Electric Field-Driven Shifting and Expansion of Photonic Band Gaps in 3D Liquid Photonic Crystals

Chen, Chun-Wei; Li, Cheng-Chang; Jau, Hung‐Chang; Yu, Lu-Chun; Hong, Ching-Lang; Guo, Duan-Yi; Wang, Chun-Ta; Lin, Tsung‐Hsien

doi:10.1021/acsphotonics.5b00314

Cited by 63 publications

(37 citation statements)

References 39 publications

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“…Under DC field, the polymer fibrils was pulled toward the cathode, stretching the structure near the anode and compressing the structure near cathode simultaneously, thus bandwidth broadening inevitably can be observed. [15,21a] Distinguishingly here, the electrically responsive behavior is dependent on the polarity of DC bias, indicating the nonhomogenous distribution of inherent polymer properties. [21d] On account of the natural UV absorptivity of liquid crystal constituents, intensity gradient of UV light can occur along the incident direction perpendicular to the substrate .…”

Section: Resultsmentioning

confidence: 91%

“…Moreover, the facile fabrication process enabled the large‐scale production of the 3D RPCs. Remarkably, it has been reported that distributed feedback can be realized in three dimensions of BP system,[13a] as well as the PBG in each dimension of PSBP can be modulated independently of the others by DC field . Thus, the arbitrarily manipulation of the PBG by polarity or intensity of DC field in either dimension is of significant importance to develop 3D tunable laser.…”

Section: Resultsmentioning

confidence: 99%

“…While the narrow BP temperature range (≈6 K) even after photopolymerization may limit their practical applications. Recently, Lin reported electrically induced shift and expansion of the PBG in polymer‐stabilized blue phase X system under DC field . However, the research in this field is still in a preliminary stage, and further investigations are required to elucidate the underlying mechanism and improve the performance.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Asymmetric Tunable Photonic Bandgaps in Self‐Organized 3D Nanostructure of Polymer‐Stabilized Blue Phase I Modulated by Voltage Polarity

Wang

Zou

Sun

et al. 2017

Adv Funct Materials

125

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Electrically responsive photonic crystals represent one of the most promising intelligent materials for technological applications in optoelectronics. In this research, a polymer-stabilized blue phase (PSBP) I film with the self-organized 3D nanostructure is fabricated, and an electrically tunable photonic bandgap (PBG) is achieved. Interestingly, the large-scale shift of the PBG covering the entire visible spectrum is found to be asymmetric and can be modulated by the polarity and magnitude of bias voltage. Moreover, to demonstrate the usability in optical devices, blue phase lasers are developed by doping the PSBP material with fluorescent dyes. And mirrorless lasing emission with electrically tunable wavelength is observed. This self-assembled soft material is prospective to produce large-scale electrically responsive photonic crystals in facile fabrication process and has enormous potential applications in intelligent optoelectronic devices, such as 3D tunable lasers, reflective full-color displays, or photonic integrated circuits.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Asymmetric Tunable Photonic Bandgaps in Self‐Organized 3D Nanostructure of Polymer‐Stabilized Blue Phase I Modulated by Voltage Polarity

Wang

Zou

Sun

et al. 2017

Adv Funct Materials

125

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“…In the past decade, many studies have been devoted to clarify the phase structure of BP, both theoretically and experimentally . Moreover, soft matter features of BPs render them responsive to external stimuli, such as temperature, electric field, and light, resulting in tunable performance of BP‐based photonic devices.…”

mentioning

confidence: 99%

Light‐Patterned Crystallographic Direction of a Self‐Organized 3D Soft Photonic Crystal

et al. 2017

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Uniform and patterned orientation of a crystallographic direction of ordered materials is of fundamental significance and of great interest for electronic and photonic applications. However, such orientation control is generally complicated and challenging with regard to inorganic and organic crystalline materials due to the occurrence of uncontrollable dislocations or defects. Achieving uniform lattice orientation in frustrated liquid-crystalline phases, like cubic blue phases, is a formidable task. Taming and tailoring the ordering of such soft, cubic lattices along predetermined or desired directions, and even imparting a prescribed pattern on lattice orientation, are more challenging, due to the entropy-domination attribute of soft matter. Herein, we disclose a facile way to realize designed micropatterning of a crystallographic direction of a soft, cubic liquid-crystal superstructure, exhibiting an alternate uniform and random orientation of the lattice crystallographic direction enabled by a photoalignment technique. Because of the rewritable trait of the photoalignment film, the pattern can be erased and rewritten on-demand by light. Such an oriented soft lattice sensitively responds to various external stimuli such as temperature, electric field, and light irradiation. Furthermore, advanced reflective photonic applications are achieved based on the patterned crystallographic orientation of the cubic blue phase, soft lattice.

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“…Figure 4 presents the images of the BPLC microlens array, which was placed under crossed polarizers and operated with different voltages at 38.5 °C. When a reasonable voltage is applied to the sample, the BPLC microlens exhibits a color change due to the electrostriction effect [28]. At a voltage of 50 V, the effective electric field at the edge of the microlens is stronger than that at the center.…”

Section: Methodsmentioning

confidence: 99%

Electrically-Tunable Blue Phase Liquid Crystal Microlens Array Based on a Photoconductive Film

Huang

Chuang

et al. 2020

Polymers

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This paper proposes an effective approach to fabricate a blue phase liquid crystal (BPLC) microlens array based on a photoconductive film. Owing to the characteristics of photo-induced conducting polymer polyvinylcarbazole (PVK), in which conductivity depends on the irradiation of UV light, a progressive mask resulting in the variation of conductivity is adopted to produce the gradient distribution of the electric field. The reorientations of liquid crystals according to the gradient distribution of the electric field induce the variation of the refractive index. Thus, the incident light experiences the gradient distribution of the refractive index and results in the focusing phenomenon. The study investigates the dependence of lens performance on UV exposure time, the focal length of the lens, and focusing intensities with various incident polarizations. The BPLC microlens array exhibits advantages such as electrically tunability, polarization independence, and fast response time.

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Electric Field-Driven Shifting and Expansion of Photonic Band Gaps in 3D Liquid Photonic Crystals

Cited by 63 publications

References 39 publications

Asymmetric Tunable Photonic Bandgaps in Self‐Organized 3D Nanostructure of Polymer‐Stabilized Blue Phase I Modulated by Voltage Polarity

Asymmetric Tunable Photonic Bandgaps in Self‐Organized 3D Nanostructure of Polymer‐Stabilized Blue Phase I Modulated by Voltage Polarity

Light‐Patterned Crystallographic Direction of a Self‐Organized 3D Soft Photonic Crystal

Electrically-Tunable Blue Phase Liquid Crystal Microlens Array Based on a Photoconductive Film

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