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Excitation enhancement and extraction enhancement with photonic crystals

United States Patent

March 3, 2015
View the Complete Patent at the US Patent & Trademark Office
Disclosed herein is a system for stimulating emission from at least one an emitter, such as a quantum dot or organic molecule, on the surface of a photonic crystal comprising a patterned dielectric substrate. Embodiments of this system include a laser or other source that illuminates the emitter and the photonic crystal, which is characterized by an energy band structure exhibiting a Fano resonance, from a first angle so as to stimulate the emission from the emitter at a second angle. The coupling between the photonic crystal and the emitter may result in spectral and angular enhancement of the emission through excitation and extraction enhancement. These enhancement mechanisms also reduce the emitter's lasing threshold. For instance, these enhancement mechanisms enable lasing of a 100 nm thick layer of diluted organic molecules solution with reduced threshold intensity. This reduction in lasing threshold enables more efficient organic light emitting devices and more sensitive molecular sensing.
Shapira; Ofer (Cambridge, MA), Soljacic; Marin (Belmont, MA), Zhen; Bo (Cambridge, MA), Chua; Song-Liang (Cambridge, MA), Lee; Jeongwon (Boston, MA), Joannopoulos; John (Belmont, MA)
Massachusetts Institute of Technology (Cambridge, MA)
13/ 768,725
February 15, 2013
GOVERNMENT SUPPORT This invention was made with government support under Contract Nos. DE-SC0001299 and DE-FG02-09ER46577 awarded by the Department of Energy, under Contract No. W911NF-07-D-0004 awarded by the Army Research Office and under Grant No. DMR0819762 awarded by the National Science Foundation. The government has certain rights in the invention.