(Press-News.org) A new proposed scheme, by Wen-Xing Yang, from the Department of Physics, Southeast University, China, and colleagues, analyzed in detail the optical steady behavior in GaAs quantum well structure driven by an elliptically polarized field (EPF) in a unidirectional ring cavity.
They show that the controllable optical steady behavior including multi-stability (OM) and optical bistability (OB) can be obtained via nonradiation coherence, and the frequency detuning, cooperation parameter and the amplitude of the EPF. Most interestingly, the conversion between OB and OM can be realized by adjusting the phase difference between two components of polarized electric field of the EPF. This investigation of the optical steady-state behavior of the probe field in SQW system may open up a new gate for the applications of the nonradiative coherence.
In essence, controllable optical steady behaviors including multi-stability (OM) and optical bistability (OB) are revealed for GaAs quantum wells driving by a single elliptically polarized field and a π-polarized probe field. Due to the existence of the robust nonradiative coherence, the potential to utilize the optical phase for developing the new all-optical switching devices is demonstrated.
More information on this MPLB article can be found at http://www.worldscientific.com/toc/mplb/28/15.
INFORMATION: END
Study: Controllable optical steady behavior obtainable from nonradiation coherence
2014-06-19
[Attachments] See images for this press release:
ELSE PRESS RELEASES FROM THIS DATE:
Iconic Minnesota conifers may give way to a more broad-leafed forest in the next century
2014-06-19
Houghton, Mich., June 19, 2014: Over the next 100 years, Minnesota's iconic boreal forest and deep snow may change into a deciduous forest with winters warm enough for some precipitation to fall as rain, according to a new U.S. Forest Service assessment of the vulnerability of Minnesota forests to climate change.
"Minnesota Forest Ecosystem Vulnerability Assessment and Synthesis" was published by the U.S. Forest Service's Northern Research Station and is available online at: http://www.nrs.fs.fed.us/pubs/45939
The assessment describes effects of climate change that ...
The sweetest calculator in the world
2014-06-19
Jena (Germany) In a chemistry lab at the Friedrich Schiller University Jena (Germany): Prof. Dr. Alexander Schiller works at a rectangular plastic board with 384 small wells. The chemist carefully pipets some drops of sugar solution into a row of the tiny reaction vessels. As soon as the fluid has mixed with the contents of the vessels, fluorescence starts in some of the wells. What the Junior Professor for Photonic Materials does here – with his own hands – could also be called in a very simplified way, the 'sweetest computer in the world'. The reason: the sugar molecules ...
Cochrane Review -- Effectiveness of antimicrobial drugs to treat cholera
2014-06-19
Researchers from the Cochrane Infectious Diseases Group, co-ordinated through the editorial base in LSTM, conducted an independent review of the effects of treating cholera with antimicrobial drugs, published in The Cochrane Library today.
Cholera is an acute watery diarrhoea caused by infection with the bacterium Vibrio cholerae, which can cause rapid dehydration and death. Effective treatment requires early diagnosis and rehydration using oral rehydration salts or intravenous fluids. This review looked at the effects of adding antimicrobial drugs to this treatment.
Thirty-nine ...
Synaptic levels of clathrin protein are important for neuronal plasticity
2014-06-19
Researchers of the group of cellular and molecular neurobiology of the Bellvitge Biomedical Research Institute (IDIBELL) and the University of Barcelona, led by researcher Artur Llobet, have shown that synaptic levels of the protein clathrin are a determinant factor for synaptic plasticity of neurons.
Chemical synapses and synaptic vesicular transmission cycle
Neurons transmit information in a specialized contact points called synapses. These structures consist of two elements: the presynaptic one, information donor, and postsynaptic, which receives the information. In ...
Children consuming a Mediterranean diet are 15 percent less likely to be overweight
2014-06-19
A study of 8 European countries presented at this year's European Congress on Obesity (ECO)in Sofia, Bulgaria, shows that children consuming a diet more in line with the rules of the Mediterranean one are 15% less likely to be overweight or obese than those children who do not.
The research is by Dr Gianluca Tognon, University of Gothenburg, Gothenburg, Sweden, and colleagues across the 8 countries: Sweden, Germany, Spain, Italy, Cyprus, Belgium, Estonia and Hungary.
The researchers used data from the IDEFICS study (Identification and Prevention of Dietary – and lifestyle ...
Recreational football reduces high blood pressure in mature women
2014-06-19
The World Cup in Brazil may be attracting a global armchair audience of millions, but new research has shown that playing football could help lower blood pressure in women aged 35-50.
Women within this age group with mild high blood pressure achieve a significant reduction in blood pressure and body fat percentage through playing recreational football for 15 weeks. This is the finding of a new study conducted in a collaboration between researchers across four countries, including Professor Peter Krustrup of the University of Exeter.
The acclaimed Scandinavian Journal ...
MA healthcare reform does not have early impact on disparities in cardiovascular care
2014-06-19
New research by the Brigham and Women's Hospital, in partnership with Howard University College of Medicine, explores the effect of healthcare reform in Massachusetts on coronary intervention and mortality in adults by race/ethnicity, gender and the level of education in the neighborhood where the patient resides.
Published in the June 17, 2014, issue of Circulation, the journal of the American Heart Association, these findings indicate that healthcare reform in Massachusetts has not yet impacted the likelihood of receiving coronary interventions by gender, race/ethnicity ...
Study offers evidence that sunscreen use in childhood prevents melanoma in adults
2014-06-19
SAN ANTONIO, June 19, 2014 – Research conducted at the Texas Biomedical Research Institute, published in the latest issue of the scientific journal Pigment Cell and Melanoma, has established unequivocally in a natural animal model that the incidence of malignant melanoma in adulthood can be dramatically reduced by the consistent use of sunscreen in infancy and childhood.
According to senior author John L. VandeBerg, Ph.D., the research was driven by the fact that, despite the increasing use of sunscreen in recent decades, the incidence of malignant melanoma, the most ...
Football improves strength in men with prostate cancer
2014-06-19
Men with prostate cancer aged 43‒74 achieve bigger and stronger muscles, improve functional capacity, gain positive social experiences and the desire to remain active through playing football for 12 weeks. These are the findings of the "FC Prostate" trial, jointly conducted by the University Hospitals Centre for Health Care Research at The Copenhagen University Hospital, Rigshospitalet and the Copenhagen Centre for Team Sport and Health at the University of Copenhagen.
Some of the participants in the FC Prostate Cancer research project after a training session. ...
Following direction: How neurons can tell top from bottom and front from back
2014-06-19
TORONTO – The question of how neurons and their axons establish spatial polarity and direction in tissues and organs is a fundamental question of any organism or biological system. Our cells and axons precisely orient themselves in response to external cues, but what are the core pathways and how are they integrated?
Lead author Dr. Naomi Levy-Strumpf and principal investigator Dr. Joseph Culotti developed a novel conceptual framework, published on-line in PLoS GENETICS, June 5 2014.
They investigated netrin and Wnt, signaling pathways that are implicated in cancer ...