Navigation Links
Engineers demonstrate first room-temperature semiconductor source of coherent Terahertz radiation
Date:5/19/2008

generation of Terahertz radiation occurs via the process of difference-frequency generation inside the laser material at room temperature at a frequency of 5 THz (equal to the difference of the two mid-infrared QCL frequencies).

Mid-infrared QCLs were invented and demonstrated by Capasso and his team at Bell Labs in 1994. The compact millimeter length semiconductor lasers operate routinely at room temperature with high optical powers and are increasingly used in the commercial sector for wide range of applications in chemical sensing and trace gas analysis. The devices, made by stacking ultra-thin atomic layers of semiconductor materials on top of each other, are variable and tunable, allowing an engineer to adjust the energy levels in the structure to create artificial laser medium.

"Terahertz imaging and sensing is a very promising but relatively new technology that requires compact, portable and tunable sources to achieve widespread penetration. Our devices are an important first step in this direction," said Capasso. "We believe our THz source has great development potential because the nanoscale material used was grown by Molecular Beam Epitaxy, a commercial and widely used thin film growth technique which 'spray paints' atoms on a surface one layer at a time."

The ability of Terahertz rays to penetrate efficiently through paper, clothing, cardboard, plastic and many other materials makes them ideal for use in many applications. For example, a device emitting T-rays could be used to image concealed weapons, detect chemical and biological agents through sealed packages, see tumors without causing any harmful side effects, and spot defects within materials such as cracks in the Space Shuttle's foam insulation.


'/>"/>

Contact: Michael Patrick Rutter
mrutter@seas.harvard.edu
617-496-3815
Harvard University
Source:Eurekalert  

0

GOOD

Page: 1 2

Related biology technology :

