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Mao L, Cheng P, Liu K, Lian M, Cao T. Sieving nanometer enantiomers using bound states in the continuum from the metasurface. NANOSCALE ADVANCES 2022; 4:1617-1625. [PMID: 36134367 PMCID: PMC9419565 DOI: 10.1039/d1na00764e] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 02/07/2022] [Indexed: 06/16/2023]
Abstract
Enantioseparation of chiral molecules is an important aspect of life sciences, chemical syntheses, and physics. Yet, the prevailing chemical techniques are not effective. Recently, a few types of plasmonic apertures have been theoretically proposed to distinguish between chiral molecules that vary based on their handedness under circularly polarized illumination. Both analytic calculations and numerical simulation demonstrated that enantioselective optical sieving could be obtained at the nanoscale using a large chiral optical force based on plasmonic resonance enhanced near-field chiral gradients in the aperture. Nevertheless, scaling this scheme to chiral entities of a few nanometer size (i.e., proteins and DNA) faces formidable challenges owing to the fabrication limit of a deeply sub-nanometer aperture and the intense power levels needed for nanoscale trapping. In contrast, by extending the Friedrich-Wintgen theory of the bound states in the continuum (BIC) to photonics, one may explore another mechanism to obtain enantioselective separation of chiral nanoparticles using all-dielectric nanostructures. Here, we present a metasurface composed of an array of silicon (Si) nanodisks embedded with off-set holes, which supports a sharp high-quality (Q) magnetic dipolar (MD) resonance originating from a distortion of symmetry-protected BIC, so called quasi-BIC. We, for the very first time, show that such a quasi-BIC MD resonance can markedly improve the chiral lateral force on the paired enantiomers with linearly polarized illumination. This quasi-BIC MD resonance can enhance the chirality density gradient with alternating sign at each octant around the Si nanodisk, while exhibiting a small gradient for the electromagnetic (EM) density. This offers a chiral lateral force that is 1 order larger in magnitude compared to the non-chiral lateral forces on sub-2 nm chiral objects with a chirality parameter of ±0.01. Moreover, the quasi-BIC MD resonance can excite four pairs of diverse optical potential wells (-13k B T) that are distributed uniformly along the outer edge of the resonator, enabling a simultaneous separation of four paired enantiomers. Our proposed dielectric metasurface may move forward the techniques of enantioseparation and enantiopurification, taking a novel perspective to advanced all-optical enantiopure synthesis.
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Affiliation(s)
- Libang Mao
- School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology Dalian 116024 China
| | - Peiyuan Cheng
- School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology Dalian 116024 China
| | - Kuan Liu
- School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology Dalian 116024 China
| | - Meng Lian
- School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology Dalian 116024 China
| | - Tun Cao
- School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology Dalian 116024 China
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2
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Wang M, Li H, Xu T, Li G, Yu M, Jiang B, Xu J, Wu J. Probing a chiral drug using long period fiber gratings. OPTICS EXPRESS 2019; 27:31407-31417. [PMID: 31684375 DOI: 10.1364/oe.27.031407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 09/20/2019] [Indexed: 06/10/2023]
Abstract
The electromagnetic field theory for a step-index fiber geometry is developed to sense a surrounding chiral drug via long-period fiber gratings (LPFGs). This theory employs Debye potentials and electromagnetic fields for cladding modes in the LPFGs by introducing constitutive relations for a chiral drug. The fields in the chiral drug are transformed and decomposed into right- and left-hand circularly polarized components to account for the magnetoelectric coupling due to the chirality. The solving process for complex propagation constants is given. Numerical results show that responses of the LPFGs to refractive index and chirality changes are different. The two minimum transmissions of a coated LPFG are very sensitive to the variation of the complex chirality. On the other hand, the two resonance wavelengths keep invariant as real and imaginary parts of the comparatively small chirality change. This work enriches the electromagnetic field theory for better design of LPFGs against the highly sensitive chirality detection.
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Wang M, Li H, Xu T, Zheng H, Yu M, Li G, Xu J, Wu J. Probing bianisotropic biomolecules via a surface plasmon resonance sensor. OPTICS EXPRESS 2018; 26:28277-28287. [PMID: 30470002 DOI: 10.1364/oe.26.028277] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Accepted: 09/03/2018] [Indexed: 06/09/2023]
Abstract
The transfer matrix method is developed to probe bianisotropic biomolecules via a Kretschmann configuration surface plasmon resonance (SPR) sensor. This method employs wave vectors and 4 × 4 transfer matrices derived by using anisotropic and magnetoelectric coupling constitutive relations. The transfer matrices relate four eigenstates and trace four transverse field components through the multilayer to account for cross-polarization coupling due to the chirality of the biomolecule layer. The validity of the method is confirmed by means of numerical results. It is shown that cross-polarized reflection waves are enhanced around the SPR angle, as the water solution and bianisotropic biomolecules to be detected are placed in contact with the graphene layer of the sensor. The effects of optical activity and bianisotropy on the SPR sensor are investigated. This work enriches the transfer matrix theory for SPR sensors to detect the chirality parameter of bianisotropic chiral material, and may lead to a better design of SPR sensors against the chirality parameter variation.
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Zhu T, Cao Y, Wang L, Nie Z, Cao T, Sun F, Jiang Z, Nieto-Vesperinas M, Liu Y, Qiu CW, Ding W. Self-Induced Backaction Optical Pulling Force. PHYSICAL REVIEW LETTERS 2018; 120:123901. [PMID: 29694063 DOI: 10.1103/physrevlett.120.123901] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2017] [Indexed: 05/16/2023]
Abstract
We achieve long-range and continuous optical pulling in a periodic photonic crystal background, which supports a unique Bloch mode with the self-collimation effect. Most interestingly, the pulling force reported here is mainly contributed by the intensity gradient force originating from the self-induced backaction of the object to the self-collimation mode. This force is sharply distinguished from the widely held conception of optical tractor beams based on the scattering force. Also, this pulling force is insensitive to the angle of incidence and can pull multiple objects simultaneously.
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Affiliation(s)
- Tongtong Zhu
- Department of Physics, Harbin Institute of Technology, Harbin 150001, China
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583, Singapore
| | - Yongyin Cao
- Department of Physics, Harbin Institute of Technology, Harbin 150001, China
| | - Lin Wang
- Department of Physics, Harbin Institute of Technology, Harbin 150001, China
| | - Zhongquan Nie
- Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China
| | - Tun Cao
- Department of Biomedical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Fangkui Sun
- Department of Physics, Harbin Institute of Technology, Harbin 150001, China
| | - Zehui Jiang
- Department of Physics, Harbin Institute of Technology, Harbin 150001, China
| | - Manuel Nieto-Vesperinas
- Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Campus de Cantoblanco, Madrid 28049, Spain
| | - Yongmin Liu
- Departments of Mechanical and Industrial Engineering and Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115, USA
| | - Cheng-Wei Qiu
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583, Singapore
| | - Weiqiang Ding
- Department of Physics, Harbin Institute of Technology, Harbin 150001, China
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Mahdy MRC, Danesh M, Zhang T, Ding W, Rivy HM, Chowdhury AB, Mehmood MQ. Plasmonic Spherical Heterodimers: Reversal of Optical Binding Force Based on the Forced Breaking of Symmetry. Sci Rep 2018; 8:3164. [PMID: 29453371 PMCID: PMC5816674 DOI: 10.1038/s41598-018-21498-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 02/05/2018] [Indexed: 11/09/2022] Open
Abstract
The stimulating connection between the reversal of near-field plasmonic binding force and the role of symmetry-breaking has not been investigated comprehensively in the literature. In this work, the symmetry of spherical plasmonic heterodimer-setup is broken forcefully by shining the light from a specific side of the set-up instead of impinging it from the top. We demonstrate that for the forced symmetry-broken spherical heterodimer-configurations: reversal of lateral and longitudinal near-field binding force follow completely distinct mechanisms. Interestingly, the reversal of longitudinal binding force can be easily controlled either by changing the direction of light propagation or by varying their relative orientation. This simple process of controlling binding force may open a novel generic way of optical manipulation even with the heterodimers of other shapes. Though it is commonly believed that the reversal of near-field plasmonic binding force should naturally occur for the presence of bonding and anti-bonding modes or at least for the Fano resonance (and plasmonic forces mostly arise from the surface force), our study based on Lorentz-force dynamics suggests notably opposite proposals for the aforementioned cases. Observations in this article can be very useful for improved sensors, particle clustering and aggregation.
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Affiliation(s)
- M R C Mahdy
- Department of Electrical & Computer Engineering, North South University, Bashundhara, Dhaka, 1229, Bangladesh.
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, 117583, Singapore, Singapore.
