Polarized Emission From Twin Microdisk Photonic Molecules

We investigate the polarization of emission from pairs of coupled whispering-gallery-mode semiconductor microdisks. The finite-difference time-domain method is used to carry out an electromagnetic field profile analysis of four classes of bonding and antibonding modes. For coupled circular microdisk...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 2009-08, Vol.45 (8), p.932-936
Main Authors: Xia Li, Myers, R.C., Mendoza, F.M., Awschalom, D.D., Samarth, N.
Format: Article
Language:English
Subjects:
Bonding
Electromagnetic coupling
Electromagnetic fields
Electromagnetic wave polarization
Emission
Exact sciences and technology
Finite difference method
Finite difference methods
Fundamental areas of phenomenology (including applications)
Laser
Laser optical systems: design and operation
Lasers
Mathematical analysis
Microcavity and microdisk lasers
microdisk
Optical polarization
Optics
photonic molecule
Physics
Polarization
Predictive models
Resonators, cavities, amplifiers, arrays, and rings
Semiconductor lasers
laser diodes
Semiconductors
Simulation
Time domain analysis
Whispering gallery modes
whispering gallery modes (WGMs)
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Summary:We investigate the polarization of emission from pairs of coupled whispering-gallery-mode semiconductor microdisks. The finite-difference time-domain method is used to carry out an electromagnetic field profile analysis of four classes of bonding and antibonding modes. For coupled circular microdisks, our simulations predict distinct in-plane polarization directions for the bonding and antibonding modes, in agreement with experimental measurements. For pairs of elliptical microdisks coupled along either the major or the minor axes, our simulations do not predict any polarized emission. Experimental measurements of elliptical microdisks coupled along the minor axis appear to be consistent with these predictions, with no preferred polarization direction for the bonding and antibonding modes. However, elliptical microdisks coupled along the major axis often show a preferred polarization at 45deg to the major axis, inconsistent with both the simulations and with simple symmetry considerations. This suggests that the polarization characteristics of the emission in elliptical geometries may be very sensitive to extrinsic symmetry-breaking factors such as patterning imperfections.
ISSN:0018-9197
1558-1713
DOI:10.1109/JQE.2009.2015893