Thu, Feb 23, 2017 | updated 06:14 AM IST

Turns out, 'invisibility cloaks' won't work on muggles

Updated: Jul 06, 2016 11:10 IST

Washington D.C, Jul 6 (ANI): If you were longing for the Harry-Potter invisibility cloak, then it's time you pop your bubble as a recent study has some heart-breaking revelations.

The University of Texas researchers have been able to quantify fundamental physical limitations on the performance of cloaking devices, a technology that allows objects to become invisible or undetectable to electromagnetic waves including radio waves, microwaves, infrared and visible light.

The researchers' theory confirms that it is possible to use cloaks to perfectly hide an object for a specific wavelength, but hiding an object from an illumination containing different wavelengths becomes more challenging as the size of the object increases.

Researchers Andrea Alù and Francesco Monticone created a quantitative framework that now establishes boundaries on the bandwidth capabilities of electromagnetic cloaks for objects of different sizes and composition. As a result, researchers can calculate the expected optimal performance of invisibility devices before designing and developing a specific cloak for an object of interest.

Cloaks are made from artificial materials, called metamaterials, which have special properties enabling a better control of the incoming wave, and can make an object invisible or transparent. The newly established boundaries apply to cloaks made of passive metamaterials, those that do not draw energy from an external power source.

Understanding the bandwidth and size limitations of cloaking is important to assess the potential of cloaking devices for real-world applications such as communication antennas, biomedical devices and military radars, Alù said. The researchers' framework shows that the performance of a passive cloak is largely determined by the size of the object to be hidden compared with the wavelength of the incoming wave, and it quantifies how, for shorter wavelengths, cloaking gets drastically more difficult.

For example, it is possible to cloak a medium-size antenna from radio waves over relatively broad bandwidths for clearer communications, but it is essentially impossible to cloak large objects, such as a human body or a military tank, from visible light waves, which are much shorter than radio waves.

"We have shown that it will not be possible to drastically suppress the light scattering of a tank or an airplane for visible frequencies with currently available techniques based on passive materials," Monticone said. "But for objects comparable in size to the wavelength that excites them (a typical radio-wave antenna, for example, or the tip of some optical microscopy tools), the derived bounds show that you can do something useful, the restrictions become looser, and we can quantify them."

In addition to providing a practical guide for research on cloaking devices, the researchers believe that the proposed framework can help dispel some of the myths that have been developed around cloaking and its potential to make large objects invisible.

The study appears in the journal Optica. (ANI)

Washington D.C. [USA], Feb. 23(ANI): NASA's Spitzer Space Telescope has revealed the first known system of seven Earth-size planets around a single star. Three of these planets are firmly located in the habitable zone, the area around the parent star where a rocky planet is most likely to have liquid water.

Full Story >>

Noida (Uttar Pradesh) [India], Feb.22 (ANI): Germany's Alexander von Humboldt (AvH) Foundation has handed over equipment worth € 20, 000 to Amity University for accelerating research initiatives.

Full Story >>

Washington D.C. (USA), Feb 21 (ANI): The world's first battery to use only hydronium ions as the charge carrier has been been developed by scientists.

Full Story >>

Washington D.C. (USA), Feb. 21 (ANI): According to a new study, Carnegie's Stephen Elardo and Anat Shahar shows that interactions between iron and nickel under the extreme pressures and temperatures similar to a planetary interior can help scientists understand the period in our Solar System's youth when planets were forming and their cores were created.

Full Story >>

Washington D.C. [USA], Feb. 18 (ANI): To boost breeding of endangered poultry breeds, Briton researchers have come up with gene-editing techniques for the rare breeds to use them as surrogates that cannot produce their own chicks.

Full Story >>

Meet 'Bernardbowen'- the new minor planet

Updated: Feb 18, 2017 07:00 IST

Washington D.C. [USA], Feb. 18 (ANI): In a major development, a team of scientists have officially named a minor planet as 'Bernardbowen' that sits in the asteroid belt between Mars and Jupiter.

Full Story >>

New York [USA], Feb. 17 (ANI): NASA has called on the world to help it in the search for the new ninth planet, as anyone from a kindergartener to a 95-year-old, can participate in their new project to find the not-yet-discovered celestial body.

Full Story >>

Washington D.C. [USA], Feb. 9 (ANI): To cut down the number of traffic fatalities, drive less!

Full Story >>

Washington D.C. [USA], Feb. 8 (ANI): According to an international team of astronomers led by researchers from University Of Cambridge, the Magellanic Clouds, the two largest satellite galaxies of the Milky Way, appear to be connected by a bridge stretching across 43,000 light years.

Full Story >>

Washington D.C. [USA], Jan. 25 (ANI): A team of researchers have discovered prehistoric wolf-sized otter fossils with a large head and a powerful jaw, weighing around 100 pounds, in China's Yunnan province.

Full Story >>

Washington D.C. [USA], Jan. 25 (ANI): A study finds that early identification of hearing loss in newborn due to a disease or physical abnormality by birth may help them in better language outcomes as they grow.

Full Story >>

Chennai [India], Jan.14 (ANI-Businesswire India): While "Jallikattu" seems to be the trending topic of discussion in Tamil Nadu at the moment, a silent revolution envisioned by youth icon and late Former President of India, Dr. APJ Abdul Kalam has quietly gained momentum. Ignite-India is a nation-wide innovation platform for student innovators and young entrepreneurs in high schools and colleges. Founded by International swimmer Agnishwar Jayaprakash in 2014, the organization has designed & hosted 96 Regional Innovation Conferences and 3 National Innovation Conferences across 36 cities in India where students competed to showcased their innovative creations. These innovations were judged based on the practicality, creativity & sustainability by technical experts from diverse fields.

Full Story >>

New Delhi [India], Jan. 13 (ANI): New computer simulations have shown that tiny droplets of sulphuric acid resulted in long-lasting cooling, which was a likely contributor to the death of land-living dinosaurs.

Full Story >>

New human organ in digestive system discovered

Updated: Jan 05, 2017 06:27 IST

New Delhi [India], Jan. 5 (ANI): Scientists have discovered what they are calling a new human organ that exists in the digestive system.

Full Story >>

Washington D.C. [USA], January 4 (ANI): Songbirds divorce, pack up and leave and miss their best chances for successful reproduction, courtesy suburban development.

Full Story >>

How do conch shells have such huge variety?

Updated: Jan 04, 2017 05:52 IST

Washington D.C. [USA], January 4 (ANI): Conch shells and its varied shapes and size have always been something that has captivated the eyes of collectors.

Full Story >>

Washington D.C. [USA], Dec. 31 (ANI): A new study finds that despite English being considered the common language of global science, over 30 percent of new scientific reports are published other languages due to which many major findings have been overlooked.

Full Story >>

New Delhi [India], Dec. 29 (ANI): Wake up to a chilly morning and sense a bit of rain!

Full Story >>

Washington D.C. [USA], Dec. 27 (ANI): Researchers in the United States have found that an emotional experience, which persists for over 20 to 30 minutes, can influence how you remember future experiences.

Full Story >>