Applications of Tekhnoscan's narrow-line lasers
in nano-science and
Characterisation of semiconductor nano-particles possessing quantum-dimension
properties (quantum wells,
dots, and threads) with respect to their optical
parameters is now one of important problems within the industry of new
materials and nano-systems. These quantum nano-structures have quasi-atomic
energy spectra, which depend on their size and composition. For instance,
typical absorption line widths in isolated quantum dots amount to 0.05-0.1 meV
(0.4-0.8 cm-1), corresponding to 12.1-24.2 GHz. In order to study and identify
quantum structures with the use of spectral methods it is most desirable to
use lasers with tuneable output wavelength and the line width at least by an
order of magnitude narrower than typical absorption lines in these structures.
Informative absorption spectra of nano-structures may be located in UV, visible,
as well as in IR ranges. Because of this, in spectral methods of contemporary
nano-technologies the most required laser sources are those providing
ultra-wide detuning range (from UV to IR) and having output line width
around 1-2 GHz.
Parameters and generation modes of computer-controlled tuneable
laser system "T&D-scan" developed and
manufactured by Tekhnoscan are the best fit for laser-optical characterisation
of quantum dot properties. The full set of T&D-scan options allows it to cover
a spectral range from 275 to 1100 nm while having the output line width around
0.5-1 GHz. The spectrometer includes a built-in high-precision radiation
wavelength meter and a system of automatic control over the spectrally
selective laser elements, thus providing the possibility to automatically set
the output radiation wavelength to the absolute precision of 1 GHz (0.004 meV,
or 0.03 cm-1) and to perform continuous scanning of the output radiation line
in a specified spectral range. Laser system "T&D-scan" also has functions and
modules for multi-channel data acquisition and additional channels for
computer control, bringing it to the level of fully functional laser-optical
workstation for a scientist or nano-technologist.
<< Laser Applications in nano-science and nano-technologies.