Journal
LIGHT-SCIENCE & APPLICATIONS
Volume 2, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/lsa.2013.40
Keywords
bound state in continuum; embedded eigenvalue; photonic crystal; surface mode
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Funding
- MIT S3TEC Energy Research Frontier Center of the Department of Energy [DE-SC0001299]
- MRSEC Program of the NSF [DMR-0819762]
- Army Research Office through the Institute for Soldier Nanotechnologies [W911NF-07-D0004]
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From detailed numerical calculations, we demonstrate that in simple photonic crystal structures, a discrete number of Bloch surface-localized eigenstates can exist inside the continuum of free-space modes. Coupling to the free space causes the surface modes to leak, but the forward and back-reflected leakage may interfere destructively to create a perfectly bound surface state with zero leakage. We perform analytical temporal coupled-mode theory analysis to show the generality of such phenomenon and its robustness from variations of system parameters. Periodicity, time-reversal invariance, two-fold rotational symmetry and a perfectly reflecting boundary are necessary for these unique states.
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