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Low-Index-Contrast Dielectric Lattices on Metal for Refractometric Sensing
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Dong, J (författare)
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Chen, S (författare)
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Huang, G (författare)
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Wu, Q (författare)
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Huang, X (författare)
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Wang, L (författare)
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Zhang, Y (författare)
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Ao, X (författare)
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- He, Sailing (författare)
- KTH,Elektroteknisk teori och konstruktion,Optical Network Laboratory (ON Lab)
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(creator_code:org_t)
- 2020-09-02
- 2020
- Engelska.
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Ingår i: Advanced Optical Materials. - : Wiley-VCH Verlag. - 2162-7568 .- 2195-1071.
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- This article reports refractometric sensing using two optical resonances of different types supported by TiO2 nanopillar arrays on a gold film, which can be exposed to aqueous or organic environments. One lattice resonance, with enhanced electric fields extending into the surrounding environment, can maintain a quality factor Q > 200 when the bulk refractive index of the surrounding environment varies in a large range from 1.33 to 1.58. This lattice resonance exhibits not only sharp transitions of reflected light intensity but also rapid phase changes. The other resonance is of plasmonic nature with electric fields localized on the metal surface. Small changes in the bulk refractive index or the adsorbate layer (thickness and index) can be detected, with sensitivity comparable to that of plasmonic counterparts. The present hybrid metal–dielectric platform is promising for applications requiring dielectric instead of metallic sensing surfaces.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Nyckelord
- Dielectric lattices
- Electric fields
- Lattice resonances
- Low index contrast
- Metals
- Nano-pillar arrays
- Optical resonance
- Oxide minerals
- Plasmonics
- Quantum optics
- Reflected light intensity
- Refractive index
- Refractometric sensing
- Resonance
- Surrounding environment
- Titanium dioxide
- hybrid metalâdielectric nanostructures
- lattice resonances
- sensing
- surface modes
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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