1. Penn engineers design computer memory in nanoscale form that retrieves data 1,000 times faster
2. Penn engineers design computer memory in nanoscale form that retrieves data 1,000 times faster
3. Harvard University engineers demonstrate quantum cascade laser nanoantenna
4. Cardiff University engineers give industry a moths eye view
5. Surface dislocation nucleation: Strength is but skin deep at the nanoscale, Penn engineers discover
6. Engineers make first active matrix display using nanowires
7. Engineers harness cell phone technology for use in medical imaging
8. Nanowires may boost solar cell efficiency, UC San Diego engineers say
9. Elekta Demonstrates Commitment to Stereotactic Innovation at EANS
10. New Phase III Data Demonstrate Oxycodone / Naloxone Combination Tablet Reduces Opioid-Induced Bowel Dysfunction in Patients With Chronic Severe Pain
11. ChemoCentryx Demonstrates Recently Discovered Chemokine Receptor CXCR7 is Essential in Tumor Growth
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Engineers demonstrate first room-temperature semiconductor source of coherent Terahertz radiation
(Date:5/21/2013)... Bed bugs have become so widespread in ... many turn to chemical-based pesticides for help to completely get ... risks those solutions present, the company advised the public to ... , According to My Cleaning Products, chemical-based pesticides are ... be. It shared that the pests have already developed immunity ...
(Date:5/21/2013)... Ontario (PRWEB) May 21, 2013 ... scientists of the ITN to design the study, ... of two key clinical models used in the ... (EEC) and Nasal Allergen Challenge (NAC) models. Although ... by numerous publications, to date no direct comparison ...
(Date:5/21/2013)... SoundConnect is pleased to announce the release ... in Canada. Lync is the next generation of ... and organizations to collaborate and communicate much more easily ... the United States. With the progressive rollout of Lync ... Canada, SoundConnect now offers a complete Microsoft Lync solution ...
(Date:5/21/2013)... CA (PRWEB) May 21, 2013 Clinovo's ... is an 8-week training program starting on June 11th, ... help clinical trial professionals reach the next step in ... Dentons Offices in Palo Alto, and streamed online. , ... of award-winning papers, Clinovo's new “CDISC Standards: Theory and ...
Breaking Biology Technology:New Guide to Kill Bed Bugs Published by My Cleaning Products, Company Enumerates Non-Toxic Means to Clear the Pests 2New Guide to Kill Bed Bugs Published by My Cleaning Products, Company Enumerates Non-Toxic Means to Clear the Pests 3Inflamax Research selected by the Immune Tolerance Network and the National Institutes of Health to conduct a landmark clinical study on the underlying mechanisms of allergic inflammation. 2SoundConnect Announces Microsoft Lync Release in Canada 2SoundConnect Announces Microsoft Lync Release in Canada 3Clinovo Launches TechTrainings on CDISC Standards 2
... , , SAO PAULO , Feb. ... to postpone a decision to reduce Brazil,s ,ethanol import duty from ... to be announced, but not for its impact to take effect once ... it describes as little more than a "bureaucratic" delay. , ...
... , SAN FRANCISCO , ... a leader in Integrated Voice Response (IVR)/Integrated Web Response (IWR) ... allows users to design and deploy clinical trial Integrated Response ... of clinical trials. This time and cost savings stems from ...
... ... nematodes as the Divergence and National Corn Growers Association continues collaboration. , ... (PRWEB) February 9, 2010 -- ... Research (SBIR) grants totaling $500,000, along with renewed funding from the National Corn Growers ...
Cached Biology Technology:Brazilian Sugarcane Industry Association Stresses Need for Brazil's Government to Announce Ethanol Import Tariff Cut as Soon as Possible 2Brazilian Sugarcane Industry Association Stresses Need for Brazil's Government to Announce Ethanol Import Tariff Cut as Soon as Possible 3endpoint Saves Money and Time for Medical Research Teams Through PULSE 2endpoint Saves Money and Time for Medical Research Teams Through PULSE 3New Funding Validates Importance of Divergence's Work on Nematodes 2New Funding Validates Importance of Divergence's Work on Nematodes 3
(Date:5/18/2013)... An increasing number of U.S. children are experiencing ... to research presented at Digestive Disease Week (DDW). ... at the Cleveland Clinic Children,s Hospital found that ... breath compared to their lean counterparts. The pattern ... can be correlated to potential complications associated with ...
(Date:5/17/2013)... white noise of the South, but the night belongs to ... hangs heavy from the humidity and the sounds of wildlife. ... of frogs, toads and salamanders, is the center of amphibian ... are the auditorium for their symphonic choruses, the scientists of ... ARMI, have front-row seats. , Amphibians, which rely ...
(Date:5/17/2013)... will celebrate the science and technology of the ... during the inaugural Atlanta Science Festival, March 22-29, ... museums, corporations, K-12 schools and universities, the festival ... children and adults at venues across the city. ... The annual Atlanta Science Festival is a collaboration ...
Breaking Biology News(10 mins):New research identifies risks, interventions for children's GI health 2New research identifies risks, interventions for children's GI health 3Front-row seats to climate change 2Front-row seats to climate change 3Front-row seats to climate change 4First Atlanta Science Festival set for 2014 2
... around the world are breathing a sigh of ... of being harvested for their natural disease-fighting substances. ... which lives symbiotically inside the sea squirt, actually ... day be used in cancer treatment. , Despite ...
... of Iowa Biological Sciences Professor Daniel F. Eberl and his ... deafness in fruit flies that may shed light on deafness ... the Usher 1B Syndrome in Humans, Lead to Deafness in ... of the journal Current Biology. , Eberl says their recent ...
... be fused with large, protein-based drugs such as granulocyte ... that is capable of surviving the journey through the ... into the bloodstream to be used by the body, ... School of Pharmacy. , This technology may allow for ...
Cached Biology News:UI researcher studies deafness in fruit flies, humans 2Recombinant DNA technology may enable oral, rather than injectable, delivery of protein drugs 2Recombinant DNA technology may enable oral, rather than injectable, delivery of protein drugs 3
... catalyzes the formation of phosphodiester bonds in ... with 3' hydroxyl and 5' phosphate termini. ... ligation which can be performed in 5 ... substrates for this enzyme. A T4 ...
Bovine Renal Artery Smooth Muscle Cells (BRASMC) (>500,000 cells)...
... BioControl is a major step forward ... liquid handling system - with one ... cone modules. All five single channel ... fit one handle. The lightweight handle ...
Sulfadimethoxine (CH-2027)...
Biology Products: