Brandt, JuliaJuliaBrandtDittrich, GuidoGuidoDittrichThelen, MarcMarcThelenRenner, HagenHagenRennerHuber, PatrickPatrickHuberEich, ManfredManfredEichPetrov, AlexanderAlexanderPetrov2024-05-302024-05-302024-04-01Optical Materials Express 14 (4): 871-879 (2024-04-01)https://hdl.handle.net/11420/47663The optical properties of dielectric materials with subwavelength cylindrical pores are commonly described by effective medium models. We compare the Maxwell Garnett and the Bruggeman effective medium models for porous silicon with simulations and experiments for the case of polarization orthogonal to the pore axis. The Maxwell Garnett model matches the results of the simulations even up to very high porosities. An experimental study of the effective permittivity of macroporous and mesoporous silicon is conducted by analyzing the Fabry-Pérot oscillations in the long-wavelength limit. These experimental results are also consistent with the Maxwell Garnett model. We advocate using this model for media with cylindrical pores in the future.en2159-393020244871879Optica Publishing Grouphttps://creativecommons.org/licenses/by/4.0/Natural Sciences and Mathematics::530: PhysicsJournal Article10.15480/882.1310810.1364/OME.51612510.15480/882.13108Journal Article