Michael E. McConney
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Spatially Programmable Chirality in Cellulose Nanocrystal Films via Rotational Magnetic Flow Open
Programmed assembly of natural materials on a large scale is often limited by inherent factors, including dimensional dispersity, complex hierarchical organization, and slow processing kinetics. In this study, we demonstrate a scalable str…
Exploring Weak Turbulence of Phonon and Magnon Beams in Magneto-Acoustic Ultrathin Films Open
This study presents a simple theoretical model describing narrow envelope surface acoustic waves (phonons) and spin waves (magnons) in an ultrathin ferromagnetic film. Based on the general principles of weak wave turbulence, the model cons…
Thermoplasmonic‐Controlled Optical Filters Based on the Combination of Chiral Liquid Crystals and Metasurfaces Open
A novel class of photonic filters is obtained by integrating a large‐area optical plasmonic metasurface with a broadband cholesteric liquid crystal (CLC) Bragg reflector. By utilizing the photo‐thermal characteristics of the optical plasmo…
View article: Laser‐Induced Crystallization and Oxidation Phase Diagrams for High‐Throughput Evaluation of MoS<sub>2</sub>/MoO<sub>x</sub> Optical Thin Films
Laser‐Induced Crystallization and Oxidation Phase Diagrams for High‐Throughput Evaluation of MoS<sub>2</sub>/MoO<sub>x</sub> Optical Thin Films Open
The development of thin film materials for optoelectronic and meta‐optic applications requires the discovery of novel materials and reliable control over their optical constants during the growth process. In this work, localized laser oxid…
View article: Electrochromic Encryption and Decryption Smart Films Fabricated by Selective Photopolymerization of Polarization‐Dependent Triphenylamine‐Based Thin Films
Electrochromic Encryption and Decryption Smart Films Fabricated by Selective Photopolymerization of Polarization‐Dependent Triphenylamine‐Based Thin Films Open
The newly designed triphenylamine (TPA) based asymmetric monomer (TPA‐A) is synthesized for the development of a high‐security information encryption system. TPA‐A exhibits photoluminescence (PL) emission and redox‐active electrochromic (E…
Tamm Plasmons: Properties, Applications, and Tuning with Help of Liquid Crystals Open
This article provides a brief overview of the research on localized optical states called Tamm plasmons (TPs) and their potential applications, which have been extensively studied in recent decades. These states arise under the influence o…
Vivid Structural Coloration in Transparent MXene‐Cellulose Nanocrystals Composite Films Open
We demonstrate shear‐printed layered photonic films with vivid structural coloration from bio‐derived cellulose nanocrystals and highly aligned Ti 3 C 2 T x MXene nanoflakes. These ultrathin films (700–1500 nm) show high light transmittanc…
Printed Twisted Thin Films with Near-Infrared Bandgaps and Tailored Chiroptical Properties Open
In this work, twisted helical cellulose nanocrystals films with preprogrammed circular polarization and near-infrared reflectance are fabricated via a blade-based 3D printing method. The films are composed of stacked nanoscale slabs with h…
Liquid crystalline geometrical phase Alvarez-Lohmann lenses Open
Thin-film LC based geo-phase optics have previously been demonstrated to drastically reduce size, weight, and power requirements for large-aperture optical systems while providing non-mechanical functionality for discrete values – for exam…
Magneto-Responsive Chiral Optical Materials: Flow-Induced Twisting of Cellulose Nanocrystals in Patterned Magnetic Fields Open
Magnetic fields have been used to uniformly align the lyotropic chiral nematic (cholesteric) liquid crystalline (LC) phase of biopolymers to a global orientation and optical appearance. Here, we demonstrate that, in contrast, weak and patt…
Left and Right‐Handed Light Reflection and Emission in Ultrathin Cellulose Nanocrystals Films with Printed Helicity Open
Natural polymers, particularly plant‐derived nanocelluloses, self‐organize into hierarchical structures, enabling mechanical robustness, bright iridescence, emission, and polarized light reflection. These biophotonic properties are facilit…
Cascade Structured Plasmonic Liquid Crystal Biosensor for the Rapid Detection of Harmful Bacteria Dispersed in Potable Water Open
Pathogenic microorganisms contaminating potable water are a serious water quality concern because they have severe consequences for human and environmental health. Managing water contamination requires the availability of fast and highly s…
Switchable Optical Properties of Dyes and Nanoparticles in Electrowetting Devices Open
The optical properties of light-absorbing materials in optical shutter devices are critical to the use of such platforms for optical applications. We demonstrate switchable optical properties of dyes and nanoparticles in liquid-based elect…
Investigating the Electro-Optic Response of Steroid Doped Liquid Crystal Devices Open
Nature is highly efficient at producing chiral compounds that are enantiomerically pure. The inherent chirality of naturally occurring biomolecules means that many have the potential to be used as chiral dopants for cholesteric liquid crys…
Recent Advances in Electro-Optic Response of Polymer-Stabilized Cholesteric Liquid Crystals Open
Cholesteric liquid crystals (CLC) are molecules that can self-assemble into helicoidal superstructures exhibiting circularly polarized reflection. The facile self-assembly and resulting optical properties makes CLCs a promising technology …
Anti-counterfeiting holographic liquid crystal gels with color and pattern control Open
Optically tunable and switchable reflection grating LC gels can be used in anti-counterfeiting materials for optical security and encryption. Reflection colors and patterns appear by applying an AC field and a DC field controls the hologra…
View article: When Chirophotonic Film Meets Wrinkles: Viewing Angle Independent Corrugated Photonic Crystal Paper (Adv. Mater. 1/2023)
When Chirophotonic Film Meets Wrinkles: Viewing Angle Independent Corrugated Photonic Crystal Paper (Adv. Mater. 1/2023) Open
Photonic Crystal Papers In article number 2206764, Dae-Yoon Kim, Kwang-Un Jeong, and co-workers develop 1D stripe and 2D wavy wrinkled photonic crystal papers to demonstrate consistent reflection of colors regardless of viewing angle. The …
White light thermoplasmonic activated gold nanorod arrays enable the photo-thermal disinfection of medical tools from bacterial contamination Open
AuNRs immobilized on rigid substrates are utilized as thermo-optical transducers under white light irradiation. The achieved temperature increase is suitable for producing photo-thermal disinfection of surgical tools contaminated with E. c…
Adaptive Properties of a Ferromagnetic Single-Domain Grain in Alternating Magnetic Fields Open
A general self-consistent theory of adaptive properties of a ferromagnetic single-domain grain in alternating magnetic fields is constructed. Thresholds of new family of parametric instabilities of all orders are calculated. It is shown th…
View article: Effects of Crystalline Disorder on Interfacial and Magnetic Properties of Sputtered Topological Insulator/Ferromagnet Heterostructures
Effects of Crystalline Disorder on Interfacial and Magnetic Properties of Sputtered Topological Insulator/Ferromagnet Heterostructures Open
Thin films of Topological insulators (TIs) coupled with ferromagnets (FMs) are excellent candidates for energy-efficient spintronics devices. Here, the effect of crystalline structural disorder of TI on interfacial and magnetic properties …
View article: Interface Engineering Enabled Low Temperature Growth of Magnetic Insulator on Topological Insulator
Interface Engineering Enabled Low Temperature Growth of Magnetic Insulator on Topological Insulator Open
Combining topological insulators (TIs) and magnetic materials in heterostructures is crucial for advancing spin-based electronics. Magnetic insulators (MIs) can be deposited on TIs using the spin-spray process, which is a unique non-vacuum…
View article: Review on energy storage in lead‐free ferroelectric films
Review on energy storage in lead‐free ferroelectric films Open
Rapidly developing electronics industry is striving for higher energy‐storage capability dielectric capacitors for pulsed power electronic devices. Both high dielectric permittivity and high dielectric breakdown strength are essential prop…