The first results of a cryogenic optical near field microscope

In the Physics Institute. PN Lebedev received the first results of the near-field optical microscope designed for operation over a very wide temperature range and is intended for use in the development of light and nanoistochnikov nanoinformatiki.


 Photo source:fian-inform.ru

Low-temperature scanning near-field optical microscope, "KrioSBOM101" designed and manufactured in collaboration of two innovative companies, AO KDP and «RTI. Cryomagnetic system ", accredited to the Innovation Center LPI. The microscope is installed in the cryogenic section of FIAN and is designed to study the topology and optical properties of nanostructures in a wide range of temperatures, which are conducted under the direction of Dr. Sci. Eugene Science Demikhova.

To solve the problem of information transmission in nanostructures, a key role is played by the creation nanoistochnikov light and ways of communication with their use. Nanoistochniki light are pyramidal structure of semiconductor materials which have the top of the pyramid size of a few atoms. In such objects are formed state quantization conditions typical of the quantum well and there is a possibility of radiation. The size of the emitting region is about 20-50 nm. The main prospect of the use of such sources is to create conditions for the generation, transmission and analysis of information.

To create such structures requires a device that allows you to record radiation with a resolution much higher than the diffraction limit. This satisfies the requirements of a modern near-field scanning optical microscopy (Near-field Scanning Optical Microscopy). In this kind of microscope specimen is scanned in the vicinity of the aperture or dipole with resolution determined by the diameter of the aperture on the end of the optical waveguide probe, the size of the quantum dots or the radius of curvature of the tip of the metal probe.

The resolution of the microscope "KrioSBOM101" — 30-50 nm, temperature range, which is designed device is 1,8-300 K. cryogenic system of the microscope is designed to work with liquid helium or nitrogen, and cryostat equipped with a capacity of 3.5 liters. The device has a maximum scanning equal to 15×15 mm. The diameter of the shaft — 60 mm diameter helium windows (4 pcs.) — 20 mm.

A key part of the microscope is an optical sensor that is supported at a distance of <1 nm above the sample. In operation, the particular challenge is the problem of making z-progress, providing supply and drainage of the probe to the sample. The problem was solved, and the technical innovation was the use of a new type of piezoelectric ceramics, allowed to make a compact, rigid z-progress, capable of reliably move relatively massive probe under cryogenic temperatures.
The main advantage of the device is the possibility of optical resolution, greatly exceeding the Rayleigh criterion, in all the stated temperature range. Due to the AFM microscope mode allows you to explore not only the optical properties, but also the topology of the objects of study. The device is designed for research laboratories.

Commented Eugene Demikhov: "The developed device allows you to make a breakthrough in nanophotonics, in particular, we have planned to work on the creation nanoistochnikov light that will allow the establishment of information networks with tremendous speed of information transfer. At the same time there is a new and non-trivial solution to the problem nanooptovolokna. Russia fully here can be a leader, because all the knowledge and the staff we have. Our approach shows the benefits of such a scheme of instrument in which the unique equipment is manufactured to the task. Recently, it became fashionable to buy equipment in the West. For standard applications is good and breakthrough solutions for problems of bad, because does not allow to take the lead. "

In the Russian market counterparts, "KrioSBOM101" No — samples available designed to operate at "normal" temperatures (eg, Integra Solaris NT-MDT, the materials of which have been published repeatedly on sdelanounas). Compared with foreign low temperature devices "KrioSBOM101" has the ability to work in a wide temperature range.

According to the materials of API "LPI-Inform"
08.09.2011

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