Menarik,
meskipun bukan "real blackhole" melainkan perpect black body. Ngefocus
microwave into the center lalu di konversi
ke thermal energy. Biarpun made in china dan bukan real blackhole, Fisika di
dalamnya cukup interesting dan MENDUNIA.
Terbukti dengan adanya komentar Sir John Pendry, dewanya "metamaterial".
Artikel sebenernya saya tuliskan dibawah ini
diambil dari Nature News (karena lewat subskripsi) .
Dr. M. D. Birowosuto
Complex Photonic Systems
University of Twente
The Netherlands
Researchers create portable black hole
Mini-hole made of metamaterials ensnares microwave light.
Geoff Brumfiel
Q. Cheng and T. J. Cui
Physicists have created a black hole for light that can fit in your coat pocket.
Their device, which measures just 22 centimetres across, can suck up
microwave light and convert it into heat.
The hole is the latest clever device to use 'metamaterials', specially
engineered
materials that can bend light in unusual ways. Previously, scientists
have used such metamaterials to build 'invisibility carpets' and
super-clear lenses. This latest black hole was made by Qiang Chen and
Tie Jun Cui of Southeast University in Nanjing, China, and is described
in a paper on the preprint server ArXiv1.
Black
holes are normally too massive to be carried around. The black hole at
the centre of the Milky Way, for example, has a mass around 3.6 million
times that of the Sun and warps the very space around it. Light that
travels too close to it can become trapped forever.
The new
meta-black hole also bends light, but in a very different way. Rather
than relying on gravity, the black hole uses a series of metallic
'resonators' arranged in 60 concentric circles. The resonators affect
the electric and magnetic fields of a passing light wave, causing it to
bend towards the centre of the hole. It spirals closer and closer to
the black hole's 'core' until it reaches the 20 innermost layers. Those
layers are made of another set of resonators that convert light into
heat. The result: what goes in cannot come out. "The light into the
core is totally absorbed," Cui says.
"I am very impressed," says John Pendry, a theoretical physicist at
Imperial College London. Pendry says that the black hole is yet the
latest example of the many strange devices that can be built with
metamaterials. But, he adds, it is not a perfect black-hole analogy.
The enormous gravity of real black holes causes them to emit an eerie
quantum glow, known as Hawking radiation. "The optical device reported
in this paper has no internal source of energy and therefore cannot
emit Hawking radiation," Pendry says.
Nevertheless, Cui says
that the hole could prove useful. By the end of the year his team hopes
to have a version of the device that will suck up light of optical
frequencies. If it works, it could be used in applications such as
solar cells.
References
1. Cheng, Q. & Cui, T. J. http://arxiv.org/abs/0910.2159v1 (2009).
--- In [email protected], arlandi1...@... wrote:
>
>
> Kalau merknya blusky bisa diskon dong di carrefour?
> :P
>
> Tapi jaman sekarang ini hampir semua merk dirakit di cina. Dari yg kelas
> murahan sampai high end.
> 'Black hole' ini mudah2an termasuk yg kelas atas deh....
> Hahaha
> Emangnya udah masuk glodok apa???
>
>
> http://alturl.com/dg72 http://alturl.com/6hyy
>
> -----Original Message-----
> From: "Thio Agustinus" <thio4mil...@...>
> Date: Fri, 23 Oct 2009 16:47:07
> To: <[email protected]>
> Subject: RE: [Indo-StarTrek] Artificial blackhole
>
>
> >>it's not exactly a blackhole, just something that can completely absorb
> light.
>
> Somehow, karena statusnya "Made in China", gue nggak heran deh....
> Kualitasnya yaa itu, "Made in China" hehehehe
>
> Thio
>
>
>
>
> [Non-text portions of this message have been removed]
>
