Chiral sculptured thin films as circular Bragg supermirrors

Tom G. Mackay; Akhlesh Lakhtakia

doi:10.1117/12.2320201

7 September 2018 Chiral sculptured thin films as circular Bragg supermirrors

Tom G. Mackay, Akhlesh Lakhtakia

Proceedings Volume 10731, Nanostructured Thin Films XI; 107310R (2018) https://doi.org/10.1117/12.2320201
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

The planewave re ection/transmission characteristics of a chiral sculptured thin film (CSTF) were investigated numerically. The helical nanowires of the CSTF were taken to be made from a dissipative material while the void regions between the nanowires were filled with an active material. Theory showed that the CSTF can simultaneously amplify left-circularly-polarized incident light and attenuate right-circularly-polarized incident light, or vice versa depending upon the handedness of the CSTF. The presence of both dissipative and active materials allows the high reflectance to exceed unity for incident light of one circular polarization state across a substantial portion of the circular Bragg spectral regime but not for incident light of the other circular polarization state. That is, the chosen CSTF is a circular Bragg supermirror for one, and only one, circular polarization state.

Citation Download Citation

Tom G. Mackay and Akhlesh Lakhtakia "Chiral sculptured thin films as circular Bragg supermirrors", Proc. SPIE 10731, Nanostructured Thin Films XI, 107310R (7 September 2018); https://doi.org/10.1117/12.2320201

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KEYWORDS

Nanowires

Reflectivity

Thin films

Dielectric polarization

Transmittance

Homogenization

Refractive index

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