Navigation Links
Researchers realize high-power, narrowband terahertz source at room temperature
Date:12/12/2011

wo mid-infrared laser beams within a single semiconductor chip in the presence of a giant nonlinearity. This nonlinearity allows for new terahertz photons to be created within the same chip with an energy equal to the difference of the mid-infrared lasers' energies. As mid-infrared lasers based on quantum cascade laser technology are operable at room temperature, the terahertz emission can also be demonstrated at room temperature.

Razeghi and her group at the Center for Quantum Devices have taken this basic approach a step further by addressing two key issues that have limited the usefulness of initial demonstrations. Razeghi's group currently leads the world in high-power quantum cascade laser technology; by increasing the power and beam quality of the mid-infrared pumps, the terahertz power has been significantly increased by more than a factor of 30 to ~10 microwatts.

Additionally, the researchers have incorporated a novel dual-wavelength diffraction grating within the laser cavity to create single mode (narrow spectrum) mid-infrared sources, which in turn has led to very narrow linewidth terahertz emission near 4 terahertz. Further, due to the novel generation mechanism, the terahertz spectrum is extremely stable with respect to current and/or temperature. This could make it valuable as a local oscillator, which can be used for low light level receivers like those needed for astronomical applications.

Razeghi said her group will continue in hopes of reaching higher power levels.

"Our goal is to reach milliwatt power levels and incorporate tuning within the device," Razeghi said. "Theory says that it is possible, and we have all of the tools necessary to realize this potential."


'/>"/>

Contact: Megan Fellman
fellman@northwestern.edu
847-491-3115
Northwestern University
Source:Eurekalert

Page: 1 2

Related biology technology :

1. Understanding the science of solar-based energy: more researchers are better than one
2. Researchers decode viral process that prepares cells for HIV infection
3. Dartmouth researchers advance cellulosic ethanol production
4. Researchers develop new model for cystic fibrosis
5. Use it or lose it? Researchers investigate the dispensability of our DNA
6. Sigma-Aldrich and the University of Illinois Offer New Boronic Acid Surrogates to Researchers Worldwide Through Licensing Agreement
7. Researchers write protein nanoarrays using a fountain pen and electric fields
8. Researchers show how to stamp nanodevices with rubber molds
9. The Lancets New Online Medical Journal Helps Clinicians and Medical Researchers Find Practice-Changing Evidence Quickly and Easily
10. Ultrafast lasers give CU-Boulder researchers a snapshot of electrons in action
11. VAP(R) Cholesterol Test Helps Researchers Identify Treatment Effects of Combination Therapy
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/31/2014)... , July 31, 2014   BioLife Solutions , ... manufacturer and marketer of proprietary clinical grade hypothermic ... precision thermal shipping products for cells and ... 2014 financial results will be released on Thursday, August ... conference call and live webcast at 4:30 p.m. ET ...
(Date:7/31/2014)... Sales Horizons, a leader in sales training, today ... – Mastering the Complex Sale – to ... proven sales training programs used by thousands of salespeople ... sales training course is available to every salesperson as ... customers, like technical support, engineers, clinical support, and IT ...
(Date:7/30/2014)... 2014  Decision Resources Group finds that the ... the United States believe ... will be the level of savings achievable by ... lower cost to patients. Payers plan to leverage ... pricing expectations in order to encourage physician prescribing ...
(Date:7/30/2014)... While administrative claims and other data ... a relatively long period of time, there has ... of these ‘big data’ for comparisons of interventions ... powerful computer technology with the plethora of data ... significant promise for identifying optimal interventions for specific ...
Breaking Biology Technology:BioLife Solutions to Report Financial Results for Second Quarter 2014 and Provide Business Update on August 7, 2014 2Sales Horizons Offers Mastering the Complex Sale - a Comprehensive, Online Sales Skills Training Course 2Sales Horizons Offers Mastering the Complex Sale - a Comprehensive, Online Sales Skills Training Course 3Surveyed U.S. Payers Expect Cost Savings to MCOs and Patients to be the Strongest Drivers of Biosimilar Uptake 2Surveyed U.S. Payers Expect Cost Savings to MCOs and Patients to be the Strongest Drivers of Biosimilar Uptake 3Leveraging ‘Big Data’ - Methodological Considerations in Health Services Research, New Webinar Hosted by Xtalks 2
... , , , , Multiporator / Electroporator 2510 , , , ... Transformation Protocol , Protocol No. 4308 915.521 02/2002 , ... , , , , ... , Cell type , Bacteria, gram ...
... , , , , , , , ... No. 4308 915.520 12/2001 , , , , , , ... Microorganism , Listeria monocytogenes 23074, ... Bacteria, gram positive, , , ...
... , , , , , , Multiporator / Electroporator 2510 , , ... , Transformation Protocol , Protocol No. 4308 ... , , , , , , ... , , Cell type , ...
Cached Biology Technology:Mycobacterium intracellulare 2Listeria monocytogenes 2Escherichia coli K12 2Escherichia coli K12 3
(Date:7/31/2014)... same week that the U.S. surgeon general issued a ... at Montana State University published a paper breaking new ... every cell responds when exposed to ultraviolet (UV) ... damage by the UV rays found in sunlight. This ... degenerative eye diseases. , "Our paper advances foundational ...
(Date:7/31/2014)... or fat cells, are inherently different. Each of these ... own role in metabolism. In the human body, white ... primary function is energy storage. On the other hand, ... are only found in a few places in the ... type of brown adipocytes, appear mixed with brown adipocytes ...
(Date:7/30/2014)... University is paving the way for a breakthrough ... military troops exposed to poisonous chemicalsparticularly those in ... in the current issue of the journal ... which are compounds commonly used in pesticides and ... NYU School of Engineering Associate Professor of Chemical ...
Breaking Biology News(10 mins):New paper describes how DNA avoids damage from UV light 2New paper describes how DNA avoids damage from UV light 3Hope for the overweight 2Engineering a protein to prevent brain damage from toxic agents 2
... study of biological, technological, and social complexity -- can ... In a May 1 Nature paper, Hierarchical structure and ... Institute (SFI) researchers Aaron Clauset, Cristopher Moore, and Mark ... as a hierarchy of modules, where nodes cluster together ...
... at UC San Diego have identified a potential red ... microscopic algae accumulate rapidly in dense concentrations have been ... millions of dollars in worldwide losses to fisheries and ... more broadly referred to as harmful algal blooms, remain ...
... whose prostate cancer screenings show high grade prostatic intraepithelial ... diagnoses they are told prostate cancer has not ... to undergo repeated needle biopsies as a precaution. ... distinguishing between HG-PIN lesions destined to become cancerous and ...
Cached Biology News:Nature paper describes technique for extracting hierarchical structure of networks 2Scripps Oceanography Research pegs ID of red tide killer 2Scripps Oceanography Research pegs ID of red tide killer 3Biomarker predicts malignancy potential of HG-PIN lesions in the prostate 2Biomarker predicts malignancy potential of HG-PIN lesions in the prostate 3
8 different frozen tissues are mounted on positively charged glass slides...
Tracker Datamatrix TRxD reads any 1D and 2D barcodes within 0.5 seconds....
Complete cell culture media with cytokines...
... multiple tissue panels are designed for ... genes or proteins of interest in ... on positively charged glass slides. Total ... the identical format, and cDNA from ...
Biology Products: