Plasmonic Nanostructured Cellular Automata

Alkhazraji, E.; Ghalib, Asim; Manzoor, Kaiser; Alsunaidi, M. A.

doi:10.1051/epjconf/201713900001

Cited by 2 publications

(2 citation statements)

References 8 publications

(9 reference statements)

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“…Mathematical description and pattern analysis of self-assembled chiral components could enable direct comparison of preparation pathways of materials with nanoscale, microscale and macroscale chiral geometries. Graph theory can be applied to assess the relationship between multiscale chirality, the geometries of self-assembled structures and their functionalities 28,178,[231][232][233] , for example to analyse the structural complexity of hierarchically organized assemblies of Au-Cys nanoplatelets 28 . Graph theory is applicable to any scale, thus enabling the quantitative comparison of different chiral morphologies with mirror asymmetry.…”

Section: Mathematical Structure and Pattern Analysismentioning

confidence: 99%

Bioinspired chiral inorganic nanomaterials

Cho

Guerrero‐Martínez

et al. 2023

Nat Rev Bioeng

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From small molecules to entire organisms, evolution has refined biological structures at the nanoscale, microscale and macroscale to be chiral-that is, mirror dissymmetric. Chirality results in biological, chemical and physical properties that can be influenced by circularly polarized electromagnetic fields. Chiral nanoscale materials can be designed that mimic, refine and advance biological chiral geometries, to engineer optical, physical and chemical properties for applications in photonics, sensing, catalysis and biomedicine. In this Review, we discuss the mechanisms underlying chirality transfer in nature and provide design principles for chiral nanomaterials. We highlight how chiral features emerge in inorganic materials during the chemical synthesis of chiral nanostructures, and outline key applications for inorganic chiral nanomaterials, including promising designs for biomedical applications, such as biosensing and immunomodulation. We conclude Nature Reviews Bioengineering Review article nanostructures). We describe hierarchical multiscale chirality in biological systems (for example, cytoskeleton hypothesis and chirality in biominerals), and analyse the most abundant chirality transfer mechanisms in biology, including enantioselective interaction between surfaces and chiral molecules, template-induced synthesis and chirality transfer, and photon-induced chiral nanomaterials. However, as in many natural systems 54 , these transfer mechanisms cannot be analysed separately because a concomitance of effects is responsible for the resulting chiral morphologies, in particular for highly crystalline nanomaterials, for which template-induced and photon-induced syntheses cannot be entirely decoupled from enantioselective interactions at high Miller index surfaces. Finally, we present potential applications in photonics (for example, polarization-control, non-linear optics), sensing (enantiomer discrimination), catalysis (chemical and pharmaceutical) and biomedicine (for example, photothermal and photodynamic therapies). Chirality in biologyChirality exists across multiple size scales in biological entities, dictating their geometries, properties and behaviour. For example, aminoacyl-tRNA synthases, enzymes involved in the selection of amino acids in protein synthesis, preferentially bind to l-amino acids by steric exclusion of d-amino acids 55 . Peptide elongation of d-amino acids at the ribosomes is slow owing to the large distance between the reaction sites 56 , limiting the production of peptides with incorporated d-amino acids 57,58 . The incorporation of some d-amino acids, such as d-Asp and d-Ser, has been linked to amyloid-β peptides present in the brains of patients with Alzheimer disease 59 , indicating that chirality at the molecular level could extend its influence to the organism and its behaviour.Chirality also offers survival advantage(s) for organisms. Fan-like petal arrangements of mutated Arabidopsis thaliana show left-handed chirality and clockwise twisting. The handedness of their asymmetric g...

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Section: Mathematical Structure and Pattern Analysismentioning

confidence: 99%

Bioinspired chiral inorganic nanomaterials

Cho

Guerrero‐Martínez

et al. 2023

Nat Rev Bioeng

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“…In many existing works, , a mobile terminal chassis was considered as the main radiating element for frequencies greater than 1 GHz when the chassis modes were excited. Remember that all these antennas have different applications such as MIMO, pattern reconfigurability, and wide‐band but the common thing is that all of them rely on the chassis as the main radiator.…”

Section: Introductionmentioning

confidence: 99%

New antenna mode generation based on theory of characteristic modes

Ghalib

Sharawi

2018

Int J RF Microw Comput Aided Eng

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In this article, the effect of actual antenna elements on rectangular chassis modes is investigated. The study is performed on three different antenna types, that is, printed inverted-F antenna (PIFA), printed monopole, and printed loop antennas. For the first time, we show that the presence of the antenna generates a completely new mode called the "antenna mode" (compared with chassis mode modifications as in other existing works). The new "antenna mode" only depends on the shape or geometry of the antenna and is independent of its location on the chassis (unlike chassis modes). In the presence of the antenna, the current maxima lies on the antenna element for all the modified chassis modes and the newly generated "antenna mode." In such scenarios, pure excitation of single characteristic mode (CM) is not possible with known existing techniques. K E Y W O R D S loop antenna, monopole, PIFA, TCM

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Plasmonic Nanostructured Cellular Automata

Cited by 2 publications

References 8 publications

Bioinspired chiral inorganic nanomaterials

Bioinspired chiral inorganic nanomaterials

New antenna mode generation based on theory of characteristic modes

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