remaining firms vie for Tech Transfer award 2Five remaining firms vie for Tech Transfer award 3Finance Committee rejects extra tax on Internet buys 2Finance Committee rejects extra tax on Internet buys 3
(Date:8/27/2014)... effective doses of the HIV drug maraviroc, a new ... completed before the drug was licensed in 2007, included ... key to removing maraviroc from the body. The current ... protein including nearly half of African-Americans end ... those who lack the protein even when given the ...
(Date:8/27/2014)... neural circuits in the brain of mice, scientists ... The research, led by Howard Hughes Medical Institute ... Technology (MIT), reveals that the connections between the ... about an experience and the part of the ... experience are malleable. , Altering those connections ...
(Date:8/27/2014)... to listen carefully to someone, the first thing we ... is stop moving altogether. This strategy helps us hear ... movements. , This interplay between movement and hearing also ... evidence has long suggested that the brain,s motor cortex, ... gives rise to our conscious perception of sound. , ...
Breaking Biology News(10 mins):Dosage of HIV drug may be ineffective for half of African-Americans 2Researchers change the emotional association of memories 2Researchers change the emotional association of memories 3Researchers change the emotional association of memories 4Stop and listen: Study shows how movement affects hearing 2Stop and listen: Study shows how movement affects hearing 3
... ORLANDO, Fla. Soy food consumption did not ... survivors of breast cancer, according to the results of ... 2011, held April 2-6. Researchers investigated the association ... survivors, using data from a multi-institution collaborative study, the ...
... America (ESA) has selected 37 insect-science symposia for its ... http://entsoc.org/entomology2011 ). The symposia will address important ... Disorder, insect control, invasive species, medical and veterinary entomology, ... BEES AND COLONY COLLAPSE DISORDER Bee ...
... premature aging of immune cells, which may make people more ... new UCSF-led study. The findings indicate that accelerated ... is dependent upon how long someone is depressed, particularly if ... March 2011 by the journal PLoS One and ...
Cached Biology News:Soy isoflavones not a risk for breast cancer survivors 2Entomology 2011 symposia selected 2Entomology 2011 symposia selected 3Study finds link between chronic depression and accelerated immune cell aging 2Study finds link between chronic depression and accelerated immune cell aging 3
... Rotofor purification system with PowerPac 3000 power ... separation and purification by liquid-phase isoelectric focusing ... (18 ml) and standard (60 ml) focusing ... chambers, PowerPac 3000 power supply, 10 ml ...
... Imager VersaDoc MP 4000 System is ... imaging system capable of supporting a ... fluorescence, chemiluminescence, densitometry, and chemiflourescence. ... allow imaging of multiplexed fluorescent samples, ...
...
...
Biology Products: