Broadband Circular Polarizers via Coupling in 3D Plasmonic Meta-Atom Arrays

Guo, Jiacen; Kim, Ji-Young; Yang, Shengsong; Xu, Jun; Choi, Yun Chang; Stein, Aaron; Murray, Christopher B.; Kotov, Nicholas A.; Kagan, Cherie R.

doi:10.1021/acsphotonics.1c00310

Cited by 10 publications

(29 citation statements)

References 34 publications

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“…Depending on their morphology, dimension, and chemical composition, NCs can manipulate electromagnetic radiation over a broad spectral range. Upon assembly into 3D mesoscale superstructures, ,− the properties of NCs hybridize through excitonic, − electronic, − magnetic, − plasmonic, − phononic, , and photonic ,, coupling mechanisms. While the coupling strength is generally controlled by the distance between NCs, the morphology of the superstructure plays an important role in mediating the interaction with external stimuli.…”

Section: Introductionmentioning

confidence: 99%

Monodisperse Nanocrystal Superparticles through a Source–Sink Emulsion System

et al. 2022

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Superparticles made from colloidal nanocrystals have recently shown great promise in bridging the nanoscale and mesoscale, building artificial materials with properties designed from the bottom-up. As these properties depend on the dimension of the superparticle, there is a need for a general method to produce monodisperse nanocrystal superparticles. Here, we demonstrate an approach that readily yields spherical nanocrystal superparticles with a polydispersity as low as 2%. This method relies on the controlled densification of the nanocrystal-containing “source” emulsion by the swelling of a secondary “sink” emulsion. We show that this strategy is general and rapid, yielding monodisperse superparticles with controllable sizes and morphologies, including core/shell structures, within a few minutes. The superparticles show a high optical quality that results in lasing through the whispering-gallery modes of the spherical structure, with an average quality factor of 1600. Assembling superparticles into small clusters selects the wavelength of the lasing modes, demonstrating an example of collective photonic behavior of these artificial solids.

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Section: Introductionmentioning

confidence: 99%

Monodisperse Nanocrystal Superparticles through a Source–Sink Emulsion System

et al. 2022

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“…[29] On the other hand, top-down lithographic approaches provide access to ultrathin PCD metasurfaces that offer strong and broadband chiral response. [30,31] It happens, however, at the expense of long fabrication times and limited availability of building blocks with different morphologies. Obtaining composites of metal NPs and chiral soft matter matrices by combined soft lithography and bottom-up approaches might be the way to resolve these issues, as they provide efficient, universal, and scalable preparation methods of PCD materials, thereby advancing toward their integration into flexible photonic devices.…”

Section: Introductionmentioning

confidence: 99%

Liquid Crystal Templated Chiral Plasmonic Films with Dynamic Tunability and Moldability

Grzelak

Tupikowska

Vila‐Liarte

et al. 2022

Adv Funct Materials

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Thin films sustaining plasmonic circular dichroism (PCD) have acquired high scientific relevance and a great potential for applications. While most efforts in PCD thin film structures focus on lithographically fabricated static metasurfaces, the bottom-up fabrication of active chiral plasmonic films constitutes an alternative approach. Herein, the preparation of PCD thin films by melting and freezing a mixture of liquid crystal (LC), a chiral dopant, and gold nanoparticles (Au NPs), serving as helical matrix, symmetry breaking inducer, and plasmonic component, respectively is reported. UV-vis and circular dichroism spectroscopies, as well as theoretical modeling are used to disclose the interactions among thin film components, toward maximizing the PCD dissymmetry factor (g-factor). Variation of substrate temperature affords reversible off/on switching of the chiroptical response. The soft nature of LC matrix enables patterning of the films via a thermal nanoimprinting method, using a poly dimethylsiloxane mold for transfer-printing onto a flexible substrate, leading to stretchable PCD films. The PCD wavelengths can be readily tuned by varying the geometry of the Au NPs. This work provides an efficient technique to produce PCD thin films with active plasmonic properties and mechanical tunability.

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“…Kagan group [ 120 , 122 ] investigated 3D metamaterials using NP assemblies. They used pre-patterned 2D planar structures in NP/metal bilayer structures as starting materials and triggered the folding of the bilayers by chemical and thermal treatments to reduce the spacing between NPs (Fig.…”

Section: Chiroptical Properties Of Inorganic Nanostructuresmentioning

confidence: 99%

“…The black data points indicate samples before annealing and red, orange, and blue data points represent samples after annealing at 150, 120, and 90 °C for 24 h, respectively. Reproduced with permission from [ 122 ] …”

Section: Chiroptical Properties Of Inorganic Nanostructuresmentioning

confidence: 99%

Recent advances in chiral nanomaterials with unique electric and magnetic properties

et al. 2022

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Research on chiral nanomaterials (NMs) has grown radically with a rapid increase in the number of publications over the past decade. It has attracted a large number of scientists in various fields predominantly because of the emergence of unprecedented electric, optical, and magnetic properties when chirality arises in NMs. For applications, it is particularly informative and fascinating to investigate how chiral NMs interact with electromagnetic waves and magnetic fields, depending on their intrinsic composition properties, atomic distortions, and assembled structures. This review provides an overview of recent advances in chiral NMs, such as semiconducting, metallic, and magnetic nanostructures.

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Broadband Circular Polarizers via Coupling in 3D Plasmonic Meta-Atom Arrays

Cited by 10 publications

References 34 publications

Monodisperse Nanocrystal Superparticles through a Source–Sink Emulsion System

Monodisperse Nanocrystal Superparticles through a Source–Sink Emulsion System

Liquid Crystal Templated Chiral Plasmonic Films with Dynamic Tunability and Moldability

Recent advances in chiral nanomaterials with unique electric and magnetic properties

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