Spatial and electrical switching of defect modes in a photonic bandgap device with a polymerdispersed liquid crystal defect layer

Po Chang Wu, En Rong Yeh, Victor Ya Zyryanov, Wei Lee*

*Corresponding author for this work

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

This paper investigates the spectral properties of a onedimensional photonic crystal (PC) containing an inhomogeneous polymerdispersed liquid crystal (PDLC) as a defect layer. Experimental results indicate that the voltage-induced reorientation of LC molecules between the light-scattering and transparent states in the PDLC enables the electrical tuning of the transmittance of defect-mode peaks in the spectrum of the PC/PDLC cell. Specifically, owing to the unique configuration of the spatial distribution of LC droplet sizes in the defect layer, a concept concerning the spatial switching in the wavelength of defect modes is proposed. As a result, the PC/PDLC hybrid cell is suggested as a potential element for realizing an electrically tunable and spatially switchable photonic bandgap device, which is polarizer-free and requires no alignment layers in the fabrication process.

Original languageEnglish
Pages (from-to)20278-20283
Number of pages6
JournalOptics Express
Volume22
Issue number17
DOIs
StatePublished - 25 Aug 2014

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