Bragg supermirror with polarization-dependent amplification of reflected light

Vikas Vepachedu, Tom G. Mackay, Akhlesh Lakhtakia

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Reflection and transmission of light by a periodic multilayer, with a unit cell consisting of two different columnar thin films (CTFs), was numerically investigated. The nanocolumns of the CTFs were taken to be made from dissipative materials with the intercolumnar void regions filled with an active material. A combination of inverse and forward homogenization formalisms was employed to estimate the constitutive parameters of the two CTFs. The periodic multilayer exhibits 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, but transmittances are low in both Bragg regimes. Thus, the chosen periodic multilayer is at best a good Bragg mirror for one linear polarization state, but it is a Bragg supermirror for the other linear polarization state.

Original languageEnglish (US)
Pages (from-to)58-63
Number of pages6
JournalOptics Communications
Volume425
DOIs
StatePublished - Oct 15 2018

Fingerprint

linear polarization
Amplification
Polarization
polarization
thin films
Multilayers
Thin films
Bragg reflectors
homogenizing
polarized light
voids
unity
transmittance
Wave transmission
reflectance
Light polarization
estimates
cells
Mirrors

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

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title = "Bragg supermirror with polarization-dependent amplification of reflected light",
abstract = "Reflection and transmission of light by a periodic multilayer, with a unit cell consisting of two different columnar thin films (CTFs), was numerically investigated. The nanocolumns of the CTFs were taken to be made from dissipative materials with the intercolumnar void regions filled with an active material. A combination of inverse and forward homogenization formalisms was employed to estimate the constitutive parameters of the two CTFs. The periodic multilayer exhibits 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, but transmittances are low in both Bragg regimes. Thus, the chosen periodic multilayer is at best a good Bragg mirror for one linear polarization state, but it is a Bragg supermirror for the other linear polarization state.",
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Bragg supermirror with polarization-dependent amplification of reflected light. / Vepachedu, Vikas; Mackay, Tom G.; Lakhtakia, Akhlesh.

In: Optics Communications, Vol. 425, 15.10.2018, p. 58-63.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Bragg supermirror with polarization-dependent amplification of reflected light

AU - Vepachedu, Vikas

AU - Mackay, Tom G.

AU - Lakhtakia, Akhlesh

PY - 2018/10/15

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N2 - Reflection and transmission of light by a periodic multilayer, with a unit cell consisting of two different columnar thin films (CTFs), was numerically investigated. The nanocolumns of the CTFs were taken to be made from dissipative materials with the intercolumnar void regions filled with an active material. A combination of inverse and forward homogenization formalisms was employed to estimate the constitutive parameters of the two CTFs. The periodic multilayer exhibits 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, but transmittances are low in both Bragg regimes. Thus, the chosen periodic multilayer is at best a good Bragg mirror for one linear polarization state, but it is a Bragg supermirror for the other linear polarization state.

AB - Reflection and transmission of light by a periodic multilayer, with a unit cell consisting of two different columnar thin films (CTFs), was numerically investigated. The nanocolumns of the CTFs were taken to be made from dissipative materials with the intercolumnar void regions filled with an active material. A combination of inverse and forward homogenization formalisms was employed to estimate the constitutive parameters of the two CTFs. The periodic multilayer exhibits 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, but transmittances are low in both Bragg regimes. Thus, the chosen periodic multilayer is at best a good Bragg mirror for one linear polarization state, but it is a Bragg supermirror for the other linear polarization state.

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