Multipolar interband absorption in a semiconductor quantum dot II Magnetic dipole enhancement

Jorge R. Zurita-Sánchez, Lukas Novotny
2002 Journal of the Optical Society of America. B, Optical physics  
We derive the magnetic dipole selection rules and the magnetic dipole absorption rate for a spherical semiconductor quantum dot. We find that electric dipole and magnetic dipole transitions are exclusive and therefore can be spectrally distinguished. The magnitudes of electric and magnetic absorption rates are compared for excitation with a strongly focused azimuthally polarized beam. It turns out that spatial optical resolution can be increased by detection of the ratio of magnetic and
more » ... agnetic and electric absorption rates. Resolution is limited only by the purity of the laser mode used for excitation.
doi:10.1364/josab.19.002722 fatcat:dwqnfz6q5fhx5j3l5dakyjqnna