Volume 90, Number 2, April 2010
|Number of page(s)||5|
|Section||Atomic, Molecular and Optical Physics|
|Published online||19 May 2010|
Metastability and directional emission characteristics of excitons in 1D optical lattices
Institut für Theoretische Physik, Universität Innsbruck - Technikerstrasse 25, A-6020 Innsbruck, Austria, EU
Corresponding author: email@example.com
Accepted: 13 April 2010
The radiative damping rate and light emission pattern of electronic excitons in an infinite one-dimensional chain of atoms strongly deviates from independent atom excitations. Exciton emission in the far field is concentrated in cones centered around the chain. Long-wavelength excitons exhibit superradiance with excitation life time orders of magnitude shorter than a single atom. Short-wavelength excitons show reduced spontaneous emission depending on their polarization and beyond a critical wave number they even can get metastable with zero radiation damping rate. Such meta-stable excitations can propagate and mediate interactions over large distances or store photons in the lattice for a long time. While they cannot be directly optically excited, they can be created and read out via tailored evanescent fields from a nearby structured surface or an optical fiber.
PACS: 37.10.Jk – Atoms in optical lattices / 42.50.-p – Quantum optics / 71.35.-y – Excitons and related phenomena
© EPLA, 2010
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