PRESS-NEWS.org - Press Release Distribution
PRESS RELEASES DISTRIBUTION

Achieving UV nonlinearity with a wide bandgap semiconductor waveguide

2021-06-09
(Press-News.org) The field of ultrafast nonlinear photonics has now become the focus of numerous studies, as it enables a host of applications in advanced on-chip spectroscopy and information processing. The latter in particular requires a strongly intensity-dependent optical refractive index that can modulate optical pulses faster than even picosecond timescales and on sub-millimeter scales suitable for integrated photonics.

Despite the tremendous progress made in this field, there is currently no platform providing such features for the ultraviolet (UV) spectral range, which is where broadband spectra generated by nonlinear modulation can be used for new on-chip ultrafast chemical and biochemical spectroscopy devices.

Now, an international team of scientists including EPFL have achieved giant nonlinearity of UV hybrid light-matter states ("exciton-polaritons") up to room temperature in a waveguide made of AlInGaN, a wide bandgap semiconductor material behind the solid-state lighting technology (e.g. white LEDs) and blue laser diodes.

Published in Nature Communications, the study is a collaboration between the University of Sheffield, ITMO Saint Petersburg, Chalmers University of Technology, the University of Iceland, and the LASPE at EPFL's Institute of Physics of the School of Basic Sciences.

The scientists used a compact 100 ?m-long device, to measure an ultrafast nonlinear spectral broadening of UV pulses with a nonlinearity 1000 times larger than that observed in common UV nonlinear materials, which is comparable to non-UV polariton devices.

Using AlInGaN is a significant step toward a new generation of integrated UV nonlinear light sources for advanced spectroscopy and measurement. "The AlInGaN system is a highly robust and mature semiconductor platform that shows strong excitonic optical transitions up to room temperature in the UV spectral range," says EPFL's Raphaël Butté, who worked on the study.

INFORMATION:

The authors state: "The nonlinear exciton interactions in our system are comparable to those in other polariton material systems, such as GaAs and perovskites, which, however, do not simultaneously operate in the UV and up to room temperature."

Reference D. M. Di Paola, P. M. Walker , R. P. A. Emmanuele, A. V. Yulin, J. Ciers, Z. Zaidi, J.-F. Carlin, N. Grandjean, I. Shelykh, M. S. Skolnick, R. Butté, D. N. Krizhanovskii. Ultrafast-nonlinear ultraviolet pulse modulation in an AlInGaN polariton waveguide operating up to room temperature. Nature Communications 09 June 2021. DOI: 10.1038/s41467-021-23635-6



ELSE PRESS RELEASES FROM THIS DATE:

Scientists discover new exoplanet with an atmosphere ripe for study

Scientists discover new exoplanet with an atmosphere ripe for study
2021-06-09
An international group of collaborators, including scientists from NASA's Jet Propulsion Laboratory and The University of New Mexico, have discovered a new, temperate sub-Neptune sized exoplanet with a 24-day orbital period orbiting a nearby M dwarf star. The recent discovery offers exciting research opportunities thanks to the planet's substantial atmosphere, small star, and how fast the system is moving away from the Earth. The research, titled TOI-1231 b: A Temperate, Neptune-Sized Planet Transiting the Nearby M3 Dwarf NLTT 24399, will be published in a future issue of The Astronomical Journal. The exoplanet, TOI-1231 b, was detected ...

Localized the gene for blue plum skin

Localized the gene for blue plum skin
2021-06-09
The presence and accumulation of the antioxidant pigment anthocyanin dictates fruit hue in plums, and the synthesis of this compound is known to be regulated by the MYB10 genes. Now, researchers from the Centre for Research in Agricultural Genomics (CRAG) and the Institute of Agrifood Research and Technology (IRTA) have found the gene that determines Japanese plum skin colour. In a END ...

Preliminary genetic link to developmental coordination disorder, dyspraxia identified

2021-06-09
New research by scientists at Oxford Brookes University has identified specific genes which could provide vital information about the biology of developmental coordination disorder (DCD), also known as dyspraxia. Dyspraxia is a common motor coordination condition which is estimated to affect at least one child in every classroom. DCD can impact a child's handwriting and coordination skills such as tying a shoelace or catching a ball. The condition can limit school achievement, impact cognitive development, constrain career opportunities and increase children's risk of developing mental health issues. Despite the condition affecting five per cent of children, as common as dyslexia or autism, very little is known about why some children struggle ...

Nintendo® wii may help improve balance in children with cerebral palsy

2021-06-09
Therapy based on the Nintendo® Wii Balance Board can help improve balance in children with cerebral palsy, according to an analysis published in END ...

New analysis examines survival of older patients who undergo heart transplantation

2021-06-09
Advanced age is often considered a contraindication for heart transplantation, but a new study published in the END ...

A new bacteria, made in Belgium (and UCLouvain)

2021-06-09
It all started, when Patrice Cani, FNRS researcher at University of Louvain (UCLouvain), and his team repeatedly observed that a bacterium (called Subdoligranulum) is almost absent in obese and diabetic people, while it is systematically present in healthy people. So, they decided to take a closer look at this "family" of bacteria. There is as yet only one cultivated strain of this family available in the world (the only known member of a large family) and, no luck, it is not the strain that was observed to be decreased in sick people. This is not unusual: nearly 70% of bacteria in the intestine have not yet been identified (this is called the dark matter of the ...

How should counselors broach topics of race, ethnicity, and culture?

2021-06-09
It's incumbent upon counselors to initiate or respond to clients' concerns about racial, ethnic, and cultural issues, but guidelines lack specific instructions. An article published in the Journal of Counseling & Development provides counselors with strategies for broaching and discussing topics of race, ethnicity, and culture with clients. The article describes a model for broaching these issues and explains a series of steps--joining, assessment, preparation, and delivery--involved in using it. "This and other articles serve as the foundation for the next phase in our research on counselor implementation of broaching and its impact on client mental health outcomes," the authors wrote. INFORMATION: ...

How different beliefs and attitudes affect college students' career aspirations

2021-06-09
A study published in Career Development Quarterly has looked at whether beliefs and attitudes influence career aspirations of college students with different genders and sexual orientations. Among 1,129 college students at a midwestern urban university, stronger self-efficacy beliefs--or perceptions about whether a person has the ability to achieve a desired outcome--led both male and lesbian, gay, bisexual, queer, intersex, and questioning (LGBQIQ) students to seek out leadership positions within their chosen career field. Stronger feminist attitudes were associated with an increase in achievement efforts for LGBQIQ college students, but not for heterosexual students. "The results of the study not only demonstrate that beliefs and attitudes influence ...

Study examines care received by patients with knee osteoarthritis

2021-06-09
New research reveals that only a minority of U.S. Medicare beneficiaries with knee osteoarthritis in 2005-2010 used non-surgical care such as physical therapy and knee injections, and few were treated by rheumatologists, physiatrists, or pain specialists. The study, which is published in END ...

Filipino-Americans: Vitamin D binding protein in thyroid cancer health disparities

Filipino-Americans: Vitamin D binding protein in thyroid cancer health disparities
2021-06-09
Oncotarget published "Differential expression of Vitamin D binding protein in thyroid cancer health disparities" which reported that thyroid cancer incidence, recurrence, and death rates are higher among Filipino Americans than European Americans. In this study, the authors determined the correlation between differential DBP expression in tumor tissues and cancer staging in Filipino Americans versus European Americans. The majority of Filipino Americans presented with advanced tumor staging. In contrast, European Americans showed early staging and very few advanced tumors. On the contrary, in the tumor tissues derived from European Americans, moderate to strong DBP staining was detected ...

LAST 30 PRESS RELEASES:

Look to the data, not the marketing: Turfgrass research shows no differences in ‘penetrant’ and ‘retainer’ wetting agents

New organ recovery technique could make more heart transplants available

NCSA supporting Georgia Tech in new AI venture

Revised, more accurate Baltic ringed seal count – Hunting slows population growth

Eight babies born after Mitochondrial Donation treatment to reduce transmission of mitochondrial DNA disease

Music may reduce distress for dementia patients

The American Ornithological Society announces its 2025 research grantees

Fetal exposure to vape liquids linked to changes in skull shape

Did a meteor impact trigger a landslide in the Grand Canyon?

Study suggests some maternal HIV infections may be missed during pregnancy

Bacterial genomes hold clues for creating personalized probiotics

Rice University scientists discover way to engineer stronger soft devices through smarter silicone bonding

Innovation Crossroads welcomes six entrepreneurs for Cohort 2025

Researchers explore ways to better safeguard romaine supply

Spider’s visual trickery can fool AI

During pregnancy, are newer antiseizure medications safer than older drugs?

Do race and ethnicity play a role in a person’s risk of peripheral neuropathy?

Older adults who increased their regular walking pace by just 14 steps per minute were more likely to experience clinically significant improvements in a test of aerobic capacity and walking endurance

For adults with hearing loss, linear amplification (amplification across all sound levels, available with some hearing aids) might restore their ability to recognize emotion in voices

Self-reporting climate anxiety in the United States is linked to being young, female, believing climate change will impact you personally, and more frequent media and community discussions around clim

A “silent epidemic” of stimulant use is shadowing the most recent opioid epidemic

Food insecurity causes anxiety and depression

New approach to kidney transplant matching could lead to better long-term outcomes

The patterns of elites who conceal their assets offshore

Elephant robot demonstrates bioinspired 3D printing technology

Walking slightly faster could help older adults stay fit

Private health industry lobby group uses marketing and publicity strategies similar to Big Tobacco and other unhealthy commodity industry groups

Government rollbacks of climate monitoring is a public health emergency

Robots that grow by consuming other robots

MD Anderson Research Highlights for July 16, 2025

[Press-News.org] Achieving UV nonlinearity with a wide bandgap semiconductor waveguide