Εξειδίκευση τύπου :	Κεφάλαιο σε πρακτικά συνεδρίου
Τίτλος:	Polymeric Optical Metasurfaces by Two-Photon Lithography: Practical Designs for Beam Steering
Δημιουργός/Συγγραφέας:	[EL] Τσιλιπάκος Οδυσσέας[EN] Tsilipakos, Odysseas Perrakis, George Farsari, Maria Kafesaki, Maria
Ημερομηνία:	2024
Γλώσσα:	Αγγλικά
ISBN:	979-8-3503-7349-3
DOI:	10.1109/Metamaterials62190.2024.10703264
Περίληψη:	Metasurfaces have shown immense potential for wave control in diverse frequency regimes ranging from microwaves to the visible. Optical metasurfaces are particularly challenging since materials with low loss and the ability to tightly confine light (high-index dielectrics, plasmonic metals) become limited. In addition, from a practical point of view they require nanofabrication techniques with high resolution and precision. Here, we consider polymer-based optical metasurfaces to be fabricated with two-photon lithography, which is a fast, scalable, and cost-effective nanofabrication technique. We focus on a beam steering scenario in transmission. The principle of operation is based on phase accumulation within short vertical waveguide segments. We start from idealized, perfectly-cylindrical meta-atom shapes and proceed to conical shapes, which exhibit increased mechanical stability, and smooth half-ellipsoid-like structures that are compatible with the voxels of the laser writing process. We show that the adopted realistic meta-atom shapes lead to only a small deterioration of the steering performance and by employing numerical optimization we are able to recover the performance obtained with the idealized ones. Our work aspires to enable high-performance, practical optical metasurfaces taking fabrication limitations and particularities thoroughly into account.
Όνομα εκδήλωσης:	Eighteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials)
Ημ/νία έναρξης εκδήλωσης :	2024-09-09
Ημ/νία λήξης εκδήλωσης :	2024-09-14
Τόπος εκδήλωσης:	Chania, Crete, Greece
Τίτλος πηγής δημοσίευσης:	Eighteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials)
Θεματική Κατηγορία:	[EL] Νανοτεχνολογία[EN] Nanotechnology [EL] Οπτική. Φώς[EN] Optics. Light
Λέξεις-Κλειδιά:	Nanofabrication Beam steering Shape Optical metamaterials Waveguide lasers Laser stability Writing Plasmons Polymers Optical waveguides
Χρηματοδότης:	European Union
Χρηματοδοτικό πρόγραμμα:	Horizon Europe research and innovation programme
Αναγνωριστικό χρηματοδοτικού προγράμματος:	101091644
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://ieeexplore.ieee.org/document/10703264/authors#authors
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο