Issue |
Europhys. Lett.
Volume 67, Number 6, September 2004
|
|
---|---|---|
Page(s) | 948 - 954 | |
Section | Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics | |
DOI | https://doi.org/10.1209/epl/i2004-10159-8 | |
Published online | 01 September 2004 |
Giant lasing effect in magnetic nanoconductors
1
Department of Microelectronics and Nanoscience, Chalmers University of Technology SE-412 96 Göteborg, Sweden
2
Department of Applied Physics, Chalmers University of Technology and Göteborg University - SE-412 96 Göteborg, Sweden
3
Theoretische Physik III, Ruhr-Universität Bochum - D-44780 Bochum, Germany
Corresponding author: kadig@tp3.ruhr-uni-bochum.de
Received:
8
April
2004
Accepted:
27
July
2004
We propose a new principle for a compact solid-state laser in the
1–100 regime. This is a frequency range where attempts to
fabricate small-size lasers up to now have met severe technical
problems. The proposed laser is based on a new mechanism for
creating spin-flip processes in ferromagnetic conductors. The
mechanism is due to the interaction of light with conduction
electrons; the interaction strength, being proportional to the
large exchange energy, exceeds the Zeeman interaction by orders of
magnitude. On the basis of this interaction, a giant lasing
effect is predicted in a system where a population inversion has
been created by tunneling injection of spin-polarized electrons
from one ferromagnetic conductor to another —the magnetization
of the two ferromagnets having different orientations. Using
experimental data for ferromagnetic manganese perovskites with
nearly 100% spin polarization, we show the laser frequency to be
in the range 1–100
. The optical gain is estimated to be
of order 107
, which exceeds the gain of
conventional semiconductor lasers by 3 or 4 orders of magnitude.
A relevant experimental study is proposed and discussed.
PACS: 42.55.Ah – General laser theory / 42.55.Rz – Doped-insulator lasers and other solid state lasers / 73.63.Rt – Nanoscale contacts
© EDP Sciences, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.