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Olohan BJ, Petronijevic E, Kilic U, Wimer S, Hilfiker M, Schubert M, Argyropoulos C, Schubert E, Clowes SR, Pantoş GD, Andrews DL, Valev VK. Chiroptical Second-Harmonic Tyndall Scattering from Silicon Nanohelices. ACS NANO 2024. [PMID: 38881465 DOI: 10.1021/acsnano.4c02006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2024]
Abstract
Chirality is omnipresent in the living world. As biomimetic nanotechnology and self-assembly advance, they too need chirality. Accordingly, there is a pressing need to develop general methods to characterize chiral building blocks at the nanoscale in liquids such as water─the medium of life. Here, we demonstrate the chiroptical second-harmonic Tyndall scattering effect. The effect was observed in Si nanohelices, an example of a high-refractive-index dielectric nanomaterial. For three wavelengths of illumination, we observe a clear difference in the second-harmonic scattered light that depends on the chirality of the nanohelices and the handedness of circularly polarized light. Importantly, we provide a theoretical analysis that explains the origin of the effect and its direction dependence, resulting from different specific contributions of "electric dipole-magnetic dipole" and "electric dipole-electric quadrupole" coupling tensors. Using numerical simulations, we narrow down the number of such terms to 8 in forward scattering and to a single one in right-angled scattering. For chiral scatterers such as high-refractive-index dielectric nanoparticles, our findings expand the Tyndall scattering regime to nonlinear optics. Moreover, our theory can be broadened and adapted to further classes where such scattering has already been observed or is yet to be observed.
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Affiliation(s)
- Ben J Olohan
- Centre of Photonics and Photonic Materials, University of Bath, Bath BA2 7AY, U.K
- Centre of Nanoscience and Nanotechnology, University of Bath, Bath BA2 7AY, U.K
| | | | - Ufuk Kilic
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Shawn Wimer
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Matthew Hilfiker
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Mathias Schubert
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
- Solid State Physics and NanoLund, Lund University, Box 118, Lund, Skane 22100, Sweden
| | - Christos Argyropoulos
- Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16803, United States
| | - Eva Schubert
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Samuel R Clowes
- Department of Chemistry, University of Bath, Bath BA2 7AY, U.K
| | - G Dan Pantoş
- Department of Chemistry, University of Bath, Bath BA2 7AY, U.K
| | - David L Andrews
- Centre for Photonics and Quantum Science, University of East Anglia, Norwich NR4 7TJ, U.K
| | - Ventsislav K Valev
- Centre of Photonics and Photonic Materials, University of Bath, Bath BA2 7AY, U.K
- Centre of Nanoscience and Nanotechnology, University of Bath, Bath BA2 7AY, U.K
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Cheng AC, Pin C, Sunaba Y, Sugiyama T, Sasaki K. Nanoscale Helical Optical Force for Determining Crystal Chirality. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2312174. [PMID: 38586919 DOI: 10.1002/smll.202312174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 03/14/2024] [Indexed: 04/09/2024]
Abstract
The deterministic control of material chirality has been a sought-after goal. As light possesses intrinsic chirality, light-matter interactions offer promising avenues for achieving non-contact, enantioselective optical induction, assembly, or sorting of chiral entities. However, experimental validations are confined to the microscale due to the limited strength of asymmetrical interactions within sub-diffraction limit ranges. In this study, a novel approach is presented to facilitate chirality modulation through chiral crystallization using a helical optical force field originating from localized nanogap surface plasmon resonance. The force field emerges near a gold trimer nanogap and is propelled by linear and angular momentum transfer from the incident light to the resonant nanogap plasmon. By employing Gaussian and Laguerre-Gaussian incident laser beams, notable enantioselectivity is achieved through low-power plasmon-induced chiral crystallization of an organic compound-ethylenediamine sulfate. The findings provide new insights into chirality transmission orchestrated by the exchange of linear and angular momentum between light and nanomaterials.
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Affiliation(s)
- An-Chieh Cheng
- Research Institute for Electronic Science, Hokkaido University, Sapporo, 060-0812, Japan
| | - Christophe Pin
- Research Institute for Electronic Science, Hokkaido University, Sapporo, 060-0812, Japan
| | - Yuji Sunaba
- Research Institute for Electronic Science, Hokkaido University, Sapporo, 060-0812, Japan
| | - Teruki Sugiyama
- Department of Applied Chemistry and Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, 1001 University Rd., Hsinchu, 300093, Taiwan
- Division of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma, Nara, 630-0192, Japan
| | - Keiji Sasaki
- Research Institute for Electronic Science, Hokkaido University, Sapporo, 060-0812, Japan
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Yamanishi J, Ahn HY, Okamoto H. Nanoscopic Observation of Chiro-Optical Force. NANO LETTERS 2023; 23:9347-9352. [PMID: 37792311 PMCID: PMC10607231 DOI: 10.1021/acs.nanolett.3c02534] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 09/24/2023] [Indexed: 10/05/2023]
Abstract
Nanoscopic observation of chiro-optical phenomena is essential in wide scientific areas but has measurement difficulties; hence, its physics is still unknown. To obtain a full understanding of the physics of chiro-optical systems and derive the full potentials, it is essential to perform an in situ observation of the chiro-optical effect from the individual parts because the macroscopic chiro-optical effect cannot be translated directly into microscopic effects. In the present study, we observed the chiro-optical responses at the nanoscale level by detecting the chiro-optical forces, which were generated by illumination of the material-probe system with circularly polarized light. The induced optical force was dependent on the handedness and wavelength of the incident circularly polarized light and was well correlated to the electromagnetically simulated differential intensity of the longitudinal electric field. Our results facilitate the clarification of chiro-optical phenomena at the nanoscale level and could innovate chiro-optical nanotechnologies.
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Affiliation(s)
- Junsuke Yamanishi
- Institute
for Molecular Science, National Institutes
of Natural Sciences, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
| | - Hyo-Yong Ahn
- Institute
for Molecular Science, National Institutes
of Natural Sciences, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
- Center
for Novel Science Initiatives, National
Institutes of Natural Sciences, 4-3-13 Toranomon, Minato-ku, Tokyo 105-0001, Japan
| | - Hiromi Okamoto
- Institute
for Molecular Science, National Institutes
of Natural Sciences, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
- The
Graduate University for Advanced Studies (Sokendai), 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
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Lu J, Ginis V, Lim SWD, Capasso F. Helicity and Polarization Gradient Optical Trapping in Evanescent Fields. PHYSICAL REVIEW LETTERS 2023; 131:143803. [PMID: 37862648 DOI: 10.1103/physrevlett.131.143803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Accepted: 09/13/2023] [Indexed: 10/22/2023]
Abstract
Optical traps using nonconservative forces instead of conservative intensity-gradient forces expand the trap parameter space. Existing traps with nonconservative helicity-dependent forces are limited to chiral particles and fields with helicity gradients. We relax these constraints by proposing helicity and polarization gradient optical trapping of achiral particles in evanescent fields. We further propose an optical switching system in which a microsphere is trapped and optically manipulated around a microfiber using polarization gradients. Our Letter deepens the understanding of light-matter interactions in polarization gradient fields and expands the range of compatible particles and stable trapping fields.
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Affiliation(s)
- Jinsheng Lu
- Harvard John A. Paulson School of Engineering and Applied Sciences, 9 Oxford Street, Cambridge, Massachusetts 02138, USA
| | - Vincent Ginis
- Harvard John A. Paulson School of Engineering and Applied Sciences, 9 Oxford Street, Cambridge, Massachusetts 02138, USA
- Data Lab and Applied Physics, Vrije Universiteit Brussel, 1050 Brussel, Belgium
| | - Soon Wei Daniel Lim
- Harvard John A. Paulson School of Engineering and Applied Sciences, 9 Oxford Street, Cambridge, Massachusetts 02138, USA
| | - Federico Capasso
- Harvard John A. Paulson School of Engineering and Applied Sciences, 9 Oxford Street, Cambridge, Massachusetts 02138, USA
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Yamane H, Yokoshi N, Ishihara H, Oka H. Enantioselective optical trapping of single chiral molecules in the superchiral field vicinity of metal nanostructures. OPTICS EXPRESS 2023; 31:13708-13723. [PMID: 37157253 DOI: 10.1364/oe.482207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
In this study, we theoretically analyzed the optical force acting on single chiral molecules in the plasmon field induced by metallic nanostructures. Using the extended discrete dipole approximation, we quantitatively examined the optical response of single chiral molecules in the localized plasmon by numerically analyzing the internal polarization structure of the molecules obtained from quantum chemical calculations, without phenomenological treatment. We evaluated the chiral gradient force due to the optical chirality gradient of the superchiral field near the metallic nanostructures for chiral molecules. Our calculation method can be used to evaluate the molecular-orientation dependence and rotational torque by considering the chiral spatial structure inside the molecules. We theoretically showed that the superchiral field induced by chiral plasmonic nanostructures can be used to selectively optically capture the enantiomers of a single chiral molecule.
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Yamane H, Yokoshi N, Oka H, Sugawara Y, Ishihara H. Near-field circular dichroism of single molecules. OPTICS EXPRESS 2023; 31:3415-3426. [PMID: 36785335 DOI: 10.1364/oe.476011] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 12/28/2022] [Indexed: 06/18/2023]
Abstract
Near-field images of molecules provide information about their excited orbitals, giving rise to photonic and chemical functions. Such information is crucial to the elucidation of the full potential of molecules as components in functional materials and devices at the nanoscale. However, direct imaging inside single molecules with a complex structure in the near-field is still challenging because it requires in situ observation at a higher resolution than the molecular scale. Here, using a proven theoretical method that has demonstrated sub-nanoscale resolution based on photoinduced force microscopy (PiFM) experiment [Nat. Commun.12, 3865 (2021)10.1038/s41467-021-24136-2], we propose an approach to obtaining the near-field imaging with spatial patterns of electronic transitions of single molecules. We use an extended discrete dipole approximation method that incorporates microscopic nonlocal optical response of molecules and demonstrate that PiFM can visualize circular-dichroism signal patterns at sub-nanometer scale for both optically allowed and forbidden transitions. The result will open the possibility for the direct observation of complex spatial patterns of electronic transitions in a single molecule, providing insight into the optical function of single molecules and helping realize new functional materials and devices.
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