Bragg supermirrors and polarization-state-dependent attenuation and amplification

Tom G. MacKay, Vikas Vepachedu, Akhlesh Lakhtakia

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The planewave reflection/transmission characteristics of two nanostructured thin films were investigated numerically. The thin films are: (i) a columnar thin film and (ii) a periodic multilayer whose unit cell consists of two different columnar thin films. The nanocolumns of these thin films were taken to be made from dissipative materials while the intercolumnar regions were filled with an active material. A combination of inverse and forward homogenization formalisms was employed to estimate the constitutive parameters of the thin films. By computing reflectances and transmittances, it was found that the thin films can simultaneously amplify s-polarized incident light and attenuate p-polarized incident light, or vice versa. This polarization-state-dependent attenuation and amplification phenomenon depends upon the angle of incidence and the thickness of the thin film. Furthermore, the periodic multilayer was found to exhibit the Bragg phenomenon in two generally distinct polarization-dependent spectral regimes for incident linearly polarized light. The presence of both dissipative and active materials allows the high reflectance to generally exceed unity for incident light of one linear polarization state but not for incident light of the other polarization state, in their respective Bragg regimes; however, transmittances are low in both Bragg regimes. That is, the chosen periodic multilayer is at best a good Bragg mirror for one linear polarization state and a Bragg supermirror for the other linear polarization state.

Original languageEnglish (US)
Title of host publicationNanostructured Thin Films XI
EditorsTom G. Mackay, Akhlesh Lakhtakia
PublisherSPIE
ISBN (Electronic)9781510620339
DOIs
StatePublished - Jan 1 2018
EventNanostructured Thin Films XI 2018 - San Diego, United States
Duration: Aug 22 2018Aug 23 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10731
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherNanostructured Thin Films XI 2018
CountryUnited States
CitySan Diego
Period8/22/188/23/18

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

MacKay, T. G., Vepachedu, V., & Lakhtakia, A. (2018). Bragg supermirrors and polarization-state-dependent attenuation and amplification. In T. G. Mackay, & A. Lakhtakia (Eds.), Nanostructured Thin Films XI [107310A] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10731). SPIE. https://doi.org/10.1117/12.2319259