Światłowody 10 tys. razy cieńsze od ludzkiego w...

[Gość: mamma]

Osobiscie to wole artykuly naukowe typu "papierosy dobre na
pamiec". www.tajnedokumenty.com/zagorski/

o rany, znowu ta wariatka...

[Gość: piotr.ny]

daj kiedys link do Paris, Pameli, albo Electry, a nie ciagle
zagorski i zagorski. Zakochalas sie ?

Mammie po prostu ktoś za to płaci...

[Gość: gary]

Decy, centy, mili, mikro...

[Gość: Jagnieszka]

...nano, piko, femto, atto.
Wszystko można przeliczyć na wszystko, ale jednostką w SI jest
metr, nie milimetr. Nanometry zatem, to - lepiej - miliardowe
części metra.

[Gość: jantsp]

a komu chce sie pamietac te nazwy i to w dodatku sciagniete od Grekow - teraz sa
juz jak mamrotanie zaklec. Proponuje przejsc na zapis 10ex-3, 10ex-6, 10 ex-9
itp. Proste i elegenckie i latwiej sie szacuje co jest wieksze co niejsze i ile
razy.
Wesolych Swiat i tak dalej ... jantsp

[meteorr]

Szkoda, Piocu, ze zrywasz z tradycja podawania tekstow zrodlowych...

A swoja droga - ciekawe, jak taki swiatlowod zachowuje sie na zgieciach.

I czy technologie mozna wykorzystac do wszystkich swiatlowodow - tych skokowych
i gradientowych.

I czy w sytuacji fali dluzszej niz srednica nosnika nie pojawiaja sie jakies
nowe zjawiska...

[Gość: pioc]

Źrodłem jest 'Nature” z 21 grudnia.

Oto wstęp artykułu:

”Silica waveguides with diameters larger than the wavelength of
transmitted light are widely used in optical communications,
sensors and other applications. Minimizing the width of the
waveguides is desirable for photonic device applications, but the
fabrication of low-loss optical waveguides with subwavelength
diameters remains challenging because of strict requirements on
surface roughness and diameter uniformity. Here we report
the fabrication of subwavelength-diameter silica ‘wires’ for use as
low-loss optical waveguides within the visible to near-infrared
spectral range. We use a two-step drawing process to fabricate
long free-standing silicawires with diameters down to 50 nmthat
show surface smoothness at the atomic level together with
uniformity of diameter. Light can be launched into these wires
by optical evanescent coupling. The wires allow single-mode
operation, and have an optical loss of less than 0.1 dBmm^-1.
We believe that these wires provide promising building blocks for
future microphotonic devices with subwavelength-width
structures.”

A oto fragment na temat ich skręcania:

”Because of the large index contrast between silica and air, silica
SMNWs can be bent sharply without incurring large bending
losses. These results indicate that the silica SMNWs are also suitable for
applications where tight
waveguide bends are desired. Using two probes from a scanning
tunnelling microscope for micromanipulation, we were able to
successfully guide 633-nm wavelength light through a bend with a
5.6-mm radius in a silica wire with a diameter of about 510nm (see
Fig. 4f). As can be seen in the figure, the intensity of scattered light
after the bend is not greatly reduced, indicating that the bending loss
is low. The ability to guide light through sharp bends is especially
useful for miniaturization of photonic devices. Also, with low
bending loss, micro-rings made from these wires (such as the one
shown in Fig. 3a) can be incorporated into photonic devices such as
optical microresonators for optical communication or optical
sensing. For example, we used a 950-nm-diameter SMNW to
make a ring with a 75-mm radius similar to the one shown in
Fig. 3a; preliminary measurements show that the ring has Q factor
of about 1,500 at a wavelength of 1,550 nm.”


pozdr.
pioc