TY - JOUR
T1 - Ultra-Broadband Tunable Bragg–Berry Optical Vortex Generators of a Circularly Symmetric Chiroptic Structure
AU - Jiang, Shun An
AU - Lai, Chia Chun
AU - Zhang, Yan-song
AU - Lin, Jia De
AU - Lin, Wei Chun
AU - Hsieh, Xiang Lin
AU - Lee, Chia Rong
N1 - Funding Information:
The authors would like to thank the Ministry of Science and Technology of Taiwan (Contract numbers: MOST 109‐2221‐E‐006‐208‐MY3 and MOST 109‐2112‐M‐006‐014‐MY3) for financially supporting this research.
Publisher Copyright:
© 2021 Wiley-VCH GmbH
PY - 2021/10/18
Y1 - 2021/10/18
N2 - 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.
AB - 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.
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U2 - 10.1002/adom.202100746
DO - 10.1002/adom.202100746
M3 - Article
AN - SCOPUS:85110679809
SN - 2195-1071
VL - 9
JO - Advanced Optical Materials
JF - Advanced Optical Materials
IS - 20
M1 - 2100746
ER -