The identification of the lasing mode within a quantum cascade photonic crystal microcavity laser emitting at λ∼8 μm is presented. The symmetry of the lasing mode is determined by the position of nodal lines within micro-bolometer camera measurements of its polarized spatial distribution. Full three-dimensional finite-difference time-domain simulations are also performed, and the resulting vertically emitted radiation field pattern is seen to follow the experimental results closely.
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Srinivasan et al. (2004) studied this question.
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