Journal
ACS PHOTONICS
Volume 2, Issue 11, Pages 1524-1531Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.5b00314
Keywords
photonic crystal; liquid crystal; blue phase; band-gap modulation
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Funding
- Ministry of Science and Technology, Taiwan [103-2112-M-110-012-MY3]
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Highly tunable 3D liquid photonic crystals are demonstrated using low-dc-field-driven polymer-stabilized blue-phase liquid crystals. The central wavelength of the photonic band gap can be reversibly shifted to more than 200 nm away from the original position. Besides, by controlling the polymerization-induced morphology variations, the band gap can also be expanded from a bandwidth of around 30 nm to at least 310 nm, the first time a white blue phase is observed. Both types of band-gap modulation, namely, shifting and expansion, can be independently manipulated in any crystal axis without affecting the lattice spacings in the other dimensions. We envision polymer-stabilized blue-phase liquid crystals as a fascinating platform for photonic applications, such as 3D lasers, nonlinear optics, and photonic integrated circuits.
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