CC BY
3*
ALT'23 The 30th International Conference on Advanced Laser Technologies
LD-I-3
Nonlinear light generation and emission control in nanophotonic structures combined with 2D materials
A.S. Shorokhov1
1- Faculty of Physics, Lomonosov Moscow State University, Moscow 119991, Russia
Recently introduced Mie-resonant nanophotonics based on specially designed subwavelength dielectric or semiconductor particles has been proved to be a versatile tool both for flat optics and integrated photonics [1-3]. Combining such structures with 2D materials one can bring about functionality not available for such systems before [4]. Particularly, it has been shown that integrating monolayers of transition metal dichalcogenides (TMD) with high-Q resonant metasurfaces [5] it is possible to achieve efficient second-harmonic generation in such structures [6]. However, the interplay between optical resonances of the nanoantennas and intrinsic excitonic resonances of 2D materials [7] has not been systematically studied yet. In this work two different studies of Mie-resonant nanophotonic structures integrated with 2D materials are presented. The first one considers a high-Q resonant metasurface combined with a monolayer TMD film. The metasurface comprises a set of TiO2 nanodisks arranged in a tightly spaced quadratic lattice on a silica substrate. MoSe2 monolayer is transferred on top of the nanostructure by the mechanical exfoliation technique. Experimental SHG characterization conducted at room and cryogenic temperatures reveals nontrivial interplay between volumetric (associated with the metasurface) and material (associated with the TMD film) resonances in the structure leading to the multifold increase of the observed nonlinear effect. The second study considers integrated silicon waveguides composed of resonant nanoparticles and thin films of 2D materials. We demonstrate that excitation of magnetic Mie-type resonances in such waveguide chains of Si nanoparticles can increase on-chip light coupling efficiency for localized dipole sources in thin InSe films [8]. Particularly, we experimentally observe up to 2 times improvement in comparison with conventional silicon waveguides. Finally, we investigate a resonant waveguide system composed of SiN nanoparticles for effective optical coupling with localized interlayer exciton emitters in vertically stacked monolayer MoSe2-WSe2 heterostructures [9]. Numerically we demonstrate up to 8 times radiation coupling efficiency improvement and up to 12 times Purcell effect enhancement in comparison with the conventional silicon strip waveguide. Achieved results can be beneficial for development of on-chip light sources.
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[2] R. Bakker et al., "Resonant Light Guiding Along a Chain of Silicon Nanoparticles", Nano Lett., 17, 3458-3464 (2017).
[3] Y. Sirmaci et al., "All-dielectric Huygens' meta-waveguides for resonant integrated photonics", Laser Photonics Rev., 17, 2200860 (2023).
[4] R. Mupparapu et al., "Integration of two-dimensional transition metal dichalcogenides with Mie-resonant dielectric nanostructures", Adv. Phys.: X, 5, 1734083 (2020).
[5] K. Koshelev et al., "Asymmetric Metasurfaces with High-Q Resonances Governed by Bound States in the Continuum", Phys. Rev. Lett., 121, 193903 (2018).
[6] N. Bernhardt et al., "Quasi-BIC Resonant Enhancement of Second-Harmonic Generation in WS2 Monolayers", Nano Lett., 20, 5309-5314 (2020).
[7] G. Wang et al., "Giant Enhancement of the Optical Second-Harmonic Emission of WSe2 Monolayers by Laser Excitation at Exciton Resonances", Phys. Rev. Lett., 114, 097403 (2015).
[8] A. Gartman et al., "Efficient integration of single-photon emitters in thin InSe films into resonance silicon waveguides", JETP Lett., 112, 693-698 (2020).
[9] A. Gartman et al., "Efficient Light Coupling and Purcell Effect Enhancement for Interlayer Exciton Emitters in 2D Heterostructures Combined with SiN Nanoparticles", Nanomaterials, 13, 1821 (2023).
