Colorimetric and near-absolute polarization-insensitive refractive-index sensing in all-dielectric guided-mode resonance based metasurface

buir.contributor.orcidÖzbay, Ekmel|0000-0003-2953-1828en_US
dc.citation.epage19134en_US
dc.citation.issueNumber31en_US
dc.citation.spage19125en_US
dc.citation.volumeNumber123en_US
dc.contributor.authorYıldırım, Deniz Umuten_US
dc.contributor.authorGhobadi, Amiren_US
dc.contributor.authorSoydan, Mahmut Canen_US
dc.contributor.authorGökbayrak, Muraten_US
dc.contributor.authorToprak, Ahmeten_US
dc.contributor.authorBütün, Bayramen_US
dc.contributor.authorÖzbay, Ekmelen_US
dc.contributor.bilkentauthorYıldırım, Deniz Umut
dc.contributor.bilkentauthorGhobadi, Amir
dc.contributor.bilkentauthorSoydan, Mahmut Can
dc.contributor.bilkentauthorGökbayrak, Murat
dc.contributor.bilkentauthorToprak, Ahmet
dc.contributor.bilkentauthorBütün, Bayram
dc.contributor.bilkentauthorÖzbay, Ekmel
dc.date.accessioned2020-02-17T05:51:03Z
dc.date.available2020-02-17T05:51:03Z
dc.date.issued2019
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.description.abstractColorimetric detection of target molecules with insensitivity to incident-light polarization has attracted considerable attention in recent years. This resulted from the ability to provide rapid output and reduced assay times as a result of color changes upon altering the environment that are easily distinguishable by the naked eye. In this paper, we propose a highly sensitive refractive-index sensor, utilizing the excitation of guided modes of a novel two-dimensional periodically modulated dielectric grating-waveguide structure. The optimized nanosensor can numerically excite guided-mode resonances with an ultranarrow linewidth (full width at half-maximum) of 0.58 nm. Sensitivity is numerically investigated by considering the deposition of dielectric layers on the structure. For a layer thickness of 30 nm, the maximum sensitivity reached as high as 110 nm/refractive index unit (RIU), resulting in a very high figure of merit of 190. The fabricated devices with 30 nm aluminum oxide and zinc oxide coatings achieved a maximum sensitivity of 235.2 nm/RIU with a linewidth of 19 nm. Colorimetric detection with polarization insensitivity is confirmed practically by a simple optical microscope. Samples with different coatings have been observed to have clearly distinct colors, while the color of each sample is nearly identical upon azimuthal rotation. Excellent agreement is obtained between the numerical and experimental results regarding the spectral position of the resonances and sensitivity. The proposed device is, therefore, highly promising in efficient, highly sensitive, almost lossless, and compact molecular diagnostics in the field of biomedicine with personalized, label-free, early point-of-care diagnosis and field analysis, drug detection, and environmental monitoring.en_US
dc.identifier.doi10.1021/acs.jpcc.9b04748en_US
dc.identifier.issn1932-7447
dc.identifier.urihttp://hdl.handle.net/11693/53374
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttps://dx.doi.org/10.1021/acs.jpcc.9b04748en_US
dc.source.titleJournal of Physical Chemistry Cen_US
dc.subjectThicknessen_US
dc.subjectLayersen_US
dc.subjectQuantum mechanicsen_US
dc.subjectResonance structuresen_US
dc.subjectPolarizationen_US
dc.titleColorimetric and near-absolute polarization-insensitive refractive-index sensing in all-dielectric guided-mode resonance based metasurfaceen_US
dc.typeArticleen_US
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