Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

GUIDED MODE RESONANCES FOR ANGULAR AND SPECTRAL FILTERING
Ignas Lukošiūnas^a, Julianija Nikitina^a,b, Darius Gailevičius^a, Lina Grinevičiūtė^a,b, and Kęstutis Staliūnas^a,c,d
^aLaser Research Center, Vilnius University Faculty of Physics, Saulėtekio 10, 10223 Vilnius, Lithuania
^bCenter for Physical Sciences and Technology, Savanorių 231, 02300 Vilnius, Lithuania
^cICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain
^dUPC, Dep. de Fisica, Rambla Sant Nebridi 22, 08222 Terrassa (Barcelona), Spain
Email: ignas.lukosiunas@ff.vu.lt

Received 13 September 2023; accepted 14 September 2023

The development of devices based on compact waveguides is a rapidly evolving field. A unique variation of such devices is the Fano-like resonance dielectric spectral and spatial filtre, made from a dielectric conformal thin film on a surface relief grating. It can be used in a normal (or oblique) angle-of-incidence configuration. This device facilitates directional selectivity, which is useful for transverse-mode cleaning in short optical cavities. It can also be enhanced by using leaky-mode effects to produce even sharper spectral features. However, a perfect spatial filtre should be as invariant as possible in the spectral and enhanced angular domains. Here, we solved the inverse design problem to produce such an effect. Numerically, we tuned the surface profile of the substrate grating, assuming a conformal layer on top. This resulted in trapezoidal relief patterns followed by narrow flat-top angular features. The combination of leaky mode effect and enhanced device topology will enable efficient and useful devices with a bandwidth of 50 nm and even more in the future.
Keywords: nanophotonics, linear photonics, RCWA, Maxwell’s equations, ion beam sputtering

ERDVINIS IR SPEKTRINIS FILTRAVIMAS NAUDOJANT BANGOLAIDINIUS REZONANSUS
Ignas Lukošiūnas^a, Julianija Nikitina^a,b, Darius Gailevičius^a, Lina Grinevičiūtė^a,b, Kęstutis Staliūnas^a,c,d

^aVilniaus universiteto Fizikos fakulteto Lazerinių tyrimų centras, Vilnius, Lietuva
^bFizinių ir technologijos mokslų centras, Vilnius, Lietuva
^cKatalonijos mokslinių tyrimų ir pažangiųjų studijų institutas (ICREA), Barselona, Ispanija
^dKatalonijos politechnikos universiteto (UPC) Fizikos fakultetas, Terasa (Barselona), Ispanija

Nanofotonika yra sparčiai besivystanti sritis, kurioje nagrinėjama šviesos sąveika su įvairiomis, tarp jų ir bangolaidinėmis, metamedžiagomis. Vienas ryškiausių pavyzdžių yra Fano rezonansu pasižymintys bangolaidiniai komforminiai plonasluoksniai filtrai, kurie gaminami ant periodinių paviršių gardelių pagrindo naudojant jonapluoščio dulkinimo (angl. Ion Beam Sputtering) technologiją. Šiais fotoniniais įtaisais galima atlikti erdvinio filtravimo funkciją pasiekus ištekančio (angl. leaky) modų režimo sąlygą. Jais galima naudotis kaip veidrodžiais, kurie siaurai atspindi kritusią šviesą kampinėje ir plačiai spektrinėje srityse. Šiame darbe buvo išspręstas optimizavimo uždavinys tobulinant trapecinės formos periodinį bangolaidį taip, kad būtų gautas aštrus plokščios viršūnės pavidalo atspindys kampiniame diapazone. Jo plotis spektre yra 46 nm. Siekiant įrodyti teorijos validumą, buvo atliktas tokių darinių gamybos eksperimentas ant trapecinės formos gardelių pagrindo.

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