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We examine the polarization state of photoluminescence of core/shell semiconducting nanocrystals coupled to periodic arrays of gold nanorod dimers. Here, we study the effects of changing the pitch of the periodic array, detuning the light emitter from the resonance of the array, altering the nanocrystal material, introducing a spacer layer, and modulating the refractive index of the underlying substrate on the direction and sign of the degree of circularly polarized photoluminescence emitted from the nanocrystal-metamaterial hybrid system. Angle-resolved measurements using a Fourier-space polarimetry setup show that nanocrystals coupled to the two chiral configurations emit circularly polarized light of opposite handedness at mirror symmetric directions, and each chiral nanorod dimer configuration favors a specific circular polarization. We find that the chiral optical response of the hybrid system is preserved for all the different modifications introduced to the original geometry. This work suggests that a broader range of materials and architectures of nanostructures can be integrated to change the direction and twist the polarization state of the photoluminescence of luminescent films.
Bibliographical noteFunding Information:
This work was supported by the Air Force Office of Scientific Research under Contract FA9550-16-1-0282. The authors acknowledge the Minnesota Supercomputing Institute (MSI) at the University of Minnesota for providing resources that contributed to the research results reported within this letter. Portions of this work were conducted in the Minnesota Nano Center, which is supported by the National Science Foundation through the National Nano Coordinated Infrastructure Network (NNCI) under Award ECCS-1542202. Parts of this work were performed in the Characterization Facility, University of Minnesota, which receives partial support from NSF through the MRSEC program. The authors acknowledge Dr. Sang Hyun Oh and Dr. Daehan Yoo for fruitful discussions and assistance in the transmission measurements. The authors also acknowledge Ian M. Slauch for assistance with the deposition of the SixNy film.
© 2019 American Chemical Society.
- k-space polarimetry
- lattice resonance
- polarized luminescence
- quantum dot
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Reporting period for MRSEC
- Period 7