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Oleynik P, Berkmann F, Reiter S, Schlipf J, Ratzke M, Yamamoto Y, Fischer IA. Strong Optical Coupling of Lattice Resonances in a Top-down Fabricated Hybrid Metal-Dielectric Al/Si/Ge Metasurface. Nano Lett 2024; 24:3142-3149. [PMID: 38427383 PMCID: PMC10941247 DOI: 10.1021/acs.nanolett.3c05050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 02/26/2024] [Accepted: 02/27/2024] [Indexed: 03/02/2024]
Abstract
Optical metasurfaces enable the manipulation of the light-matter interaction in ultrathin layers. Compared with their metal or dielectric counterparts, hybrid metasurfaces resulting from the combination of dielectric and metallic nanostructures can offer increased possibilities for interactions between modes present in the system. Here, we investigate the interaction between lattice resonances in a hybrid metal-dielectric metasurface obtained from a single-step nanofabrication process. Finite-difference time domain simulations show the avoided crossing of the modes appearing in the wavelength-dependent absorptance inside the Ge upon variations in a selected geometry parameter as evidence for strong optical coupling. We find good agreement between the measured and simulated absorptance and reflectance spectra. Our metasurface design can be easily incorporated into a top-down optoelectronic device fabrication process with possible applications ranging from on-chip spectroscopy to sensing.
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Affiliation(s)
- Paul Oleynik
- Experimentalphysik
und Funktionale Materialien, Brandenburgische
Technische Universität Cottbus-Senftenberg, Erich-Weinert-Straße 1, 03046, Cottbus, Germany
| | - Fritz Berkmann
- Department
of Physics, Sapienza University of Rome, 00185 Rome, Italy
| | - Sebastian Reiter
- Experimentalphysik
und Funktionale Materialien, Brandenburgische
Technische Universität Cottbus-Senftenberg, Erich-Weinert-Straße 1, 03046, Cottbus, Germany
| | - Jon Schlipf
- Experimentalphysik
und Funktionale Materialien, Brandenburgische
Technische Universität Cottbus-Senftenberg, Erich-Weinert-Straße 1, 03046, Cottbus, Germany
| | - Markus Ratzke
- Experimentalphysik
und Funktionale Materialien, Brandenburgische
Technische Universität Cottbus-Senftenberg, Erich-Weinert-Straße 1, 03046, Cottbus, Germany
| | - Yuji Yamamoto
- IHP−Leibniz
Institut für Innovative Mikroelektronik, Im Technologiepark 25, 15236, Frankfurt (Oder), Germany
| | - Inga Anita Fischer
- Experimentalphysik
und Funktionale Materialien, Brandenburgische
Technische Universität Cottbus-Senftenberg, Erich-Weinert-Straße 1, 03046, Cottbus, Germany
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Temperini ME, Polito R, Intze A, Gillibert R, Berkmann F, Baldassarre L, Giliberti V, Ortolani M. A mid-infrared laser microscope for the time-resolved study of light-induced protein conformational changes. Rev Sci Instrum 2023; 94:064102. [PMID: 37862502 DOI: 10.1063/5.0136676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 05/26/2023] [Indexed: 10/22/2023]
Abstract
We have developed a confocal laser microscope operating in the mid-infrared range for the study of light-sensitive proteins, such as rhodopsins. The microscope features a co-aligned infrared and visible illumination path for the selective excitation and probing of proteins located in the IR focus only. An external-cavity tunable quantum cascade laser provides a wavelength tuning range (5.80-6.35 µm or 1570-1724 cm-1) suitable for studying protein conformational changes as a function of time delay after visible light excitation with a pulsed LED. Using cryogen-free detectors, the relative changes in the infrared absorption of rhodopsin thin films around 10-4 have been observed with a time resolution down to 30 ms. The measured full-width at half maximum of the Airy disk at λ = 6.08 µm in transmission mode with a confocal arrangement of apertures is 6.6 µm or 1.1λ. Dark-adapted sample replacement at the beginning of each photocycle is then enabled by exchanging the illuminated thin-film location with the microscope mapping stage synchronized to data acquisition and LED excitation and by averaging hundreds of time traces acquired in different nearby locations within a homogeneous film area. We demonstrate that this instrument provides crucial advantages for time-resolved IR studies of rhodopsin thin films with a slow photocycle. Time-resolved studies of inhomogeneous samples may also be possible with the presented instrument.
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Affiliation(s)
- Maria Eleonora Temperini
- Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, Rome 00185, Italy
- Center for Life Nano & Neuro Science CL2NS, Istituto Italiano di Tecnologia, Viale Regina Elena 291, Rome 00161, Italy
| | - Raffaella Polito
- Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, Rome 00185, Italy
| | - Antonia Intze
- Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, Rome 00185, Italy
- Center for Life Nano & Neuro Science CL2NS, Istituto Italiano di Tecnologia, Viale Regina Elena 291, Rome 00161, Italy
| | - Raymond Gillibert
- Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, Rome 00185, Italy
| | - Fritz Berkmann
- Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, Rome 00185, Italy
| | - Leonetta Baldassarre
- Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, Rome 00185, Italy
| | - Valeria Giliberti
- Center for Life Nano & Neuro Science CL2NS, Istituto Italiano di Tecnologia, Viale Regina Elena 291, Rome 00161, Italy
| | - Michele Ortolani
- Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, Rome 00185, Italy
- Center for Life Nano & Neuro Science CL2NS, Istituto Italiano di Tecnologia, Viale Regina Elena 291, Rome 00161, Italy
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