AI Article Synopsis
- Colloidal disk-like and sphere-like MoS nanoantennas, made from interlaced 2D nanosheets, allow for tunable resonance peaks between 500 to 900 nm by changing their size and shape.
- Strong magnetic and electric resonances were confirmed through Mie theory calculations, and the second harmonic generation (SHG) shows a significant enhancement of 52 times for spherical nanoantennas at 400 nm due to two-photon resonance.
- Additionally, hybrid nanoantennas of ReS@Au demonstrate an 8.5 times SHG enhancement, indicating their potential for applications in nonlinear photonics and photochemistry.
Article Abstract
Colloidal disk-like and sphere-like MoS nanoantennas are synthesized. They consist of curly and interlaced 2D nanosheets. The resonance peak of the MoS nanoantennas can be tuned from 500 to 900 nm by adjusting the size and shape. The strong magnetic and electric resonances of the dielectric antennas are revealed by theoretical calculations with Mie theory. The second harmonic generation (SHG) of the exfoliated nanosheets and the synthesized nanodisks and nanospheres is investigated and compared by scanning the excitation laser wavelength. SHG enhancement of 52 fold is observed for the spherical nanoantennas at 400 nm, which is attributed to the nanoantenna-enhanced two-photon resonance excitation of the D exciton of MoS monolayers. Moreover, ReS@Au plasmon-dielectric hybrid nanoantennas are also synthesized. The SHG of Au nanoparticles is enhanced 8.5 times by the coupling of the two types of nanoantennas. This new class of optical nanoantennas consisting of 2D materials and exhibiting unique linear and nonlinear optical responses will bring promising applications ranging from nonlinear photonics to photochemistry.
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| http://dx.doi.org/10.1039/c7nr06293a | DOI Listing |
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