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Asadchikov VE, Bedin SA, Vasiliev AB, Dyachkova IG, Goldenberg BG, Nazmov VP, Andreev AV, Konovko AA, Reshetov SA. Regular Near-Surface Rod Microstructures and the Generation of Plasmon-Resonance for Detecting Mid-IR Radiation. CRYSTALLOGR REP+ 2021. [DOI: 10.1134/s1063774521030056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Abstract
Antennas are crucial elements for wireless technologies, communications and power transfer across the entire spectrum of electromagnetic waves, including radio, microwaves, THz and optics. In this paper, we review our recent achievements in two promising areas: coherently enhanced wireless power transfer (WPT) and superdirective dielectric antennas. We show that the concept of coherently enhanced WPT allows improvement of the antenna receiving efficiency by coherent excitation of the outcoupling waveguide with a backward propagating guided mode with a specific amplitude and phase. Antennas with the superdirectivity effect can increase the WPT system’s performance in another way, through tailoring of radiation diagram via engineering antenna multipoles excitation and interference of their radiation. We demonstrate a way to achieve the superdirectivity effect via higher-order multipoles excitation in a subwavelength high-index spherical dielectric resonator supporting electric and magnetic Mie multipoles. Thus, both types of antenna discussed here possess a coherent nature and can be used in modern intelligent antenna systems.
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Bag A, Neugebauer M, Woźniak P, Leuchs G, Banzer P. Transverse Kerker Scattering for Angstrom Localization of Nanoparticles. PHYSICAL REVIEW LETTERS 2018; 121:193902. [PMID: 30468586 DOI: 10.1103/physrevlett.121.193902] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Indexed: 05/28/2023]
Abstract
Angstrom precision localization of a single nanoantenna is a crucial step towards advanced nanometrology, medicine, and biophysics. Here, we show that single nanoantenna displacements down to few angstroms can be resolved with sub-angstrom precision using an all-optical method. We utilize the tranverse Kerker scattering scheme where a carefully structured light beam excites a combination of multipolar modes inside a dielectric nanoantenna, which then, upon interference, scatters directionally into the far field. We spectrally tune our scheme such that it is most sensitive to the change in directional scattering per nanoantenna displacement. Finally, we experimentally show that antenna displacement down to 3 Å is resolvable with a localization precision of 0.6 Å.
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Affiliation(s)
- Ankan Bag
- Max Planck Institute for the Science of Light, Staudtstr. 2, D-91058 Erlangen, Germany and Institute of Optics, Information and Photonics, Department of Physics, Friedrich-Alexander-University Erlangen-Nuremberg, Staudtstr. 7/B2, D-91058 Erlangen, Germany
| | - Martin Neugebauer
- Max Planck Institute for the Science of Light, Staudtstr. 2, D-91058 Erlangen, Germany and Institute of Optics, Information and Photonics, Department of Physics, Friedrich-Alexander-University Erlangen-Nuremberg, Staudtstr. 7/B2, D-91058 Erlangen, Germany
| | - Paweł Woźniak
- Max Planck Institute for the Science of Light, Staudtstr. 2, D-91058 Erlangen, Germany and Institute of Optics, Information and Photonics, Department of Physics, Friedrich-Alexander-University Erlangen-Nuremberg, Staudtstr. 7/B2, D-91058 Erlangen, Germany
| | - Gerd Leuchs
- Max Planck Institute for the Science of Light, Staudtstr. 2, D-91058 Erlangen, Germany and Institute of Optics, Information and Photonics, Department of Physics, Friedrich-Alexander-University Erlangen-Nuremberg, Staudtstr. 7/B2, D-91058 Erlangen, Germany
| | - Peter Banzer
- Max Planck Institute for the Science of Light, Staudtstr. 2, D-91058 Erlangen, Germany and Institute of Optics, Information and Photonics, Department of Physics, Friedrich-Alexander-University Erlangen-Nuremberg, Staudtstr. 7/B2, D-91058 Erlangen, Germany
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Blinov LM, Lazarev VV, Yudin SG, Artemov VV, Palto SP, Gorkunov MV. Electro-Optic Effect in Thin Films of a Dielectric and a Ferroelectric with Subwavelength Aluminum Grating. CRYSTALLOGR REP+ 2018. [DOI: 10.1134/s1063774518010030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Kharintsev S, Alekseev A, Loos J. Etchant-based design of gold tip apexes for plasmon-enhanced Raman spectromicroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 171:139-143. [PMID: 27501486 DOI: 10.1016/j.saa.2016.07.048] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Revised: 07/22/2016] [Accepted: 07/31/2016] [Indexed: 06/06/2023]
Abstract
In this paper, we gain insight into the design and optimization of plasmonic (metallic) tips prepared with dc-pulsed voltage electrochemical etching gold wires, provided that, a duty cycle is self-tuned. Physically, it means that etching electrolyte attacks the gold wire equally for all pulse lengths, regardless of its surface shape. Etchant effect on the reproducibility of a curvature radius of the tip apex is demonstrated. It means that the gold conical tips can be designed chemically with a choice of proper etchant electrolyte. It is suggested to use a microtomed binary polymer blend consisting of polyamide and low density polyethylene, as a calibration grating, for optimizing and standardizing tip-enhanced Raman scattering performance.
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Affiliation(s)
- Sergey Kharintsev
- Department of Optics and Nanophotonics, Institute of Physics, Kazan Federal University, Kremlevskaya, 16, Kazan 420008, Russia; Tatarstan Academy of Sciences, Baumana str., 20, Kazan 420111, Russia.
| | - Alexander Alekseev
- National Laboratory Astana, Nazarbayev University, Kabanbay batyr ave., 53, Astana 01000, Kazakhstan; STC NMST, Moscow Institute for Electronic Technology, Moscow, Russia
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