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Zheng X. Dedicated Boundary Element Modeling for Nanoparticle‐on‐Mirror Structures Incorporating Nonlocal Hydrodynamic Effects. ADVANCED THEORY AND SIMULATIONS 2022. [DOI: 10.1002/adts.202200480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xuezhi Zheng
- The WaveCore Division Department of Electrical Engineering (ESAT) KU Leuven Leuven B‐3001 Belgium
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2
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Zheng X, Mystilidis C, Xomalis A, Vandenbosch GAE. A Boundary Integral Equation Formalism for Modeling Multiple Scattering of Light from 3D Nanoparticles Incorporating Nonlocal Effects. ADVANCED THEORY AND SIMULATIONS 2022. [DOI: 10.1002/adts.202200485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xuezhi Zheng
- WaveCore Division Department of Electrical Engineering, KU Leuven Kasteelpark Arenberg 10, BUS 2444 Leuven B‐3001 Belgium
| | - Christos Mystilidis
- WaveCore Division Department of Electrical Engineering, KU Leuven Kasteelpark Arenberg 10, BUS 2444 Leuven B‐3001 Belgium
| | - Angelos Xomalis
- Empa, Swiss Federal Laboratories for Materials Science and Technology Feuerwerkerstrasse 39 Thun CH‐3602 Switzerland
| | - Guy A. E. Vandenbosch
- WaveCore Division Department of Electrical Engineering, KU Leuven Kasteelpark Arenberg 10, BUS 2444 Leuven B‐3001 Belgium
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3
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Kupresak M, Zheng X, Mittra R, Vandenbosch GAE, Moshchalkov VV. Nonlocal response of plasmonic core-shell nanotopologies excited by dipole emitters. NANOSCALE ADVANCES 2022; 4:2346-2355. [PMID: 36133694 PMCID: PMC9419619 DOI: 10.1039/d1na00726b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 04/23/2022] [Indexed: 06/16/2023]
Abstract
In light of the emergence of nonclassical effects, a paradigm shift in the conventional macroscopic treatment is required to accurately describe the interaction between light and plasmonic structures with deep-nanometer features. Towards this end, several nonlocal response models, supplemented by additional boundary conditions, have been introduced, investigating the collective motion of the free electron gas in metals. The study of the dipole-excited core-shell nanoparticle has been performed, by employing the following models: the hard-wall hydrodynamic model; the quantum hydrodynamic model; and the generalized nonlocal optical response. The analysis is conducted by investigating the near and far field characteristics of the emitter-nanoparticle system, while considering the emitter outside and inside the studied topology. It is shown that the above models predict striking spectral features, strongly deviating from the results obtained via the classical approach, for both simple and noble constitutive metals.
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Affiliation(s)
- Mario Kupresak
- Department of Electrical Engineering, KU Leuven Kasteelpark Arenberg 10 Bus 2444 3001 Leuven Belgium
| | - Xuezhi Zheng
- Department of Electrical Engineering, KU Leuven Kasteelpark Arenberg 10 Bus 2444 3001 Leuven Belgium
| | - Raj Mittra
- Department of Electrical and Computer Engineering, University of Central Florida Orlando FL 32816-2993 USA
- Department of Electrical and Computer Engineering, King Abdulaziz University Jeddah 21589 Saudi Arabia
| | - Guy A E Vandenbosch
- Department of Electrical Engineering, KU Leuven Kasteelpark Arenberg 10 Bus 2444 3001 Leuven Belgium
| | - Victor V Moshchalkov
- Institute for Nanoscale Physics and Chemistry, KU Leuven Celestijnenlaan 200D 3001 Leuven Belgium
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4
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Ohnoutek L, Olohan BJ, Jones RR, Zheng X, Jeong HH, Valev VK. Second harmonic Rayleigh scattering optical activity of single Ag nanohelices in a liquid. NANOSCALE 2022; 14:3888-3898. [PMID: 35212336 DOI: 10.1039/d1nr06800h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Determining the chirality of molecules and nanoparticles often relies on circular dichroism and optical rotation: two chiral optical (chiroptical) effects in the linear optical regime. Although these linear effects are weak compared to nonlinear chiroptical effects, they have the advantage of being measured in isotropic liquids - free from the complications of anisotropy. Recently, a nonlinear effect: hyper-Rayleigh scattering optical activity (HRS OA) has been shown to reliably distinguish between the two chiral forms of Ag nanohelices, suspended in isotropic liquids. However, this first demonstration of HRS OA also opened new questions. For instance, at a fundamental level, it is not clear what the role of interactions between nanoparticles is. Moreover, the influence of the ultrafast pulse chirp is unknown. Here, we demonstrate HRS OA from well below two Ag nanohelices in the illumination volume, precluding any interactions. Additionally, we performed the first measurements of HRS depolarization ratios in this system and find a value of ≈1. We also show that HRS is highly robust against the chirp of the ultrafast pulses. An important reason for the strong (down to single nanohelix) sensitivity of our experiments is the large chiroptical interaction at the fundamental frequency; this point is illustrated with two sets of numerical simulations of the electromagnetic near-fields. Our results highlight HRS OA as a highly sensitive experimental method for characterization of chiral solutions/suspensions, in tiny illumination volumes.
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Affiliation(s)
- Lukas Ohnoutek
- Centre for Photonics and Photonic Materials, University of Bath, Bath, BA2 7AY, UK
- Centre for Nanoscience and Nanotechnology, University of Bath, Bath, BA2 7AY, UK
- Centre for Therapeutic Innovation, University of Bath, Bath, BA2 7AY, UK.
| | - Ben J Olohan
- Centre for Photonics and Photonic Materials, University of Bath, Bath, BA2 7AY, UK
- Centre for Nanoscience and Nanotechnology, University of Bath, Bath, BA2 7AY, UK
- Centre for Therapeutic Innovation, University of Bath, Bath, BA2 7AY, UK.
| | - Robin R Jones
- Centre for Photonics and Photonic Materials, University of Bath, Bath, BA2 7AY, UK
- Centre for Nanoscience and Nanotechnology, University of Bath, Bath, BA2 7AY, UK
- Centre for Therapeutic Innovation, University of Bath, Bath, BA2 7AY, UK.
| | - Xuezhi Zheng
- Department of Electrical Engineering (ESAT), WaveCore Division, KU Leuven, Kasteelpark Arenberg 10, BUS 2444, Leuven, B-3001, Belgium
| | - Hyeon-Ho Jeong
- Max Planck Institute for Intelligent Systems, 70569 Stuttgart, Germany
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, 61005 Gwangju, Republic of Korea
| | - Ventsislav K Valev
- Centre for Photonics and Photonic Materials, University of Bath, Bath, BA2 7AY, UK
- Centre for Nanoscience and Nanotechnology, University of Bath, Bath, BA2 7AY, UK
- Centre for Therapeutic Innovation, University of Bath, Bath, BA2 7AY, UK.
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5
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Kupresak M, Zheng X, Mittra R, Sipus Z, Vandenbosch GAE, Moshchalkov VV. Single‐Molecule Fluorescence Enhancement by Plasmonic Core–Shell Nanostructures Incorporating Nonlocal Effects. ADVANCED THEORY AND SIMULATIONS 2022. [DOI: 10.1002/adts.202100558] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Mario Kupresak
- Department of Electrical Engineering KU Leuven Kasteelpark Arenberg 10 Leuven 3001 Belgium
| | - Xuezhi Zheng
- Department of Electrical Engineering KU Leuven Kasteelpark Arenberg 10 Leuven 3001 Belgium
| | - Raj Mittra
- Department of Electrical and Computer Engineering University of Central Florida Orlando FL 32816‐2993 USA
- Department of Electrical and Computer Engineering King Abdulaziz University Jeddah 21589 Saudi Arabia
| | - Zvonimir Sipus
- Faculty of Electrical Engineering and Computing University of Zagreb Unska 3 Zagreb 10000 Croatia
| | - Guy A. E. Vandenbosch
- Department of Electrical Engineering KU Leuven Kasteelpark Arenberg 10 Leuven 3001 Belgium
| | - Victor V. Moshchalkov
- Institute for Nanoscale Physics and Chemistry KU Leuven Celestijnenlaan 200D Leuven 3001 Belgium
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Xomalis A, Zheng X, Chikkaraddy R, Koczor-Benda Z, Miele E, Rosta E, Vandenbosch GAE, Martínez A, Baumberg JJ. Detecting mid-infrared light by molecular frequency upconversion in dual-wavelength nanoantennas. Science 2021; 374:1268-1271. [PMID: 34855505 DOI: 10.1126/science.abk2593] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Angelos Xomalis
- NanoPhotonics Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge, UK
| | - Xuezhi Zheng
- NanoPhotonics Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge, UK.,Department of Electrical Engineering (ESAT-TELEMIC), KU Leuven, Leuven, Belgium
| | - Rohit Chikkaraddy
- NanoPhotonics Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge, UK
| | | | - Ermanno Miele
- NanoPhotonics Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge, UK.,Department of Chemistry, University of Cambridge, Cambridge, UK.,The Faraday Institution, Harwell Science and Innovation Campus, Oxford, UK
| | - Edina Rosta
- Department of Physics and Astronomy, University College London, London, UK
| | - Guy A E Vandenbosch
- Department of Electrical Engineering (ESAT-TELEMIC), KU Leuven, Leuven, Belgium
| | - Alejandro Martínez
- Nanophotonics Technology Center, Universitat Politècnica de València, Valencia, Spain
| | - Jeremy J Baumberg
- NanoPhotonics Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge, UK
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Xomalis A, Zheng X, Demetriadou A, Martínez A, Chikkaraddy R, Baumberg JJ. Interfering Plasmons in Coupled Nanoresonators to Boost Light Localization and SERS. NANO LETTERS 2021; 21:2512-2518. [PMID: 33705151 PMCID: PMC7995252 DOI: 10.1021/acs.nanolett.0c04987] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 03/01/2021] [Indexed: 05/27/2023]
Abstract
Plasmonic self-assembled nanocavities are ideal platforms for extreme light localization as they deliver mode volumes of <50 nm3. Here we show that high-order plasmonic modes within additional micrometer-scale resonators surrounding each nanocavity can boost light localization to intensity enhancements >105. Plasmon interference in these hybrid microresonator nanocavities produces surface-enhanced Raman scattering (SERS) signals many-fold larger than in the bare plasmonic constructs. These now allow remote access to molecules inside the ultrathin gaps, avoiding direct irradiation and thus preventing molecular damage. Combining subnanometer gaps with micrometer-scale resonators places a high computational demand on simulations, so a generalized boundary element method (BEM) solver is developed which requires 100-fold less computational resources to characterize these systems. Our results on extreme near-field enhancement open new potential for single-molecule photonic circuits, mid-infrared detectors, and remote spectroscopy.
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Affiliation(s)
- Angelos Xomalis
- NanoPhotonics
Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, United Kingdom
| | - Xuezhi Zheng
- NanoPhotonics
Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, United Kingdom
- Department
of Electrical Engineering (ESAT-TELEMIC), KU Leuven, Kasteelpark Arenberg 10, BUS 2444, 3001 Leuven, Belgium
| | - Angela Demetriadou
- School
of Physics and Astronomy, University of
Birmingham, Birmingham B15 2TT, United Kingdom
| | - Alejandro Martínez
- Nanophotonics
Technology Center, Universitat Politècnica
de València, Valencia 46022, Spain
| | - Rohit Chikkaraddy
- NanoPhotonics
Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, United Kingdom
| | - Jeremy J. Baumberg
- NanoPhotonics
Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, United Kingdom
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8
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Kupresak M, Zheng X, Vandenbosch GAE, Moshchalkov VV. Appropriate Nonlocal Hydrodynamic Models for the Characterization of Deep‐Nanometer Scale Plasmonic Scatterers. ADVANCED THEORY AND SIMULATIONS 2019. [DOI: 10.1002/adts.201900172] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Mario Kupresak
- Department of Electrical Engineering (ESAT‐TELEMIC) KU Leuven Kasteelpark Arenberg 10 bus 2444 3001 Leuven Belgium
| | - Xuezhi Zheng
- Department of Electrical Engineering (ESAT‐TELEMIC) KU Leuven Kasteelpark Arenberg 10 bus 2444 3001 Leuven Belgium
| | - Guy A. E. Vandenbosch
- Department of Electrical Engineering (ESAT‐TELEMIC) KU Leuven Kasteelpark Arenberg 10 bus 2444 3001 Leuven Belgium
| | - Victor V. Moshchalkov
- Institute for Nanoscale Physics and Chemistry (INPAC)KU Leuven Celestijnenlaan 200D 3001 Leuven Belgium
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