Switchable Plasmonic Film Using Nanoconfined Liquid Crystals

Ryu, Seong Ho; Yoon, Dong Ki

doi:10.1021/acsami.7b07693

Cited by 14 publications

(13 citation statements)

References 41 publications

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“…The tinctorial transformation of the SAMFs was ascribed to different dielectric environments and plasmonic interparticle coupling caused by the contraction and extension of polymer chains in various surroundings. 9,24,25,37 It could be made evident from their corresponding reflectance spectra that the peaks of functional SAMF blue-shifted from ∼627 nm (in the dry state and in n-hexane) to 595 nm (in aqueous solution) and 586 nm (in absolute ethyl alcohol), whereas the peaks of nonfunctional SAMF remained 647−643 nm in these conditions. Even more noteworthy is that the color of the film changed in aqueous solution and absolute ethyl alcohol because they are good solvents for collapsed PG1A chains to freely stretch, whereas they maintained the same color in n-hexane on account of the insolubility of the copolymer.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

pH and Temperature Dual-Responsive Plasmonic Switches of Gold Nanoparticle Monolayer Film for Multiple Anticounterfeiting

Liu

Qiao

et al. 2018

Langmuir

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Two-dimensional (2D) gold nanoparticle (Au NP) monolayer film possesses a lot of fascinating peculiarities, and has shown promising applications in photoelectrical devices, catalysis, spectroscopy, sensors, and anticounterfeiting. Because of the localized surface plasmon resonance (LSPR) property predetermined by the natural structure of metal nanoparticles, it is usually difficult to realize the reversible LSPR transition of 2D film. In this work, we report on the fabrication of a large-area free-standing Au NP monolayer film with dual-responsive switchable plasmonic property using a pH- or thermal-responsive dendronized copolymer as a stimuli-sensitive linker. In this system, an oligoethylene-glycol-based (OEG-based) dendronized copolymer (named PG1A) with pH or temperature sensitivity was first modified onto the surface of a Au NP. Then, polyethylene glycol dibenzyl aldehyde (PEG-DA) was introduced to interact with the amino moieties from PG1A before the process of oil–water interfacial self-assembly of NPs, resulting in an elastic, robust, pH- or temperature-sensitive interpenetrating network among Au NPs in monolayer films. In addition, the film could exhibit reversibly plasmonic shifts of about 77 nm and inherent color changes through varying temperature or pH. The obtained free-standing monolayer film also shows an excellent transferable property, which can be easily transferred onto substrates such as plastic molds, PDMS, copper grids, and silicon wafers. In virtue of these peculiarities of the free-standing property, special plasmonic signal, and homologous macroscopic color, the transferred film was primely applied to an anticounterfeiting security label with clear color change at the designed spots, providing a new avenue to plasmonic nanodevices with various applications.

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Section: ■ Results and Discussionmentioning

confidence: 99%

pH and Temperature Dual-Responsive Plasmonic Switches of Gold Nanoparticle Monolayer Film for Multiple Anticounterfeiting

Liu

Qiao

et al. 2018

Langmuir

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“…Here phase-change materials, in particular employing inorganic, hard matter with an amorphous to crystalline transition open up many opportunities for implementing externally tunable metamaterials as the reversible transition is accompanied by a considerable change of the refractive index [4][5][6] . Also embedding liquid crystals (LCs) in nanoporous solids allows one to combine self-assembly and phase transition behavior of organic, soft matter with a scaffold structure that provides mechanical robustness, and thus to fabricate soft-hard hybrids with tunable multiphysical couplings in terms of self-organization, mechanical, electrical and optical properties [7][8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Dynamic Kerr and Pockels Electro-Optics of Liquid Crystals in Nanopores for Active Photonic Metamaterials

Kityk¹,

Nowak²,

Reben³

et al. 2021

Preprint

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Photonic metamaterials with properties unattainable in base materials are already beginning to revolutionize optical component design. However, their exceptional characteristics are often static, as artificially engineered into the material during the fabrication process. This limits their application for in-operando adjustable optical devices and active optics in general. Here, for a hybrid material consisting of a liquid crystal-infused nanoporous solid, we demonstrate active and dynamic control of its meta-optics by applying alternating electric fields parallel to the long axes of its cylindrical pores. First-harmonic Pockels and second-harmonic Kerr birefringence responses, strongly depending on the excitation frequency-and temperature, are observed in a frequency range from 50 Hz to 50 kHz. This peculiar behavior is quantitatively traced by a Landau-De Gennes free energy analysis to an order-disorder orientational transition of the rod-like mesogens and intimately related changes in the molecular mobilities and polar anchoring at the solid walls on the single-pore, meta-atomic scale. Thus, our study evidences that liquid crystal-infused nanopores exhibit integrated multi-physical couplings and reversible phase changes that make them particularly promising for the design of photonic metamaterials with thermo-electrically tunable birefringence in the emerging field of spacetime metamaterials aiming at a full spatio-temporal control of light.

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“…Well-defined hyperbolic multi-film structures and advances in material design (e.g., meta-materials and transformation optics) have made it possible to customize the optical dielectric constant [9][10][11]. In the tuning perspective, the optical performance of soft liquid-crystal materials or other optical tunable materials on nano-metallic structures has been widely reported [1,[12][13][14][15][16][17][18][19][20]. Soft liquid-crystal materials are easily manipulated and highly effective in the active tuning of optical parameters.…”

Section: Introductionmentioning

confidence: 99%

Spatially Broadband Coupled-Surface Plasmon Wave Assisted Transmission Effect in Azo-Dye-Doped Liquid Crystal Cell

2020

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Active tuning on a plasmonic structure is discussed in this report. We examined the transient transmission effects of an azo-dye-doped liquid crystal cell on a metallic surface grating. The transition between isotropic and nematic phases in liquid crystal generated micro-domains was shown to induce the dynamic scattering of light from a He-Ne laser, thereby allowing transmission through a non-transparent aluminum film overlaying a dielectric grating. Various grating pitches were tested in terms of transmission effects. The patterned gratings include stripe ones and circular forms. Our results indicate that surface plasmon polariton waves are involved in the transmission process. We also demonstrated how momentum diagrams of gratings and Surface Plasmon Polariton (SPP) modes combined with Mie scattering effects could explain the broadband coupling phenomenon. This noteworthy transition process could be applied to the development of spatially broadband surface plasmon polariton coupling devices.

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Switchable Plasmonic Film Using Nanoconfined Liquid Crystals

Cited by 14 publications

References 41 publications

pH and Temperature Dual-Responsive Plasmonic Switches of Gold Nanoparticle Monolayer Film for Multiple Anticounterfeiting

pH and Temperature Dual-Responsive Plasmonic Switches of Gold Nanoparticle Monolayer Film for Multiple Anticounterfeiting

Dynamic Kerr and Pockels Electro-Optics of Liquid Crystals in Nanopores for Active Photonic Metamaterials

Spatially Broadband Coupled-Surface Plasmon Wave Assisted Transmission Effect in Azo-Dye-Doped Liquid Crystal Cell

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