Details

Autor(en) / Beteiligte

• Lin, Zin
• Pick, Adi
• Lončar, Marko
• Rodriguez, Alejandro W

Titel

Enhanced Spontaneous Emission at Third-Order Dirac Exceptional Points in Inverse-Designed Photonic Crystals

Ist Teil von

• Physical review letters, 2016-09, Vol.117 (10), p.107402-107402, Article 107402

Ort / Verlag

United States

Erscheinungsjahr

2016

Link zum Volltext

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• We formulate and exploit a computational inverse-design method based on topology optimization to demonstrate photonic crystal structures supporting complex spectral degeneracies. In particular, we discover photonic crystals exhibiting third-order Dirac points formed by the accidental degeneracy of monopolar, dipolar, and quadrupolar modes. We show that, under suitable conditions, these modes can coalesce and form a third-order exceptional point, leading to strong modifications in the spontaneous emission (SE) of emitters, related to the local density of states. We find that SE can be enhanced by a factor of 8 in passive structures, with larger enhancements ∼sqrt[n^{3}] possible at exceptional points of higher order n.