Left- and right-circularly polarized light-sensing based on colored and mechano-responsive chiral nematic liquid crystals

Yoshida, Jun; Tamura, Shuhei; Yuge, Hidetaka; Watanabe, Go

doi:10.1039/c7sm01975k

Cited by 37 publications

(26 citation statements)

References 30 publications

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“…Chiral photonic materials that are capable of responsive selective reflection of circularly polarized light are interesting in some respects, as they enable new technologies such as camouflaging, smart wearable devices, and remote monitoring of the mechanical strain of implants . Efforts have been made to developing chiral photonic materials with tunable selective reflection of circularly polarized light and long‐term stability in coloration . Elegantly designed copolymer films based on a liquid crystal unit and a chiral side chain exhibited circularly polarized light by selective reflection.…”

Section: Methodsmentioning

confidence: 99%

Chiral Photonic Cellulose Films Enabling Mechano/Chemo Responsive Selective Reflection of Circularly Polarized Light

Zheng

Jiang

et al. 2019

Advanced Optical Materials

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Stimuli‐responsive selective reflection of circularly polarized light in a broad wavelength range is of significance from scientific and technological viewpoints. Herein, chiral photonic cellulose films are fabricated which exhibit selective reflection of circularly polarized light responsive to mechanical and chemical stimuli. The chiral photonic cellulose films are highly deformable with the strain‐at‐break up to 40.8%, which is the highest among reported chiral photonic cellulose films. Selective reflection of left‐handed circularly polarized light responsive to bending and uniaxial tensioning across the entire visible spectrum is demonstrated, as well as reversible response to water vapor (10–100% relative humidity) from the visible to the near‐infrared region with Δλmax = 492 nm. The stimuli response is realized by alterable helical organization based on supramolecular chemistry. The current work provides a general strategy for rational design of multistimuli‐responsive selective reflection of circularly polarized light, and a soft material platform for scalable camouflaging and security materials.

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Section: Methodsmentioning

confidence: 99%

Chiral Photonic Cellulose Films Enabling Mechano/Chemo Responsive Selective Reflection of Circularly Polarized Light

Zheng

Jiang

et al. 2019

Advanced Optical Materials

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“…Moreover, the UC‐CPL emission of CsPbBr 3 PKNCs and the photonic bandgap of N*LC could be recovered by applying mechanical force. [ 24 ] Thus, a voltage‐force regulated chiroptical switch of UC‐CPL was realized with great stability (Figure 4d; and Figure S8, Supporting Information).…”

Section: Figurementioning

confidence: 99%

Electric‐Field‐Regulated Energy Transfer in Chiral Liquid Crystals for Enhancing Upconverted Circularly Polarized Luminescence through Steering the Photonic Bandgap

et al. 2020

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Circularly polarized luminescent materials with high dissymmetry factor (glum) have been attracting increasing attention due to their distinctive photonic properties. In this work, by incorporating upconversion nanoparticles (UCNPs) and CsPbBr3 perovskite nanocrystals (PKNCs) into a chiral nematic liquid crystal (N*LC), enhanced upconverted circularly polarized luminescence (UC‐CPL) based on a radiative energy transfer (RET) process from UCNPs to CsPbBr3 PKNCs is successfully implemented. By locating the emission peak of CsPbBr3 PKNCs at the center of the photonic bandgap of N*LC, the maximum glum value of UC‐CPL can be amplified to an extremely large value of 1.1. Meanwhile, upconverted emission of UCNPs can be significantly enhanced due to the band edge enhancement effect of the N*LC, subsequently enhancing the emission of the CsPbBr3 PKNCs through the RET process. In addition, an applied electric field can switch the upconverted emission of the UCNPs, as well as the RET process, enabling an electric‐field‐controlled UC‐CPL switch.

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“…[ 12c ] Through evaporation‐induced self‐assembly (EISA), the liquid crystal suspension can be consolidated into cholesteric CNC films which selectively reflect left‐handed circularly polarized light (CPL) and present iridescent structural colors. [ 17 ] According to Bragg's law, the reflectance wavelength depends on the pitch of the helical structure and the average refractive index. [ 18 ] Security features using polarization‐dependent structural colors and selective swelling patterns have been developed based on cholesteric CNCs.…”

Section: Introductionmentioning

confidence: 99%

Re‐Printable Chiral Photonic Paper with Invisible Patterns and Tunable Wettability

Chen

Feng

Chen

et al. 2021

Adv Funct Materials

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The construction of invisible patterns via high‐resolution printing and the independent encoding/decoding of complex information can lead to promising applications in steganography and watermarking for optical encryption. Herein, a rewritable chiral photonic paper formed by cholesteric cellulose nanocrystals and polycation is reported. The chemically crosslinked polycation network interpenetrates in the cholesteric structure while retaining the optical properties of the photonic crystals. The film exhibits controllable wettability via anion exchange, leading to extremely low contrast in the dry state but high contrast by a rapid wetting response. Triple invisible information is independently encoded on the films, including invisible patterns caused by reversible counterion‐controlled wettability, permanent fluorescent labels based on fluorescent counterions, and polarization‐dependent structural colors based on cholesteric structures. Full color patterns can be reversibly constructed via inkjet printing, with a high resolution of 100 µm. In addition, the circular polarization characteristics of the cellulose nanocrystals, liquid crystals, endow the system with complex and independent responses, realizing a wetting/polarization double‐key decryption. This work provides a simple and effective optical technique for coding complex information on a single material platform and expands the techniques available to achieve invisible patterns for sensing and anti‐counterfeiting.

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Left- and right-circularly polarized light-sensing based on colored and mechano-responsive chiral nematic liquid crystals

Cited by 37 publications

References 30 publications

Chiral Photonic Cellulose Films Enabling Mechano/Chemo Responsive Selective Reflection of Circularly Polarized Light

Chiral Photonic Cellulose Films Enabling Mechano/Chemo Responsive Selective Reflection of Circularly Polarized Light

Electric‐Field‐Regulated Energy Transfer in Chiral Liquid Crystals for Enhancing Upconverted Circularly Polarized Luminescence through Steering the Photonic Bandgap

Re‐Printable Chiral Photonic Paper with Invisible Patterns and Tunable Wettability

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