Related topics: nanoparticles · nanoscale · nanotechnology · molecules · light

Researchers glimpse the inside of a photonic crystal

(—While today's smart phones, tablets, and other small electronic devices rely on electrical data connections, in the future they may use optical connections in order to become even faster and smaller. Photonic ...

Can graphene nanoribbons replace silicon?

( -- "Graphene has been the subject of intense focus and research for a few years now," Philip Kim tells "There are researchers that feel that it is possible that graphene could replace silicon as ...

OLED Tunes its Colors for Sunlight-Style Illumination

( -- Scientists have developed a lighting device that can change its color temperature throughout the day, matching the natural daylight chromaticities produced by the sun. Currently, no other type of lighting ...

Engineering Carbon for Impressive Hydrogen Storage

( -- University of Missouri researchers recently showed how carbon nanostructures can be engineered to become excellent media for hydrogen storage, work that may be important for the advancement of hydrogen-energy ...

page 1 from 46


A nanometre (American spelling: nanometer; symbol nm) (Greek: νάνος, nanos, "dwarf"; μέτρον, metrοn, "unit of measurement") is a unit of length in the metric system, equal to one billionth of a metre (i.e., 10-9 m or one millionth of a millimetre).

It is one of the more often used units for very small lengths, and equals ten Ångström, an internationally recognized non-SI unit of length. It is often associated with the field of nanotechnology and the wavelength of light. Formerly, millimicron (symbol ) was used for the nanometre. The symbol µµ has also been used .

It is also the most common unit used to describe the manufacturing technology used in the semiconductor industry. It is the most common unit to describe the wavelength of light, with visible light falling in the region of 400–700 nm. The data in compact discs is stored as indentations (known as pits) that are approximately 100 nm deep by 500 nm wide. Reading an optical disk requires a laser with a wavelength 4 times the pit depth -- a CD requires a 780 nm wavelength (near infrared) laser, while the shallower pits of a DVD requires a shorter 650 nm wavelength (red) laser, and the even shallower pits of a Blu-ray Disc require a shorter 405 nm wavelength (blue) laser.

This text uses material from Wikipedia, licensed under CC BY-SA