Journal
ACS APPLIED NANO MATERIALS
Volume 2, Issue 9, Pages 5681-5687Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b01198
Keywords
chirality; k-space polarimetry; quantum dot; nanoantennas; polarized luminescence; lattice resonance
Funding
- Air Force Office of Scientific Research [FA9550-16-1-0282]
- National Science Foundation through the National Nano Coordinated Infrastructure Network (NNCI) [EGGS-1542202]
- NSF through the MRSEC program
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We examine the polarization state of photo-luminescence 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.
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