Journal
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
Volume 25, Issue 3, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2019.2902915
Keywords
Dispersion-engineering; directional emission; local density of optical states; photonic crystal; high-index contrast grating; metasurface; symmetry breaking; photoluminescence
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Funding
- French National Research Agency (ANR) under the project PICSEL [ANR-15-CE24-0026]
- United States National Science Foundation [ECCS-1408009]
- French National Research Agency (ANR) under the project SNAP-SHOT [ANR-16-CE24-0004]
- Agence Nationale de la Recherche (ANR) [ANR-15-CE24-0026, ANR-16-CE24-0004] Funding Source: Agence Nationale de la Recherche (ANR)
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We present a method to simultaneously engineer the energy-momentum dispersion and the local density of optical states (LDOS). Using vertical symmetry breaking in high-contrast gratings, we enable the mixing of modes with different parities, thus producing hybridized modes with controlled dispersion. By tuning geometric parameters, we control the coupling between Bloch modes, leading to flatband, M- and W-shaped dispersion as well as Dirac dispersion. This dispersion-engineering leads to tailored LDOS and we experimentally demonstrate a two order of magnitude enhancement of photoluminescence from weak emitters- defects in silicon-via optical modes with adjustable angle of emission. This vertical symmetry-breaking method could readily be used in various photonic crystals and metasurfaces devices and opens up a new way to strongly boost light emission on-chip and to steer it to arbitrary directions.
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