Navigation Links
Etched quantum dots shape up as single photon emitters, NIST tests show
Date:2/24/2011

Like snowflakes or fingerprints, no two quantum dots are identical. But a new etching method for shaping and positioning these semiconductor nanocrystals might change that. What's more, tests at the National Institute of Standards and Technology (NIST) confirm that etched quantum dots emit single particles of light (photons), boosting prospects for powering new types of devices for quantum communications.

The conventional way to build quantum dotsat NIST and elsewhereis to grow them like crystals in a solution, but this somewhat haphazard process results in irregular shapes. The new, more precise process was developed by NIST postdoctoral researcher Varun Verma when he was a student at the University of Illinois. Verma uses electron beam lithography and etching to carve quantum dots inside a semiconductor sandwich (called a quantum well) that confines particles in two dimensions. Lithography controls the dot's size and position, while sandwich thickness and compositionas well as dot sizecan be used to tune the color of the dot's light emissions.

Some quantum dots are capable of emitting individual, isolated photons on demand, a crucial trait for quantum information systems that encode information by manipulating single photons. In new work reported in Optics Express,* NIST tests demonstrated that the lithographed and etched quantum dots do indeed work as sources of single photons. The tests were performed on dots made of indium gallium arsenide. Dots of various diameters were patterned in specific positions in square arrays. Using a laser to excite individual dots and a photon detector to analyze emissions, NIST researchers found that dots 35 nanometers (nm) wide, for instance, emitted nearly all light at a wavelength of 888.6 nm. The timing pattern indicated that the light was emitted as a train of single photons.

NIST researchers now plan to construct reflective cavities around individual etched dots to guide their lig
'/>"/>

Contact: Laura Ost
laura.ost@nist.gov
303-497-4880
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

Page: 1 2

Related biology technology :

