innovator

Add idea


Calendar

«    March 2019    »
MonTueWedThuFriSatSun
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

 

Advert

 

Payment

 

Advert

 

Authorization

Стартап
DateDate: 10-05-2018, 07:04

A research team from the St. Petersburg National Research University of Information Technology, Mechanics and Optics (ITMO) developed the first of its kind a controlled light source based on a nanoscale diamond crystal. The conducted experiments showed that the presence of a diamond crystal almost doubles the intensity of the light emitted by such a source and allows it to be controlled without the need for additional nanostructures. The key to all this is artificially created defects in the crystal structure of diamond, and this technology can be used to create future quantum computers and communication optical networks.
Studies in the field of modern nanophotonics are conventionally divided into two directions - the creation of active dielectric nanodiamonds and the creation of controlled sources of photons. As a basis for nano-antennas, metallic particles are usually used on the surface of which plasmons actively arise. However, a high level of optical losses and heating of metals during work force scientists to look for alternative options. Therefore, scientists from ITMO have been actively exploring the possibility of using dielectric materials in nanophotonics for some time, they have already successfully created nano-antennas from silicon and Perovski.
Nano-diamonds, due to their tiny sizes, have some amazing properties. The diamond itself has a very high refractive index of light, high thermal conductivity and low chemical activity. And if in artificially create defects in diamonds, called nitrogen vacancies, then such a crystal acquires additional properties. The nitrogen vacancy (Nitrogen-Vacancy, NV) arises at a place where one carbon atom is replaced by a nitrogen atom. The direction of rotation of the remaining free electron is easy to control with the help of light and, therefore, a vacancy can be used as a quantum bit, a qubit capable of storing quantum information.
Scientists from ITMO determined that the level of light radiated by nanodiamond can be increased by combining the luminescence spectrum of the NV center with the frequency of the optical resonance of the nanocrystal itself. This can be achieved by placing a vacancy in a strictly defined place and giving the crystal itself a special form.
"Usually, to enhance the flux of light emitted, a complex system of optical resonators is used," write the researchers. "We managed to get a similar effect without using any additional elements. At the same time, we managed to practically double the speed of controlling the work of a light source, using only the usual laws of physics. "
Scientists conducted their experiments with crystals, in which there were several nitrogen vacancies. But their theoretical calculations have shown that a crystal in which only one nitrogen vacancy will be present will work as a highly efficient and controlled source of single photons, which can become an active element of photonic logic elements and other devices. Taken with dailytechinfo.org





Add comment

Your name:*
Your E-Mail:*
Input code
from the picture*
Enable this picture to display the security code
reload, if the code cannot be seen