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25 April 2024 |
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Experimental Demonstration of Effective Medium Approximation Breakdown in Deeply Subwavelength All-Dielectric Multilayers | | Sergei V. Zhukovsky
; Andrei Andryieuski
; Osamu Takayama
; Evgeniy Shkondin
; Radu Malureanu
; Flemming Jensen
; Andrei V. Lavrinenko
; | | Date: |
26 Jun 2015 | | Abstract: | We experimentally demonstrate the effect of anomalous breakdown of the
effective medium approximation in all-dielectric deeply subwavelength thickness
($d simlambda/160-lambda/30$) multilayers, as recently predicted
theoretically [H.H. Sheinfux et al., Phys. Rev. Lett. 113, 243901 (2014)].
Multilayer stacks are composed of alternating alumina and titania layers
fabricated using atomic layer deposition. For light incident on such
multilayers at angles near the total internal reflection we observe pronounced
differences in the reflectance spectra for structures with 10-nm versus 20-nm
thick layers, as well as for structures with different layers ordering,
contrary to the predictions of the effective medium approximation. The
reflectance difference can reach values up to 0.5, owing to the chosen
geometrical configuration with an additional resonator layer employed for the
enhancement of the effect. Our results are important for the development of new
high-precision multilayer ellipsometry methods and schemes, as well as in a
broad range of sensing applications. | | Source: | arXiv, 1506.8078 | | Services: | Forum | Review | PDF | Favorites | |
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