Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Quasinormal mode theory for multiresonant metasurfaces with superwavelength periodicity involving two-dimensional materials
Δημιουργός/Συγγραφέας:	Christopoulos, Thomas Nousios, Georgios Kriezis, Emmanouil E. [EL] Τσιλιπάκος Οδυσσέας[EN] Tsilipakos, Odysseas
Ημερομηνία:	2024
Γλώσσα:	Αγγλικά
ISSN:	2469-9950 2469-9969
DOI:	10.1103/PhysRevB.110.245407
Περίληψη:	A multimode framework that can be utilized in the analysis and design of metasurfaces with sub- and superwavelength periodicity involving dielectric, plasmonic, or 2D materials is presented. The numerical tool is based on the concept of quasinormal modes (QNMs), which are used to efficiently reconstruct the structure's electromagnetic response. It is general and can be applied to any non-Hermitian periodic resonant system irrespective of pitch value, incidence angle, frequency regime, material composition, and type of supported resonance, including Fabry-Pérot modes, whispering-gallery modes, localized plasmonic resonances and surface states, lattice resonances, dielectric Mie modes, etc. The framework is employed to study two contemporary metasurface structures involving 2D materials: (i) a graphene-based plasmonic metasurface that supports tightly confined surface plasmons which form Fabry-Pérot resonances and (ii) a dielectric metasurface that supports Mie-like resonances and a bound state in the continuum (BIC), enhanced with a transition-metal dichalcogenide bilayer. The ability of supporting sharp resonances through quasidark or qBIC modes as well as the tuning of their resonant frequency via electrical gating are investigated. In each case, the QNMs are retrieved using a modified finite-element scheme that can handle periodic systems with dispersion. They are then fed to the modal framework to specify the spectral response for the zeroth and higher diffraction orders. The results are validated by comparing against time-harmonic finite-element simulations, showing excellent agreement.
Τίτλος πηγής δημοσίευσης:	Physical Review B
Τόμος/Κεφάλαιο:	110
Τεύχος:	24
Θεματική Κατηγορία:	[EL] Οπτική. Φώς[EN] Optics. Light [EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
Λέξεις-Κλειδιά:	bound states in the continuum metasurfaces nanophotonics plasmonics graphene transition metal dichalcogenides electromagnetic wave theory
EU Grant:	2nd Call for H.F.R.I. Research Projects to support Post-doctoral Researchers
EU Grant identifier:	916, PHOTOSURF
Κάτοχος πνευματικών δικαιωμάτων:	© 2024 American Physical Society
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1103/PhysRevB.110.245407
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο