Abstract
In this paper, we design a microcavity with vertical and in-plane emissions
by applying double hetero-structure with mode-gap confinement in photonic
crystal waveguide. The hetero-structure is formed by modulating the waveguide
width locally by slightly shifting the positions of several nearest air-holes
outward. By numerical calculations, we simulate the basic mode profiles and
quality $(Q)$ factors
of each resonance mode. After optimizing the cavity, high simulated $Q$ factor of 110 000
is obtained. From the well-fabricated devices, we observe the lasing emissions
with $Q$ factor
of 3200 at wavelength of 1593 nm from both vertical and in-plane directions
and address the lasing mode by comparing the measured results with the simulated
ones. From the simulated heat transition behaviors by finite-element method,
we observe the better heat dissipation provided by the waveguide region in
this microcavity. This microcavity laser with locally modulated design could
be potentially served as a light source with less influence on the nearby
components in photonic integrated circuits.
© 2009 IEEE
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