Optical Spectra and Analysis of Triply-Ionized Erbium in Silicon.
Abstract
We present a crystal field analysis of the 2K photoluminescence spectrum of triply-ionized Erbium in single crystal Silicon that is codoped with Nitrogen. The emissions occur in the wavelength region between 1.51 and 1.68 microns, which correspond to optical transitions from the ^4I_13/2 to the ^4I_15/2 multiplet. Our analysis of the photoluminescence data suggests that the Er^3+ ion is incorporated in the lattice with a site symmetry lower than the Td symmetry of the Silicon site. The symmetry is not lowered sufficiently, however, to allow strong electric dipole transitions, which are usually parity forbidden, within the energy states of the 4f shell of Er^3+. By assuming a Hamiltonian that describes the crystal field at the Er^3+ site using D_2d symmetry, we are able to fit the dominant photoluminescence lines to within 1 cm-1 by varying the crystal field parameters, B_km. Using these B_km, we calculated the magnetic dipole transition probabilities between the various Stark-split levels of the ^4I_13/2 and ^4I_15/2 multiplets. The results are in good agreement with the measurements.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1997
- Bibcode:
- 1997APS..MAR.H4152W