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Multiresonances of quasi-trapped modes in metasurfaces based on nanoparticles of transition metal dichalcogenides

M.Yu. GubinA.V. ShesterikovV.S. VolkovA.V. Prokhorov
Dec 2022
The features of polarization control of multiple multiresonances forquasi-trapped modes excited by synchronization of bianisotropic dipoleresponses in MoS$_2$ disks with a hole are considered. Using the numericalcalculations with analytical multipole analysis, we showed that the presence ofa strong optical anisotropy of MoS$_2$ nanoparticles provides an additionaldegree of freedom and allows to observe several resonances of electric andmagnetic dipoles at once in a narrow spectral range. Based on the simulationresults, we obtained the frequency dependences for the dipole polarizabilitiesof the MoS$_2$ disk with a hole, which allow one to distinguish thecontributions of the nonlocal and bianisotropic dipole responses and possessingseveral features in the near infrared range. Using the polarizability spectraof single nanoparticles and applying the tuning strategy, the design of theMoS$_2$ metasurface supporting three resonances of quasi-trapped modes at oncein a narrow spectral range was developed. One of these resonances correspondsto the telecom wavelength of 1550 nm. The spectrum of light reflection forMoS$_2$ metasurface is characterized by three narrowband dips corresponding tothe wavelengths of the quasi-trapped modes. It was shown that a change in thepolarization of a wave normally incident on the metasurface to orthogonal oneleads to a change in the type of bianisotropic response excited in each MoS$_2$disk and to the excitation of three other features in the reflection spectra ofthe metasurface at wavelengths close to the initial values.