Polarization-dependent filters based on chiral photonic structures with defects

Jiun Yeu Chen, Lien-Wen Chen

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A one-dimensional photonic device to perform optical multiple-wavelength filtering for light of a particular circular polarization state is presented and modelled. It is shown that the transmission spectrum of a stacked structure consisting of two cholesteric films with the same pitch gradient in the helix can be tailored by incorporating the defects of pitch jump and phase jump in the middle of the structure. The introduction of the defects results in the exhibition of multiple-band-pass characteristics inside the photonic band gap when incident circularly polarized light has the same handedness as the cholesterics. Some critical parameters are analysed: the thickness of the double-composite film, co-polarized/cross-polarized transmittance and reflectance, and the twist angle. For light of specified circular polarization, the shift of the filter in transmitted wavelength can be tuned linearly by adjusting the amount of the phase jump. The proposed chiral filter may be useful for multichannel lightwave systems. Some rules for the practical implementation of a filter with polarization sensitivity are given.

Original languageEnglish
Pages (from-to)558-566
Number of pages9
JournalJournal of Optics A: Pure and Applied Optics
Volume7
Issue number10
DOIs
Publication statusPublished - 2005 Oct 1

Fingerprint

Circular polarization
Photonics
photonics
Polarization
circular polarization
filters
Photonic band gap
Wavelength
Defects
Photonic devices
defects
Composite films
polarization
Light polarization
handedness
wavelengths
helices
polarized light
transmittance
adjusting

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

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Polarization-dependent filters based on chiral photonic structures with defects. / Chen, Jiun Yeu; Chen, Lien-Wen.

In: Journal of Optics A: Pure and Applied Optics, Vol. 7, No. 10, 01.10.2005, p. 558-566.

Research output: Contribution to journalArticle

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