Liquid-crystal-based magnetically tunable terahertz achromatic quarter-wave plate

Cho Fan Hsieh, Chan Shan Yang, Fang Cih Shih, Ru Pin Pan, Ci Ling Pan

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


Development of the wideband and tunable quasi-optic terahertz (THz) components is in high demand. In this work, we demonstrate a tunable achromatic quarter-wave plate (AQWP) for the THz frequency range. The phase retardation of this device can be set at 90° ± 9° from 0.20 to 0.50 THz. The operation range from 0.20 to 0.50 THz can be tuned to from 0.30 to 0.70 THz by introducing three nematic liquid crystals phase retarders, of which the birefringence can be magnetically tuned. The frequency-dependent phase retardation is in good agreement with theoretical predictions.

Original languageEnglish
Pages (from-to)9933-9940
Number of pages8
JournalOptics Express
Issue number7
Publication statusPublished - 2019 Apr 1

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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