Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Lasing in strongly resonant metasurfaces with fluorescent dyes: quasi-dark and bright optical states and the reabsorption effect
Δημιουργός/Συγγραφέας:	Nousios, Georgios [EL] Τσιλιπάκος, Οδυσσέας[EN] Tsilipakos, Odysseas Christopoulos, Thomas Algorri, Jose F. Fuscaldo, Walter Dell’Olio, Francesco Kriezis, Emmanouil E. Zografopoulos, Dimitrios C.
Ημερομηνία:	2026
Γλώσσα:	Αγγλικά
ISSN:	1094-4087
DOI:	10.1364/OE.585914
Περίληψη:	A light-emitting metasurface for highly efficient lasing in the visible is proposed and thoroughly theoretically studied. The metasurface comprises split-square slots etched in a thin TiO2 layer and periodically arrayed in a subdiffractive lattice. The slots are filled with highly fluorescent rhodamine 6G (R6G) molecules in a methanol matrix, providing optically pumped gain under pulsed excitation. Lasing is enabled by a slot-type quasi-bound state in the continuum (qBIC) offering enhanced light-matter interaction. Through a meticulous design process, the lasing threshold is minimized by mitigating reabsorption losses and effectively coupling the pump light to a bright mode exhibiting significant angular dispersion. This enables relaxed resonant pumping conditions at the desired wavelength by appropriately choosing the incidence angle. To assess the lasing response, a rigorous temporal coupled-mode theory (CMT) framework is employed, which is adapted to organic dye gain media accounting for the critical reabsorption effect. The proposed metasurface laser has a very low lasing threshold of 1 kW/cm2 and remarkably high efficiency of 15% at 570 nm.
Τίτλος πηγής δημοσίευσης:	Optics Express
Τόμος/Κεφάλαιο:	34
Τεύχος:	20
Θεματική Κατηγορία:	[EL] Εφαρμοσμένη οπτική. Φωτονική[EN] Applied optics. Photonics [EL] Νανοτεχνολογία[EN] Nanotechnology
Λέξεις-Κλειδιά:	metasurfaces fluorescent dyes reabsorption effect low-threshold lasing resonant pumping
Χρηματοδότης:	Italian Ministry of University and Research
Χρηματοδοτικό πρόγραμμα:	PRIN-2022
Αναγνωριστικό χρηματοδοτικού προγράμματος:	D53D23001060006
Κάτοχος πνευματικών δικαιωμάτων:	© 2026 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1364/OE.585914
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο