Substrate-Induced Chirality in an Individual Nanostructure

Nechayev, Sergey; Barczyk, René; Mick, Uwe; Banzer, Peter

doi:10.1021/acsphotonics.9b00748

Cited by 31 publications

(24 citation statements)

References 63 publications

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“…[229,231] Such heterogeneous planar structures show strong substrate-induced chirality. [232,233] The addition of a different material can also provide additional functionality to the oligomer and has been used, for example, for an active control of the circular dichroism. A trimer of equally shaped nanopillars, where one consists of ferromagnetic nickel allows controlling optical transmission via an applied magnetic field (Figure 10c, ii).…”

Section: (15 Of 31)mentioning

confidence: 99%

The Beginner's Guide to Chiral Plasmonics: Mostly Harmless Theory and the Design of Large‐Area Substrates

Goerlitzer

Puri

Moses

et al. 2021

Advanced Optical Materials

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Plasmonic effects in noble metal nanostructures are probably one of the most widely recognized forms of nanotechnology. The tremendous success and interdisciplinary use of plasmonic Chiral plasmonics is a fascinating research field that is attractive to scientists from diverse backgrounds. Physicists study light-matter interactions, chemists seek ways to analyze enantiomeric molecules, biologists study living objects, and material engineers focus on scalable production processes. Successful access to this emergent field for an interdisciplinary community depends on overcoming three main issues. First, understanding the physical background of chiral plasmonics requires proper introduction in easy language. Second, pitfalls in the characterization of chiroplasmonic features can prevent accurate interpretation. Third, simple and robust methods capable of covering macroscopic substrate areas must be available. This tutorial-style review addresses these issues with the goal to provide a comprehensive introduction into chiral plasmonic nanostructures. It starts with a brief introduction of the relevant physics involved in chiral light−matter interactions. A brief guide about how to adequately characterize samples follows. Subsequently, an overview of fabrication techniques that produce chiral substrates over large areas is given, and the strengths and weaknesses of the different approaches are discussed. The focus is on simple and robust processes that do not require clean room facilities and can be implemented by a much larger scientific audience.

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Section: (15 Of 31)mentioning

confidence: 99%

The Beginner's Guide to Chiral Plasmonics: Mostly Harmless Theory and the Design of Large‐Area Substrates

Goerlitzer

Puri

Moses

et al. 2021

Advanced Optical Materials

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show abstract

“…[52,53] Hence, besides suggesting the possibility of using photonic integrated platforms for chiral applications, these findings may lay the groundwork for a greater variety of chiroptical effects. [54,55]…”

Section: Introductionmentioning

confidence: 99%

Toward Chiral Sensing and Spectroscopy Enabled by All‐Dielectric Integrated Photonic Waveguides

Vázquez‐Lozano

Martı́nez

2020

Laser & Photonics Reviews

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Chiral spectroscopy is a powerful technique enabling to identify optically the chirality of matter. So far, most experiments to check the chirality of matter or nanostructures have been performed through arrangements wherein both the optical excitation and detection are realized via circularly polarized light propagating in free space. However, for the sake of miniaturization, it would be desirable to perform chiral spectroscopy in photonic integrated platforms, with the additional benefit of massive parallel detection, low‐cost production, repeatability, and portability. Here it is shown that all‐dielectric photonic waveguides can support chiral modes under proper combination of fundamental eigenmodes. Two mainstream configurations are investigated: a dielectric wire with square cross section and a slotted waveguide. Three different scenarios in which such waveguides could be used for chiral detection are numerically analyzed: waveguides as near‐field probes, evanescent‐induced chiral fields, and chiroptical interaction in void slots. In all the cases, a metallic nanohelix is considered as a chiral probe, though all the approaches can be extended to other kinds of chiral nanostructures as well as matter. These results establish that chiral applications such as sensing and spectroscopy could be realized in standard integrated optics, in particular, with silicon‐based technology.

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“…Magnetoelectric coupling also leads to exceptionally strong polarization sensitivity of the optical response of dielectric nanoresonators placed on a metallic film [21]. Finally, the presence of substrate is known to modify the back-reflection Kerker conditions [22,23] and circular dichroic spectrum of a nanoresonator [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Multipole analysis of substrate-supported dielectric nanoresonator arrays with T-matrix method

Czajkowski,

Bancerek,

Antosiewicz

2020

Preprint

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Substrates, and layered media in general, are ubiquitous, affect the properties of whatever is in their vicinity, and their influence is, in an arbitrary framework, challenging to quantify analytically, especially for large arrays which escape explicit numerical treatment due to the computational burden. In this work, we develop a versatile T-matrix based framework in which we generalize the coupled multipole model towards arbitrarily high multipole orders and substrate-supported arrays. It allows us to study substrate-supported random/amorphous arrays of high index dielectric nanoparticles which are of wide interest due to relatively low losses and a highly tunable optical response, making them promising elements for nanophotonic devices. We discuss how multipole coupling rules evolve in the presence of a substrate in amorphous arrays for three interaction mechanisms: direct coupling between particles, substrate-mediated interparticle coupling and substrate-mediated self-coupling. We show the interplay between array density, distance from the substrate and its refractive in determining the optical response of an array. As an example, we use this framework to analyze refractometric sensing with substrate-supported arrays and demonstrate that the substrate plays a crucial role in determining the array sensitivity.

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Substrate-Induced Chirality in an Individual Nanostructure

Cited by 31 publications

References 63 publications

The Beginner's Guide to Chiral Plasmonics: Mostly Harmless Theory and the Design of Large‐Area Substrates

The Beginner's Guide to Chiral Plasmonics: Mostly Harmless Theory and the Design of Large‐Area Substrates

Toward Chiral Sensing and Spectroscopy Enabled by All‐Dielectric Integrated Photonic Waveguides

Multipole analysis of substrate-supported dielectric nanoresonator arrays with T-matrix method

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