Abstract
The vertical leakage characteristics are investigated for
whispering-gallery modes (WGMs) in the microcylinder resonators with
vertical semiconductor waveguiding. The mode coupling between HE and EH
modes at the boundaries between the core and cladding layers results in a
vertical leakage loss for the WGMs, if the transformed modes can propagate
in the cladding layer. The core-layer-thickness-dependent vertical leakage
loss caused by the internal interference is demonstrated and numerical
simulated for the WGMs by the finite-difference time-domain (FDTD)
technique. An oscillation of mode <i>Q</i> factor is found with the increase
of the thickness of core layer due to the internal interference between the
transmitted and reflected leakage modes, and the vertical leakage loss can
be canceled at some thicknesses of the core layer because of the destructive
interference. Furthermore, the vertical leakage loss can also be controlled
by the external interference in the microcylinder resonator with two
vertical coupled core layers. The enhancements of <i>Q</i> factors for both symmetric and antisymmetric modes are observed
by varying the gap between the two core layers.
© 2011 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription