Ultra-Broadband Tunable Bragg–Berry Optical Vortex Generators of a Circularly Symmetric Chiroptic Structure

Shun An Jiang, Chia Chun Lai, Yan-song Zhang, Jia De Lin, Wei Chun Lin, Xiang Lin Hsieh, Chia Rong Lee

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

New optical–photonic devices with the capability to manipulate, modify, and even tailor the light characteristics dynamically, such as wave surface, play an increasingly important role in the development of modern and future optics. Optical vortex with spiral wave surfaces is a special type of light with intrinsic orbital angular momentum (OAM). Thus, this vortex can be applied to the development of advanced optics, such as optical tweezers, ultra-resolution microscope, optical communication, and quantum technology. This study demonstrates an optical device known as Bragg–Berry optical vortex generator (BBOVG) with a circularly symmetric chiral photonic structure using an easy-to-implement method by filling a ferroelectric liquid crystal-doped cholesteric liquid crystal (FLC-CLC) material into an indium-tin-oxide-coated cell pre-treated with photoalignment along the azimuthal direction. The BBOVG devices can be operated by dynamically tuning the photonic bandgaps of the opposite-handed FLC-CLCs throughout the full-visible region (400–700 nm) in a low voltage range (≤ 3.0 V) to obtain reflective optical vortices with opposite OAM signs in a full-visible range near room temperature. The present devices, which can transform geometric phase and have ultra-wideband manipulability and high operability at room temperature, provide a good example in demonstrating key devices that fit the use in future optical/photonic applications.

Original languageEnglish
Article number2100746
JournalAdvanced Optical Materials
Volume9
Issue number20
DOIs
Publication statusPublished - 2021 Oct 18

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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