biostudies-literatureUnknown12(14)Anopchenko AUsing electrodynamical description of the average power absorbed by a conducting film, we present an expression for the electric-field intensity enhancement (FIE) due to epsilon-near-zero (ENZ) polariton modes. We show that FIE reaches a limit in ultrathin ENZ films inverse of second power of ENZ losses. This is illustrated in an exemplary series of aluminum-doped zinc oxide nanolayers grown by atomic layer deposition. Only in a case of unrealistic lossless ENZ films, FIE follows the inverse second power of film thickness predicted by S. Campione, et al. [<i>Phys. Rev. B</i>, vol. 91, no. 12, art. 121408, 2015]. We also predict that FIE could reach values of 100,000 in ultrathin polar semiconductor films. This work is important for establishing the limits of plasmonic field enhancement andNanophotonics (Berlin, Germany)2913-2920https://www.ebi.ac.uk/biostudies/studies/S-EPMC11501972biostudies-literatureField enhancement of epsilon-near-zero modes in realistic ultrathin absorbing films.PMC11501972Gurung SLee HWHBej SAnopchenko AfalseField enhancement of epsilon-near-zero modes in realistic ultrathin absorbing films.Using electrodynamical description of the average power absorbed by a conducting film, we present an expression for the electric-field intensity enhancement (FIE) due to epsilon-near-zero (ENZ) polariton modes. We show that FIE reaches a limit in ultrathin ENZ films inverse of second power of ENZ losses. This is illustrated in an exemplary series of aluminum-doped zinc oxide nanolayers grown by atomic layer deposition. Only in a case of unrealistic lossless ENZ films, FIE follows the inverse second power of film thickness predicted by S. Campione, et al. [<i>Phys. Rev. B</i>, vol. 91, no. 12, art. 121408, 2015]. We also predict that FIE could reach values of 100,000 in ultrathin polar semiconductor films. This work is important for establishing the limits of plasmonic field enhancement and2023-01-01T00:00:00Z2023 Jul2025-04-27T02:16:45.213Z2025-04-06T18:31:07.15ZS-EPMC115019723963549610.1515/nanoph-2022-0816