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:12/22/2014)... /PRNewswire/ - RepliCel Life Sciences Inc. (OTCQB: REPCF) (TSX.V: ... the development of autologous cell therapies, announced today the ... Calgary in conjunction with co-authors from Kyoto University and ... company,s ongoing clinical research using dermal sheath cup (DSC) ... The paper entitled " Hair Follicle Dermal Stem ...
(Date:12/22/2014)... December 22, 2014 The ... publication of original research, reviews and editorials addressing ... clinical practice, today published a provocative article exploring ... development, progression and potential treatment of prostate cancer. ... research and proposes the possibility that there could ...
(Date:12/19/2014)... Charm Sciences is pleased to announce ... of Aflatoxin M1 in raw commingled milk is the ... validation. The peer reviewed report of the validation by ... Agricultural and Fisheries Research (ILVO-T&V) has been published by ... the most toxic aflatoxin and a known carcinogen, can ...
(Date:12/19/2014)... 19, 2014 Bina Technologies, Inc. (Bina, ... they have been acquired by Roche (SIX: RO, ROG; ... held company that provides a big data platform for ... data for the academic and translational research markets.  Bina ... will continue to focus on development of their innovative ...
Breaking Biology Technology:Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 2Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 3Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 4Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 5Prostate Cancer Experts Dissect the Role of Follicle-stimulating Hormone in the Development, Progression and Potential Treatment of Prostate Cancer 2Prostate Cancer Experts Dissect the Role of Follicle-stimulating Hormone in the Development, Progression and Potential Treatment of Prostate Cancer 3Prostate Cancer Experts Dissect the Role of Follicle-stimulating Hormone in the Development, Progression and Potential Treatment of Prostate Cancer 4Charm Sciences Achieves Independent Validation of First 15 Minute Quantitative Screening Method for Aflatoxin M1 2Bina Technologies is acquired by Roche. 2Bina Technologies is acquired by Roche. 3
... to Host Conference Call at 12:30 p.m. Eastern Time, September 19, ... ... Sept. 19 Indevus,Pharmaceuticals, Inc. (Nasdaq: IDEV ) today announced that ... obtained the,United States rights to SANCTURA(R) and SANCTURA(R) XR. In connection with,Allergan,s ...
... Corporation,(Nasdaq: CRGN ), a clinical-stage biopharmaceutical company ... M.D., has been appointed,President and Chief Executive Officer, ... remain with the Company through the end,of 2007, ... on CuraGen,s,Board of Directors until the Annual Stockholders ...
... for ... inflammatory bowel disease., OKLAHOMA CITY, Sept. 18 Altheus Therapeutics, ... trials,testing the efficacy of its therapy for the treatment of inflammatory ... by the,Oklahoma Seed Capital Fund and Oklahoma Equity Partners. About ...
Cached Biology Technology:Indevus Announces Allergan as New Partner for SANCTURA Brand 2Indevus Announces Allergan as New Partner for SANCTURA Brand 3Indevus Announces Allergan as New Partner for SANCTURA Brand 4Indevus Announces Allergan as New Partner for SANCTURA Brand 5Indevus Announces Allergan as New Partner for SANCTURA Brand 6CuraGen Corporation Announces Appointment of Dr. Timothy M. Shannon as President and Chief Executive Officer 2CuraGen Corporation Announces Appointment of Dr. Timothy M. Shannon as President and Chief Executive Officer 3CuraGen Corporation Announces Appointment of Dr. Timothy M. Shannon as President and Chief Executive Officer 4CuraGen Corporation Announces Appointment of Dr. Timothy M. Shannon as President and Chief Executive Officer 5Altheus Therapeutics Secures $3.6 Million in Venture Capital 2
(Date:12/10/2014)... , Dec. 08, 2014 Research and Markets ... addition of the "Biometrics Market in Japan ... http://photos.prnewswire.com/prnh/20130307/600769 The ... such as rural banking and upgradation of the ... witnessed in the market. Besides the aforementioned projects, ...
(Date:12/5/2014)... , Dec. 4, 2014  Tute Genomics, a leader ... million in Series A1 funding led by UK-based Eurovestech. ... participated in the investment round. "We are ... community adopts next-generation sequencing and seeks new approaches for ... Reid Robison , MD MBA, and CEO of Tute ...
(Date:12/3/2014)... 2, 2014 As part of our commitment ... is pleased to announce the release of a new ... collect the workforce data that they need. ... left by existing readers. Many such devices have serious ... modern technology. Older models force users to navigate numerous ...
Breaking Biology News(10 mins):Biometrics Market in Japan 2014-2018: Key Vendors are DDS, Fujitsu, Hitachi and NEC 2Tute Genomics Raises $2.3 Million to Scale Up Cloud-Based Genome Analytics and Accelerate Personalized Medicine 2Tute Genomics Raises $2.3 Million to Scale Up Cloud-Based Genome Analytics and Accelerate Personalized Medicine 3Inception Technologies to Release New Biometric Reader 2
... A major step in commercializing the groundbreaking research ... University of Minnesota signed an exclusive, global license agreement ... worldwide attention in 2008 when her team announced that ... laboratory. The technology licensed to Miromatrix holds the ...
... Calif., Feb. 16, 2010 Butterfly experts have suspected for ... in explaining wing color diversity. Now, for the first time, ... at least in nine Heliconius species. ... ultraviolet colors also have UV-yellow pigment on their wings, reports ...
... coastal fog has decreased significantly over the past 100 years, ... according to a new study by University of California, Berkeley, ... a natural cycle of the result of human activity, but ... entire redwood ecosystem, the scientists say. , "Since 1901, the ...
Cached Biology News:U of Minnesota finalizes license agreement to form start-up company based on Doris Taylor research 2Butterfly vision, wing colors linked, UCI study finds 2Fog has declined in past century along California's redwood coast 2Fog has declined in past century along California's redwood coast 3Fog has declined in past century along California's redwood coast 4