Navigation Links
UCSB Physicists mix 2 lasers to create light at many frequencies
Date:3/31/2012

(Santa Barbara, Calif.) A team of physicists at UC Santa Barbara has seen the light, and it comes in many different colors. By aiming high- and low-frequency laser beams at a semiconductor, the researchers caused electrons to be ripped from their cores, accelerated, and then smashed back into the cores they left behind. This recollision produced multiple frequencies of light simultaneously. Their findings appear in the current issue of the science journal Nature.

"This is a very remarkable phenomenon. I have never seen anything like this before," said Mark Sherwin, whose research group made the groundbreaking discovery. Sherwin is a professor of physics at UCSB and a co-author of the paper. He is also director of the campus's Institute for Terahertz Science and Technology.

When the high-frequency optical laser beam hits the semiconductor material in this case, gallium arsenide nanostructures it creates an electron-hole pair called an exciton. The electron is negatively charged, and the hole is positively charged, and the two are bound together by their mutual attraction. "The high-frequency laser creates electrons and holes," Sherwin explained. "The very strong, low-frequency free electron laser beam rips the electron away from the hole and accelerates it. As the low-frequency field oscillates, it causes the electron to come careening back to the hole." The electron has excess energy because it has been accelerated, and when it slams back into the hole, the recombined electron-hole pair emits photons at new frequencies.

"It's fairly routine to mix the lasers and get one or two new frequencies, Sherwin continued. "But to see all these different new frequencies, up to 11 in our experiment, is the exciting phenomenon. Each frequency corresponds to a different color."

In terms of real-world applications, the electron-hole recollision phenomenon has the potential to significantly increase the speed of data transfer and c
'/>"/>

Contact: Andrea Estrada
andrea.estrada@ia.ucsb.edu
805-893-4620
University of California - Santa Barbara
Source:Eurekalert  

Page: 1 2 3

Related biology technology :

