Nano sized laser not visible to the human eye is developed

Published date : 30 July 2012
Article date : 30 July 2012

The ultra nano device is hailed as a breakthrough for emerging photonic technology for applications ranging from computing to medicine. Scientists from the University of Texas at Austin along with colleagues in Taiwan and China have developed an ultra tiny semiconductor laser which is not even visible to the human eye. The nano laser is regarded as key for the development of faster, smaller and lower energy photon-based technologies which includes highly sensitive biosensors for detecting, treating and studying disease.

Until now, the size and performance of photonic devices have been restricted by the three-dimensional optical diffraction limit; the new laser device operates below this level. The current research paper reports on the first operation of a continuous-wave, low-threshold laser below the 3-D diffraction limit. 

The device is constructed from a gallium nitride nanorod which holds indium gallium nitride. Both alloys are semiconductors used commonly in LEDs. The nanorod is placed on top of a thin insulating layer of silicon that covers a layer of film which is smooth at the atomic level. The sientists have been perfecting the material for over 15 years and it is the smoothness that prevents photonic devices from losing waves of electrons.
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