Vertical beaming of wavelength-scale photonic crystal resonators

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We report that > 80% of the photons generated inside a photonic crystal slab resonator can be funneled within a small divergence angle of +/- 30 degrees. The far-field radiation properties of a photonic crystal slab resonant mode are modified by tuning the cavity geometry and by placing a reflector below the cavity. The former method directly shapes the near-field distribution so as to achieve directional and linearly polarized far-field patterns. The latter modification takes advantage of the interference effect between the original waves and the reflected waves to enhance the energy directionality. We find that, regardless of the slab thickness, the optimum distance between the slab and the reflector closely equals one wavelength of the resonance under consideration. We have also discussed an efficient far-field simulation algorithm based on the finite-difference time-domain method and the near- to far-field transformation.
Publisher
AMER PHYSICAL SOC
Issue Date
2006-06
Language
English
Article Type
Article
Keywords

SPONTANEOUS EMISSION RATE; CHANNEL DROP FILTER; SINGLE-DEFECT; QUANTUM-DOT; SLAB; MODES; LASERS; MICROCAVITY; DIPOLE; CAVITY

Citation

PHYSICAL REVIEW B, v.73, pp.269 - 276

ISSN
1098-0121
DOI
10.1103/PhysRevB.73.235117
URI
http://hdl.handle.net/10203/20392
Appears in Collection
PH-Journal Papers(저널논문)
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