- Pi Labs Bangladesh Ltd., ARA Bhaban, 39, Kazi Nazrul Islam Avenue, Kawran Bazar, Dhaka, Bangladesh.
| | - Md Danesh
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, 117583, Singapore, Singapore
| | - Tianhang Zhang
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, 117583, Singapore, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 28 Medical Drive, Singapore, 117456, Singapore
| | - Weiqiang Ding
- Department of Physics, Harbin Institute of Technology, Harbin, 150001, People's Republic of China.
| | - Hamim Mahmud Rivy
- Department of Electrical & Computer Engineering, North South University, Bashundhara, Dhaka, 1229, Bangladesh
| | - Ariful Bari Chowdhury
- Department of Public Health, North South University, Bashundhara, Dhaka, 1229, Bangladesh
| | - M Q Mehmood
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, 117583, Singapore, Singapore
- Department of Electrical Engineering, Information Technology University of the Punjab, 54000, Lahore, Pakistan
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Sukhov S, Dogariu A. Non-conservative optical forces. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2017; 80:112001. [PMID: 28762956 DOI: 10.1088/1361-6633/aa834e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Undoubtedly, laser tweezers are the most recognized application of optically induced mechanical action. Their operation is usually described in terms of conservative forces originating from intensity gradients. However, the fundamental optical action on matter is non-conservative. We will review different manifestations of non-conservative optical forces (NCF) and discuss their dependence on the specific spatial properties of optical fields that generate them. New developments relevant to the NCF such as tractor beams and transversal forces are also discussed.
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Affiliation(s)
- Sergey Sukhov
- CREOL, The College of Optics and Photonics, University of Central Florida, 4000 Central Florida Blvd., Orlando, FL 32816, United States of America
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Mahdy MRC, Zhang T, Danesh M, Ding W. Substrate and Fano Resonance Effects on the Reversal of Optical Binding Force between Plasmonic Cube Dimers. Sci Rep 2017; 7:6938. [PMID: 28761075 PMCID: PMC5537282 DOI: 10.1038/s41598-017-07158-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 07/06/2017] [Indexed: 11/09/2022] Open
Abstract
The behavior of Fano resonance and the reversal of near field optical binding force of dimers over different substrates have not been studied so far. Notably, for particle clustering and aggregation, controlling the near filed binding force can be a key factor. In this work, we observe that if the closely located plasmonic cube homodimers over glass or high permittivity dielectric substrate are illuminated with plane wave, no reversal of lateral optical binding force occurs. But if we apply the same set-up over a plasmonic substrate, stable Fano resonance occurs along with the reversal of near field lateral binding force. It is observed that during such Fano resonance, stronger coupling occurs between the dimers and plasmonic substrate along with the strong enhancement of the substrate current. Such binding force reversals of plasmonic cube dimers have been explained based on the observed unusual behavior of optical Lorentz force during the induced stronger Fano resonance and the dipole-dipole resonance. Although previously reported reversals of near field optical binding forces were highly sensitive to particle size/shape (i.e. for heterodimers) and inter-particle distance, our configuration provides much relaxation of those parameters and hence could be verified experimentally with simpler experimental set-ups.
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Affiliation(s)
- M R C Mahdy
- Department of Electrical & Computer Engineering, North South University, Bashundhara, Dhaka, 1229, Bangladesh.
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore, 4 Engineering Drive 3, 117583, Singapore.
- Pi Labs Bangladesh LTD, ARA Bhaban, Kawran Bazar, 39, Kazi Nazrul Islam Avenue, Dhaka, Bangladesh.
| | - Tianhang Zhang
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore, 4 Engineering Drive 3, 117583, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore, 28 Medical Drive, 117456, Singapore
| | - Md Danesh
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore, 4 Engineering Drive 3, 117583, Singapore
- Transcelestial Technologies, 32 Carpenter Street, Singapore, 059911, Singapore
| | - Weiqiang Ding
- Department of Physics, Harbin Institute of Technology, Harbin, 150001, People's Republic of China.
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Zhu T, Mahdy MRC, Cao Y, Lv H, Sun F, Jiang Z, Ding W. Optical pulling using evanescent mode in sub-wavelength channels. OPTICS EXPRESS 2016; 24:18436-18444. [PMID: 27505807 DOI: 10.1364/oe.24.018436] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Optical evanescent wave in total internal reflection has been widely used in efficient optical manipulation, where the object is trapped by the intrinsic intensity gradient of the evanescent wave while transported by the scattering force along the orthogonal direction. Here, we propose a distinct optical manipulation scheme using the attenuated modes in subwavelength optical channels, where both the trapping and transportation forces are along the channel direction. We create such a mode in a sub-wavelength photonic crystal waveguide and quantitatively obtain the net pushing and pulling forces, which can overcome the Brownian motion within a critical length. Due to the presence of the physical channel, subwavelength trapping on the transverse direction is natural, and manipulation along bend trajectories is also possible without the assistance of the self-acceleration beams provided a channel is adopted. This optical manipulation method can be extended to any other channels that support attenuation mode, and may provide an alternate way for flexible optical manipulation.
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