Conditions for enhancing chiral nanophotonics near achiral nanoparticles

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The interaction of circularly polarized light with matter is the basis for molecular circular dichroism spectroscopy, optical spin manipulation, and optical torques. However, chiroptical effects are usually hampered by weak chiral light–matter interaction. Nanophotonic structures can enhance optical intensity to boost interactions, but magnifying chiral effects requires that the near field remains chiral in the process. Here, we propose the conditions and limits for enhancing different chiroptical effects near achiral metasurfaces with maximum chirality of the evanescent fields. We illustrate these conditions with arrays of metal and dielectric nanodisks and decompose their distinct electromagnetic metrics into propagating and evanescent Fourier orders. We prove that a nanostructure cannot be universally optimal for different chirality metrics and therefore applications. For example, arrays tailored for enhanced spin excitation with spatially uniform circular polarization destroy circular dichroism. Conversely, we predict a limit of maximum attainable circular dichroism in highly evanescent Fourier orders through a simple relation with the evanescent wavevector and polarization. Our results establish guidelines and constraints for nanophotonic enhancement using evanescent fields in diverse chiroptical applications.
Originele taal-2Engels
Pagina's (van-tot)2583-2589
Aantal pagina's7
TijdschriftACS Photonics
Volume6
Nummer van het tijdschrift10
DOI's
StatusGepubliceerd - 16 okt 2019

Vingerafdruk

Evanescent fields
Nanophotonics
Chirality
Dichroism
Circular Dichroism
Nanoparticles
dichroism
Molecular spectroscopy
Circular dichroism spectroscopy
chirality
nanoparticles
Circular polarization
Light polarization
Nanostructures
Torque
Electromagnetic Phenomena
Metals
interactions
Polarization
circular polarization

Citeer dit

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title = "Conditions for enhancing chiral nanophotonics near achiral nanoparticles",
abstract = "The interaction of circularly polarized light with matter is the basis for molecular circular dichroism spectroscopy, optical spin manipulation, and optical torques. However, chiroptical effects are usually hampered by weak chiral light–matter interaction. Nanophotonic structures can enhance optical intensity to boost interactions, but magnifying chiral effects requires that the near field remains chiral in the process. Here, we propose the conditions and limits for enhancing different chiroptical effects near achiral metasurfaces with maximum chirality of the evanescent fields. We illustrate these conditions with arrays of metal and dielectric nanodisks and decompose their distinct electromagnetic metrics into propagating and evanescent Fourier orders. We prove that a nanostructure cannot be universally optimal for different chirality metrics and therefore applications. For example, arrays tailored for enhanced spin excitation with spatially uniform circular polarization destroy circular dichroism. Conversely, we predict a limit of maximum attainable circular dichroism in highly evanescent Fourier orders through a simple relation with the evanescent wavevector and polarization. Our results establish guidelines and constraints for nanophotonic enhancement using evanescent fields in diverse chiroptical applications.",
keywords = "Evanescent waves, Optical Chirality, Mie resonances, Dielectric Nanoantennas, Circular dichroism, Spin polarization, Near field, Plasmonic resonances, Optical chirality, Nanoparticle arrays",
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Conditions for enhancing chiral nanophotonics near achiral nanoparticles. / Raziman, T.V.; Hjelmgart - Godiksen, Rasmus; Müller, Moos; González Curto, Alberto (Corresponding author).

In: ACS Photonics, Vol. 6, Nr. 10, 16.10.2019, blz. 2583-2589.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

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AU - Müller, Moos

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AB - The interaction of circularly polarized light with matter is the basis for molecular circular dichroism spectroscopy, optical spin manipulation, and optical torques. However, chiroptical effects are usually hampered by weak chiral light–matter interaction. Nanophotonic structures can enhance optical intensity to boost interactions, but magnifying chiral effects requires that the near field remains chiral in the process. Here, we propose the conditions and limits for enhancing different chiroptical effects near achiral metasurfaces with maximum chirality of the evanescent fields. We illustrate these conditions with arrays of metal and dielectric nanodisks and decompose their distinct electromagnetic metrics into propagating and evanescent Fourier orders. We prove that a nanostructure cannot be universally optimal for different chirality metrics and therefore applications. For example, arrays tailored for enhanced spin excitation with spatially uniform circular polarization destroy circular dichroism. Conversely, we predict a limit of maximum attainable circular dichroism in highly evanescent Fourier orders through a simple relation with the evanescent wavevector and polarization. Our results establish guidelines and constraints for nanophotonic enhancement using evanescent fields in diverse chiroptical applications.

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