1. Quantum hot potato: NIST researchers entice 2 atoms to swap smallest energy units
2. Dr. Stefan Strauf of physics at Stevens receives NSF CAREER Award for quantum research
3. UCSB physicists challenge classical world with quantum-mechanical implementation of shell game
4. TU scientists in Nature: Better control of building blocks for quantum computer
5. Ben-Gurion University nano researcher to receive prestigious award for laser science and quantum physics
6. Quantum computers a step closer to reality thanks to new finding
7. Quantum entanglement in photosynthesis and evolution
8. This little light of mine: Changing the color of single photons emitted by quantum dots
9. UBC, Max Planck formalize partnership among worlds top quantum physicists
10. Single electron reader opens path for quantum computing
11. Optical chip enables new approach to quantum computing
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Etched quantum dots shape up as single photon emitters, NIST tests show
(Date:9/18/2014)... Sept. 18, 2014 Research and Markets ... Companion Diagnostics (Polymerase Chain Reaction, In-situ hybridization, Immunohistochemistry) Market ... their offering. The global companion diagnostics ... 22.7% from 2014 to 2019. Factors such as rising ... of companion diagnostics by the pharmaceutical industry, support from ...
(Date:9/18/2014)... , Sept. 18, 2014 /PRNewswire/ - Oncothyreon Inc. (NASDAQ: ... previously announced concurrent but separate underwritten offerings of 10,000,000 ... the public of $2.00 per share, for expected gross ... Series A Convertible Preferred Stock at a price to ... proceeds of $20 million. Each share of Series A ...
(Date:9/18/2014)... Skeletal dysplasia is a group of rare diseases ... and cartilage. Its onset hits at the fetal ... mutation in the gene encoding fibroblast growth factor ... types of skeletal dysplasia, thanatophoric dysplasia (TD), a ... birth and is often lethal, and achondroplasia (ACH), ...
(Date:9/18/2014)... The quest for the ultimate memory device for computing ... at The City College of New York led by ... exhibit both magnetic and ferroelectric properties. , Combining both ... can occur between them and for the devices that ... Combining these two properties in a single material, however, ...
Breaking Biology Technology:Global Companion Diagnostics (Polymerase Chain Reaction, In-situ hybridization, Immunohistochemistry) Market - Trends & Forecasts to 2019 2Global Companion Diagnostics (Polymerase Chain Reaction, In-situ hybridization, Immunohistochemistry) Market - Trends & Forecasts to 2019 3Oncothyreon Prices $40 Million Concurrent Public Offerings of Common Stock and Preferred Stock 2Oncothyreon Prices $40 Million Concurrent Public Offerings of Common Stock and Preferred Stock 3Researchers use iPS cells to show statin effects on diseased bone 2Researchers use iPS cells to show statin effects on diseased bone 3Oxides discovered by CCNY team could advance memory devices 2
... Ala. , May 12 Atherotech Inc. will exhibit its ... Scientific Sessions 2010. The meeting takes place May 13-16 at ... , , ... lipid test that routinely reports directly measured LDL-C, which is included in ...
... ,, RESEARCH TRIANGLE PARK, N.C. , May 12 ... Research Clinical Trials and Statistics Unit, is running the Intergroup Exemestane Study ... women with early breast cancer and a median follow-up period of 91 ... the data from multiple centers. , ...
... Indiana Seed Fund, Indiana ,s only targeted life sciences seed ... Indianapolis -based biotechnology start-up company focused on the development of ... , , , ... 5 million Americans suffer from Alzheimer,s disease (AD), a number that ...
Cached Biology Technology:Atherotech Emphasizes Predictive Value of VAP(R) Cholesterol Test at National Lipid Association Meeting 2Atherotech Emphasizes Predictive Value of VAP(R) Cholesterol Test at National Lipid Association Meeting 3Max Neeman International Signs Agreement for Data Management/EDC of Large Phase IV Trials from Multiple Sites 2BioCrossroads Invests in Indianapolis Biotech Company Developing Treatments for Alzheimer's Disease 2BioCrossroads Invests in Indianapolis Biotech Company Developing Treatments for Alzheimer's Disease 3BioCrossroads Invests in Indianapolis Biotech Company Developing Treatments for Alzheimer's Disease 4
(Date:9/18/2014)... and the Quebec government have discovered microplastics (in ... of Fisheries and Aquatic Sciences . , The ... industrial cleansers, to which they are commonly added ... buoyancy, they may readily pass through sewage treatment ... the world,s oceans, but have only recently been ...
(Date:9/18/2014)... Wis. No matter how many times it,s ... social, communicating creatures. , But by using ... organisms radically alter their behavior to suit their ... of them are present, and act accordingly. , ... millions, it may change from innocuous to pathogenic, ...
(Date:9/18/2014)... spoken language is unique to humans. "The genetic changes ... human evolution to make this possible are largely unknown, ... have," says Wolfgang Enard, Professor of Anthropology and Human ... molecular biological basis of language Enard has now taken ... study, undertaken in collaboration with scientists at several universities, ...
Breaking Biology News(10 mins):Microplastic pollution discovered in St. Lawrence River sediments 2Researchers study vital 'on/off switches' that control when bacteria turn deadly 2Researchers study vital 'on/off switches' that control when bacteria turn deadly 3Language evolution: Quicker on the uptake 2Language evolution: Quicker on the uptake 3
... TROY, N.Y., Aug. 8 Milliseconds can mean the,difference ... sports,leading more trainers and athletes to look toward technology ... A fluids mechanics professor at Rensselaer Polytechnic Institute ... help,American swimmers sharpen their strokes, shave seconds from their ...
... than a fly buzzing around the house. South Africans have ... bunch of Roridula gorgonias leaves. Attracted to the ... is soon trapped by the natural flypaper. However, this is ... is home to a population of Pameridea roridulae ...
... between triumph and defeat in the world of Olympic ... technology as a tool to get an edge on ... Polytechnic Institute in Troy, N.Y., is using experimental flow ... shave seconds from their lap times, and race toward ...
Cached Biology News:'Top Secret' Technology To Help U.S. Swimmers Trim Times at Beijing Olympics 2'Top Secret' Technology To Help U.S. Swimmers Trim Times at Beijing Olympics 3How nonstick bugs evade natural fly paper 2'Top secret' technology to help US swimmers trim times at Beijing Olympics 2'Top secret' technology to help US swimmers trim times at Beijing Olympics 3
Fas-ligand rabbit polyclonal antibody...
Mouse anti-JNK (PT183/185) Class: Antibody Product Group: Signalling molecules and phospho-specific Antibody...
TRIAL SIZE Anti-Kaede [2F4] Monoclonal Research Focus: tag Storage: -20C Shipping Temperature: 4C...
AANAT [Arylalkylamine N-acetyltransferase; EC 2.3.1.87]...
Biology Products: