(Press-News.org) The expression "flawless from every angle" is commonly used to characterize a celebrity's appearance. This doesn't simply imply that they appear attractive from a specific viewpoint, but rather that their appeal remains consistent and appealing from various angles and perspectives. Recently, a research team from Pohang University of Science and Technology (POSTECH) has employed metasurface to fabricate angle-dependent holograms with multiple functions, capturing significant interest within the academic community.
A research team comprising Professor Junsuk Rho from the Department of Mechanical Engineering and the Department of Chemical Engineering and PhD candidate Joohoon Kim from the Department of Mechanical Engineering at the POSTECH created metasurface display technology. This technology allows holograms to display multiple images based on the observer's viewing angle. The findings were recently published in Nano Letters, an international journal focusing on nanoscale research and applications.
Objects can appear distinct depending on the viewer's position, a concept that can be harnessed in holographic technology to generate cinematic and realistic 3D holograms presenting different images based on the viewing angle. However, the current challenge lies in controlling light dispersion according to the angle, making the application of nano-optics in this context a complex endeavor.
The team addressed this challenge by leveraging metasurfaces, artificial nanostructures capable of precisely manipulating the characteristics of light. These metasurfaces are incredibly thin and lightweight, approximately one-hundredth the thickness of a human hair, making them promising for applications in miniaturized displays such as virtual and augmented reality devices. Through the use of metasurfaces, the team devised a system that controls light to convey only a specific phase of information at a given angle, resulting in diverse images based on the angle of incidence.
In their experiments, the team's metasurface generated distinct 3D holographic images at angles of both +35˚ and -35˚ for left-circular polarization. Remarkably, the team achieved the production of different images for incident light by using a single metasurface, contingent on the specific polarization. Notably, the holographic display demonstrated an extensive viewing angle of 70 degrees (±35 degrees), enabling observers to perceive the three-dimensional hologram from various directions.
Professor Junsuk Rho who led the research explained, “We have successfully achieved an effective display from diverse angles.” He added, “We anticipate this technology will make significant contributions to the commercialization of technology in virtual and augmented reality displays, encrypted imaging, information storage, and other applications."
The study was conducted with the support from the program of POSCO-POSTECH-RIST Convergence Research Center program, the STEAM Research Program of the National Research Foundation of Korea funded by the Ministry of Science and ICT, and the Alchemist fellowship of the Ministry of Trade, Industry and Energy.
END
Angle-dependent holograms made possible by metasurfaces
2024-02-21
ELSE PRESS RELEASES FROM THIS DATE:
These tiny power converters run on vibrational energy
2024-02-21
University of California San Diego and CEA-Leti scientists have developed a ground-breaking piezoelectric-based DC-DC converter that unifies all power switches onto a single chip to increase power density. This new power topology, which extends beyond existing topologies, blends the advantages of piezoelectric converters with capacitive-based DC-DC converters.
The power converters the team developed are much smaller than the huge, bulky inductors currently used for this role. The devices could eventually be used for any type of DC-DC conversation, ...
Ochsner Health Hospitals accredited as Surgical Review Corporation Centers of Excellence
2024-02-21
NEW ORLEANS, La – Ochsner Medical Center – New Orleans achieved accreditation as a Center of Excellence in Robotic Surgery, and Ochsner Baptist – A Campus of Ochsner Medical Center, inclusive of Ochsner Medical Center and Ochsner Medical Complex- Clearview, received accreditation as a Center of Excellence in Continence Care for Women by SRC (Surgical Review Corporation). This accreditation recognizes Ochsner Health’s commitment to a high standard of quality patient care delivery and safety.
“Robotic ...
$2 million grant from The Roe Green Foundation catalyzes multidisciplinary research building in Uganda
2024-02-21
CLEVELAND--For the past 38 years, Case Western Reserve University (CWRU) and University Hospitals (UH) have worked closely with a variety of institutions in Uganda to advance medical research and education across a range of fields.
Their facilities have remained scattered across the campuses of local partners but now, the collaboration will have a permanent home.
A $2 million gift from The Roe Green Foundation, jointly awarded to CWRU and UH, will advance global health initiatives from each institution and establish a state-of-the-art research hub and gathering ...
SFU researchers develop AI that can understand light in photographs
2024-02-21
Despite significant progress in developing AI systems that can understand the physical world like humans do, researchers have struggled with modelling a certain aspect of our visual system: the perception of light.
“Determining the influence of light in a given photograph is a bit like trying to separate the ingredients out of an already baked cake.” explains Chris Careaga, a PhD student in the Computational Photography Lab at SFU. The task requires undoing the complicated interactions between light and surfaces in a scene. This problem is referred to as intrinsic decomposition, and has been ...
Minority ethnic NHS staff more likely to face workplace discrimination during pandemic than White colleagues
2024-02-21
Minority ethnic NHS staff were more likely to face workplace harassment, discrimination, and unavailability of personal protective equipment (PPE) than their White British colleagues during the pandemic, reveals research published online in the journal Occupational & Environmental Medicine.
Urgent action is needed to redress ongoing race inequalities in the health service, insist the researchers, who call for the inclusion of diversity and inclusion training in professional development, and the expansion of the NHS Workforce Race Equality Standard.
Staff from minority ethnic groups make up nearly ...
J-shaped curve apparent between dietary thiamine and worsening mental acuity
2024-02-21
There seems to be a J-shaped curve between dietary thiamine (vitamin B1) and worsening mental acuity among cognitively healthy older people, suggests research published in the open access journal General Psychiatry.
The sweet spot seems to be a daily intake of 0.68 mg, below which there is relatively little impact. But higher daily intake was strongly associated with cognitive decline, with the optimal maintenance dose 0.6 to less than 1 mg/day, the findings show.
Thiamine is an essential water-soluble B vitamin involved in energy metabolism and brain neurotransmitter activity. Good dietary sources include whole grains, fortified ...
Adopting healthy lifestyle strongly linked to lower irritable bowel syndrome risk
2024-02-21
Adopting a healthy lifestyle is strongly linked to a lower risk of irritable bowel syndrome or IBS for short, finds research published online in the journal Gut.
Of the big 5 healthy behaviours, not smoking, a high level of vigorous physical activity, and getting enough sleep were independently associated with keeping the condition at bay.
Characterised by abdominal pain, bloating, and abnormal bowel habit, IBS is thought to affect up to 1 in 10 people worldwide. Exactly what causes IBS isn’t fully understood, but disordered functioning of the gut–brain ...
Avid appetite in childhood linked to later eating disorder symptoms
2024-02-21
An enthusiastic response to food in early childhood may be linked to a higher likelihood of experiencing eating disorder symptoms in adolescence, according to a new study led by researchers at UCL and Erasmus University Rotterdam.
The study, published in The Lancet Child & Adolescent Health, looked at survey data from 3,670 young people in the UK and the Netherlands to investigate how appetite traits in early childhood might relate to the likelihood of developing eating disorder symptoms up to 10 years later.
The researchers found that a particularly high food responsiveness, defined as the urge to eat when you see, smell ...
Red light can reduce blood glucose levels, says study
2024-02-21
The researchers found that 670 nanometres (nm) of red light stimulated energy production within mitochondria, the tiny powerhouses within cells, leading to increased consumption of glucose. In particular, it led to a 27.7% reduction in blood glucose levels following glucose intake, and it reduced maximum glucose spiking by 7.5%.
While the study was conducted in healthy individuals, the non-invasive, non-pharmacological technique has the potential to have an impact on diabetes control after meals, as it can reduce damaging fluctuations of blood glucose in the body that contribute to ageing.
The study also highlights the significant long-term consequences for human health, including ...
UT-Battelle donates $186,000 to support SEEED’s green construction program
2024-02-21
Oak Ridge National Laboratory’s managing contractor, UT-Battelle, presented a donation of $186,000 to Socially Equal Energy Efficient Development, or SEEED, to support the nonprofit’s third green solar home as part of their Green Construction Program.
“We are committed to serving the communities that we live in,” UT-Battelle CEO and ORNL Director Stephen Streiffer said. “Our partnership with SEEED has provided a tremendous opportunity to share our scientific expertise, and we are excited that our support will help make this green solar home become a reality.”
Streiffer joined SEEED for a groundbreaking ceremony in Knoxville, Tenn., at the home project ...