TY - JOUR
T1 - Enhanced Spontaneous Emission at Third-Order Dirac Exceptional Points in Inverse-Designed Photonic Crystals
AU - Lin, Zin
AU - Pick, Adi
AU - Lončar, Marko
AU - Rodriguez, Alejandro W.
N1 - Funding Information:
We would like to thank Steven G. Johnson for useful discussions. This work was partially supported by the Air Force Office of Scientific Research under Contract No.FA9550-14-1-0389, by the National Science Foundation under Grant No.DMR-1454836, and by the Princeton Center for Complex Materials, a MRSEC supported by NSF Grant No.DMR 1420541. Z. Lin is supported by the National Science Foundation Graduate Research Fellowship Program under Grant No.DGE1144152.
Publisher Copyright:
© 2016 American Physical Society.
PY - 2016/8/30
Y1 - 2016/8/30
N2 - 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 ∼n3 possible at exceptional points of higher order n.
AB - 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 ∼n3 possible at exceptional points of higher order n.
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U2 - 10.1103/PhysRevLett.117.107402
DO - 10.1103/PhysRevLett.117.107402
M3 - Article
C2 - 27636493
AN - SCOPUS:84988703662
SN - 0031-9007
VL - 117
JO - Physical Review Letters
JF - Physical Review Letters
IS - 10
M1 - 107402
ER -