Abstract
We propose efficient unidirectional light emitters, which are enabled by the use of large Purcell effect, defect engineering, and the bottom Bragg reflector. Enhanced spontaneous emission rate enables us to achieve very efficient light sources, in which most of the emitted photons can be funneled into a specific resonant mode of interest. The far-field radiation properties of a photonic crystal resonant mode are modified by tuning the cavity geometry and by placing a reflector below the cavity. As a result, > 80% of the photons generated inside a photonic crystal resonator can be collected from the top, within a small divergence angle of ±30°.
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