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Saemisch L, van Hulst NF, Liebel M. One-Shot Phase Image Distinction of Plasmonic and Dielectric Nanoparticles. NANO LETTERS 2021; 21:4021-4028. [PMID: 33899486 DOI: 10.1021/acs.nanolett.1c00866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Nanoscale phase control is one of the most powerful approaches to specifically tailor electrical fields in modern nanophotonics. Especially the precise subwavelength assembly of many individual nanobuilding blocks has given rise to exciting new materials as diverse as metamaterials, for miniaturizing optics, or 3D assembled plasmonic structures for biosensing applications. Despite its fundamental importance, the phase response of individual nanostructures is experimentally extremely challenging to visualize. Here, we address this shortcoming and measure the quantitative scattering phase of different nanomaterials such as gold nanorods and spheres as well as dielectric nanoparticles. Beyond reporting spectrally resolved responses, with phase changes close to π when passing the particles' plasmon resonance, we devise a simple method for distinguishing different plasmonic and dielectric particles purely based on their phase behavior. Finally, we integrate this novel approach in a single-shot two-color scheme, capable of directly identifying different types of nanoparticles on one sample, from a single widefield image.
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Affiliation(s)
- Lisa Saemisch
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain
| | - Niek F van Hulst
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain
- ICREA-Institució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain
| | - Matz Liebel
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain
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Zissi GD, Angelis G, Pampalakis G. The Generation and Study of a Gold‐Based Chemobrionic Plant‐Like Structure. CHEMSYSTEMSCHEM 2020. [DOI: 10.1002/syst.202000018] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Georgia D. Zissi
- Department of Pharmacy University of Patras Panepistimioupolis, Rion Patras 26504 Greece
| | - George Angelis
- Department of Pharmacognosy-Pharmacology Aristotle University Thessaloniki Thessaloniki 54124 Greece
| | - Georgios Pampalakis
- Department of Pharmacognosy-Pharmacology Aristotle University Thessaloniki Thessaloniki 54124 Greece
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Wackenhut F, Jakob LA, Hauler O, Stuhl A, Laible F, Fleischer M, Braun K, Meixner AJ. Nanoscale plasmonic phase sensor. Anal Bioanal Chem 2020; 412:3405-3411. [PMID: 31919613 DOI: 10.1007/s00216-019-02340-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 12/03/2019] [Accepted: 12/09/2019] [Indexed: 12/30/2022]
Abstract
Using the localized surface plasmon resonance (LSPR) of gold nanoparticles for sensing applications has attracted considerable interest, since it can be very sensitive, even down to a single molecule, and selective for a specific analyte molecule with a suitable surface modification. LSPR sensing is usually based on the wavelength shift of the LSPR or a Fano resonance. Here, we present a new experimental approach based on the phase of the light scattered by a single gold nanoparticle by equipping a confocal microscope with an additional interferometer arm similar to a Michelson interferometer. The detected phase depends on the shape of the nanoparticle and the refractive index of the surrounding medium and can even be detected for off-resonant excitation. This can be used as a new and sensitive detection method in LSPR sensing, allowing the detection of changes to the local refractive index or the binding of molecules to the nanoparticle surface.
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Affiliation(s)
- Frank Wackenhut
- Institute of Physical and Theoretical Chemistry, Eberhard Karls University, Auf der Morgenstelle 18, 72076, Tuebingen, Germany.
| | - Lukas A Jakob
- Institute of Physical and Theoretical Chemistry, Eberhard Karls University, Auf der Morgenstelle 18, 72076, Tuebingen, Germany
| | - Otto Hauler
- Institute of Physical and Theoretical Chemistry, Eberhard Karls University, Auf der Morgenstelle 18, 72076, Tuebingen, Germany
| | - Alexander Stuhl
- Institute of Physical and Theoretical Chemistry, Eberhard Karls University, Auf der Morgenstelle 18, 72076, Tuebingen, Germany
| | - Florian Laible
- Institute for Applied Physics, Eberhard Karls University, Auf der Morgenstelle 10, 72076, Tuebingen, Germany
- Center for Light-Matter-Interaction, Sensors and Analytics LISA+, Eberhard Karls University, Auf der Morgenstelle 15, 72076, Tuebingen, Germany
| | - Monika Fleischer
- Institute for Applied Physics, Eberhard Karls University, Auf der Morgenstelle 10, 72076, Tuebingen, Germany
- Center for Light-Matter-Interaction, Sensors and Analytics LISA+, Eberhard Karls University, Auf der Morgenstelle 15, 72076, Tuebingen, Germany
| | - Kai Braun
- Institute of Physical and Theoretical Chemistry, Eberhard Karls University, Auf der Morgenstelle 18, 72076, Tuebingen, Germany
- Center for Light-Matter-Interaction, Sensors and Analytics LISA+, Eberhard Karls University, Auf der Morgenstelle 15, 72076, Tuebingen, Germany
| | - Alfred J Meixner
- Institute of Physical and Theoretical Chemistry, Eberhard Karls University, Auf der Morgenstelle 18, 72076, Tuebingen, Germany.
- Center for Light-Matter-Interaction, Sensors and Analytics LISA+, Eberhard Karls University, Auf der Morgenstelle 15, 72076, Tuebingen, Germany.
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