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Disordered Nonlinear Metalens for Raman Spectral Nanoimaging

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dc.contributor.author Kharintsev S.S.
dc.contributor.author Kharitonov A.V.
dc.contributor.author Gazizov A.R.
dc.contributor.author Kazarian S.G.
dc.date.accessioned 2021-02-25T20:50:21Z
dc.date.available 2021-02-25T20:50:21Z
dc.date.issued 2020
dc.identifier.issn 1944-8244
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/162511
dc.description.abstract © 2020 American Chemical Society. Over the past decades, considerable progress has been made toward far-field optical imaging beyond the diffraction limit. However, most working proof-of-concepts are based on either time-consuming scanning of a subdiffraction focal spot over a sample or postrecovery treatment using a priori information on a sought image. To our knowledge, none of these can be regarded as being close to a perfect far-field superlensing system capable of real-time color imaging with subwavelength resolution. In this paper, we suggest a proof-of-concept for far-field nonlinear metalens that is made of a disordered metal-dielectric nanocomposite. Postoxidation of a refractory titanium nitride (TiN) thin film, used as a nonlinear plasmonic material, results in the formation of a titanium oxynitride (TiON) film comprising a mixture of multiple phases of TiOxNy. Due to a double epsilon-near-zero behavior near the percolation threshold, the TiON favors supercoupling of the incident light to surface plasmon resonance within the visible and near-infrared range. Point spread function narrowing is achieved owing to the multiplicative nature of stimulated Raman scattering (SRS) and enhanced third-order optical nonlinearity in TiN and TiO2 particle chains through plasmon resonances and Anderson localization of light, respectively. Combined with a conventional confocal optical microscope, the multimode metalens shows subwavelength resolution of λ/6NA at different visible wavelengths (SRS overtones) using multiwalled carbon nanotubes as a test sample. We are confident that our finding will bring us one step closer to developing a robust and versatile far-field super-resolution color imaging system and, eventually, implementing "eye-on-a-chip" technology.
dc.relation.ispartofseries ACS Applied Materials and Interfaces
dc.subject disordered plasmonics
dc.subject enhanced cubic susceptibility
dc.subject epsilon-near-zero material
dc.subject nonlinear metalens
dc.subject stimulated Raman scattering
dc.subject super-resolution
dc.subject titanium oxynitride
dc.title Disordered Nonlinear Metalens for Raman Spectral Nanoimaging
dc.type Article
dc.relation.ispartofseries-issue 3
dc.relation.ispartofseries-volume 12
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 3862
dc.source.id SCOPUS19448244-2020-12-3-SID85078389195


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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