Electrically and mechanically induced long period gratings in liquid crystal photonic bandgap fibers

Danny Noordegraaf, Lara Scolari, Jesper Lægsgaard, Lars Henning Rindorf, Thomas Tanggaard Alkeskjold

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We demonstrate electrically and mechanically induced long period gratings (LPGs) in a photonic crystal fiber (PCF) filled with a highindex liquid crystal. The presence of the liquid crystal changes the guiding properties of the fiber from an index guiding fiber to a photonic bandgap guiding fiber - a so called liquid crystal photonic bandgap (LCPBG) fiber. Both the strength and resonance wavelength of the gratings are highly tunable. By adjusting the amplitude of the applied electric field, the grating strength can be tuned and by changing the temperature, the resonance wavelength can be tuned as well. Numerical calculations of the higher order modes of the fiber cladding are presented, allowing the resonance wavelengths to be calculated. A high polarization dependent loss of the induced gratings is also observed.
Original languageEnglish
JournalOptics Express
Volume15
Issue number13
Pages (from-to)7901-7912
ISSN1094-4087
DOIs
Publication statusPublished - 2007

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