1. McGill physicists find a new state of matter in a transistor
2. U of T physicists squeeze light to quantum limit
3. Physicists discover important step for making light crystals
4. Nanophysicists find unexpected magnetic effect
5. NYU physicists find way to explore microscopic systems through holographic video
6. Physicists at UC Santa Barbara make discovery in quantum mechanics
7. U-M physicists create first atomic-scale map of quantum dots
8. Physicists capture first images of atomic spin
9. UBC, Max Planck formalize partnership among worlds top quantum physicists
10. UC Riverside physicists pave the way for graphene-based spin computer
11. Rice physicists discover ultrasensitive microwave detector
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
UCSB Physicists mix 2 lasers to create light at many frequencies
(Date:7/29/2015)... 29, 2015  AsureQuality and Ubiquitome have agreed ... applications in food and primary production sectors. The ... PCR device, the Freedom4. AsureQuality provides ... the supermarket shelf for producers, processors and Competent ... animal disease control and pest management and surveillance ...
(Date:7/29/2015)... 29, 2015 Research ... addition of the "Global Biosimilars Market, 2015 ... The Global Biosimilars Market, 2015 - 2025, ... growing biosimilars market. With the blockbuster biologics losing ... costs, biosimilars are being viewed as viable substitutes ...
(Date:7/29/2015)...  AmnioChor Inc., an early stage biotech startup based ... announce that the Musculoskeletal Transplant Foundation of ... their seed round of development of the proprietary AmnioCept™ ... AmnioChor,s technology allows cryopreservation of the amniotic ... living within those tissues. Amnion is a well-established source ...
(Date:7/29/2015)... DIEGO , July 29, 2015  Pfenex Inc. ... 2015 financial results will be released on Thursday, August ... am Eastern Time, Pfenex management will host a conference ... business update.  A press release outlining the financial results ... the call. Please call 1-866-376-8058 (US) or ...
Breaking Biology Technology:AsureQuality and Ubiquitome Partner on Applications for Mobile Molecular Food Safety Testing 2Global Biosimilars Market to 2025: Monoclonal Antibodies (mAbs), Insulin, Interferons, G-CSF/ GM-CSF, Erythropoietins and Others 2Global Biosimilars Market to 2025: Monoclonal Antibodies (mAbs), Insulin, Interferons, G-CSF/ GM-CSF, Erythropoietins and Others 3The Musculoskeletal Transplant Foundation Agrees to Invest in AmnioChor 2Pfenex To Report Second Quarter 2015 Results and Provide Business Update on Thursday, August 13, 2015 2
... FREDERICK, Md., Aug. 28 BioElectronics,Corporation, (Pink Sheets: ... a sales and distribution agreement to provide ActiPatch,Therapy ... order has been,shipped and introduction of ActiPatch to ... in the benefits of ActiPatch by the Healthcare ...
... AG (Frankfurt Stock Exchange: EVT) is pleased to invite you ... data for its,lead compound EVT 201 in the treatment of ... am GMT / 5.00 am EST / 7.00 pm AEST ... the webcast and,conference call will be: - Dr John ...
... Transfer its ADR Listing to the NASDAQ Capital ... Biopharmaceuticals,Ltd. (NASDAQ: XTLB ; LSE: XTL; TASE: ... and commercialization of,therapeutics for the treatment of unmet ... announced the receipt on August 23,2007, of a ...
Cached Biology Technology:BioElectronics Corporation Announces Singapore and Malaysia Sales 2Evotec to Present Details of the Positive Phase II Study in Insomnia With EVT 201 at the Worldsleep07 Congress in Cairns/Australia 2XTL Receives Staff Letter From NASDAQ 2XTL Receives Staff Letter From NASDAQ 3
(Date:7/21/2015)... , July 21, 2015 Passwords ... as seen in the recent U.S. Office of ... solution to the infosec conundrum, but developers and ... stored. To address this dilemma, Biometrics-as-a-Service provider HYPR ... Biometric Tokenization SDK for third party integration. ...
(Date:7/13/2015)... , July 13, 2015 Synaptics ... of human interface solutions, today announced sampling of ... and display driver integration (TDDI) product targeting smartphones ... first to combine Synaptics , best-in-class touch ... display driver technology developed in the company,s Japan ...
(Date:7/9/2015)... JOSE, Calif. , July 9, 2015  Synaptics ... interface solutions, announced today that it will report financial ... on Thursday, July 30, 2015 after the close of ... for analysts and investors at 2:00 p.m. PT (5:00 ...   To participate on the live call, ...
Breaking Biology News(10 mins):HYPR Corp. Launches Industry First Biometric Tokenization Platform 2HYPR Corp. Launches Industry First Biometric Tokenization Platform 3HYPR Corp. Launches Industry First Biometric Tokenization Platform 4Synaptics Announces Sampling of Second Generation TDDI Solutions 2Synaptics Announces Sampling of Second Generation TDDI Solutions 3Synaptics to Report Fourth Quarter, Fiscal Year 2015 Results on July 30 2
... Mass.--High oil prices, energy security considerations and fears about ... sources like biofuels, which burn cleanly and can be ... catches, particularly regarding biofuels like corn-based ethanol: the more ... available for fooda reality that partly accounts for the ...
... available in French. , Hunted to ... along the Pacific coast. Their reintroduction, however, is expected ... commercially valuable shellfish dramatically, such as sea urchins and ... Kai Chan, an NSERC-funded researcher at the University of ...
... The U.S. Department of Homeland,Security (DHS) ... additional,fingerprints from international visitors arriving at Orlando ... the department,s upgrade from two-,to 10-fingerprint collection ... more accurately and efficiently establishing and verifying,visitors, ...
Cached Biology News:MIT professor to discuss future of biofuels 2DHS Begins Collecting 10 Fingerprints From International Visitors at Orlando International Airport 2
b-Catenin (pSer675), phospho-specific...
MAb to Transferrin Dry Ice: No Preservative: NaN3 Availability When Not in Inventory: 14-21 Business Days...
Anti-ADAMTS-4, disintegrin-like domain Immunogen: Synthetic peptide - KLH conjugated Available Date: 38569...
WD-repeat protein 4...
Biology Products: