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      Wide-range robust wireless power transfer using heterogeneously coupled and flippable neutrals in parity-time symmetry

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          Abstract

          Recently, stationary wireless power transfer (WPT) has been widely adopted in commercial devices. However, the current WPT configuration is limited in its operational area and susceptible to operating condition changes, impeding its applications for dynamic environments. To overcome the limitations, we propose a WPT system with laterally aligned neutral elements in parity-time (PT) symmetry, which can widen the operational area with the number of neutrals N. Compared to the conventional multiple-input–single-output WPT, the dimension of system complexity is substantially reduced from R × C N to R N+1 because the neutral amplitudes are simply controlled by coupling capacitors. The operational frequency is automatically adjusted to a real eigenvalue of the PT-symmetric system to achieve high voltage gain and efficiency, making the system robust. The performance of the system calculated by the coupled-mode theory was experimentally verified with rigid and flexible types of receivers, confirming its potential in both industrial and biomedical electronics.

          Abstract

          Abstract

          Wireless power delivery using multiple neutrals to widen the operational area with minimal system complexity.

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          Most cited references48

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          Soft, stretchable, fully implantable miniaturized optoelectronic systems for wireless optogenetics

          Optogenetics allows rapid, temporally specific control of neuronal activity via targeted expression and activation of light-sensitive proteins. Implementation typically requires remote light sources and fiber-optic delivery schemes that impose significant physical constraints on natural behaviors. In this report we bypass these limitations using novel technologies that combine thin, mechanically soft neural interfaces with fully implantable, stretchable wireless radio power and control systems. The resulting devices achieve optogenetic modulation of the spinal cord and peripheral nervous system. This is demonstrated with two form factors; stretchable film appliques that interface directly with peripheral nerves, and flexible filaments that insert into the narrow confines of the spinal epidural space. These soft, thin devices are minimally invasive, and histological tests suggest they can be used in chronic studies. We demonstrate the power of this technology by modulating peripheral and spinal pain circuitry, providing evidence for the potential widespread use of these devices in research and future clinical applications of optogenetics outside the brain.
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            Unidirectional invisibility induced by PT-symmetric periodic structures.

            Parity-time (PT) symmetric periodic structures, near the spontaneous PT-symmetry breaking point, can act as unidirectional invisible media. In this regime, the reflection from one end is diminished while it is enhanced from the other. Furthermore, the transmission coefficient and phase are indistinguishable from those expected in the absence of a grating. The phenomenon is robust even in the presence of Kerr nonlinearities, and it can also effectively suppress optical bistabilities. © 2011 American Physical Society
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              Biodegradable and flexible arterial-pulse sensor for the wireless monitoring of blood flow

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                Author and article information

                Contributors
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SoftwareRole: SupervisionRole: ValidationRole: VisualizationRole: Writing - original draftRole: Writing - review & editing
                Role: ConceptualizationRole: Data curationRole: InvestigationRole: Project administrationRole: ResourcesRole: SupervisionRole: ValidationRole: VisualizationRole: Writing - original draftRole: Writing - review & editing
                Role: ConceptualizationRole: Data curationRole: InvestigationRole: Project administrationRole: ResourcesRole: SupervisionRole: ValidationRole: VisualizationRole: Writing - original draftRole: Writing - review & editing
                Role: ConceptualizationRole: MethodologyRole: SoftwareRole: Writing - original draft
                Role: InvestigationRole: Methodology
                Role: Data curationRole: InvestigationRole: ResourcesRole: ValidationRole: Visualization
                Role: Methodology
                Role: ConceptualizationRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: SupervisionRole: Validation
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: MethodologyRole: Project administrationRole: ResourcesRole: SoftwareRole: SupervisionRole: Writing - original draftRole: Writing - review & editing
                Journal
                Sci Adv
                Sci Adv
                sciadv
                advances
                Science Advances
                American Association for the Advancement of Science
                2375-2548
                June 2022
                15 June 2022
                : 8
                : 24
                : eabo4610
                Affiliations
                [1 ]Department of Electronic Engineering, Kyung Hee University, Yongin-si 17104, Republic of Korea.
                [2 ]Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea.
                [3 ]School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea.
                [4 ]Department of Electronics and Information Convergence Engineering, Kyung Hee University, Yongin-si 17104, Republic of Korea.
                [5 ]Institute for Wearable Convergence Electronics, Kyung Hee University, Yongin-si 17104, Republic of Korea.
                [6 ]Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
                Author notes
                [* ]Corresponding author. Email: sanghoek@ 123456khu.ac.kr (S.K.); dkim98@ 123456snu.ac.kr (D.-H.K.)
                [†]

                These authors contributed equally to this work.

                Author information
                https://orcid.org/0000-0002-3213-2660
                https://orcid.org/0000-0002-8934-6184
                https://orcid.org/0000-0002-5122-4202
                https://orcid.org/0000-0003-4685-4565
                https://orcid.org/0000-0001-9612-0928
                https://orcid.org/0000-0002-4722-1893
                https://orcid.org/0000-0002-3268-7287
                Article
                abo4610
                10.1126/sciadv.abo4610
                9200287
                35704586
                f3ef4eba-df35-46cc-acfb-959b9661ee77
                Copyright © 2022 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).

                This is an open-access article distributed under the terms of the Creative Commons Attribution license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 04 February 2022
                : 02 May 2022
                Funding
                Funded by: FundRef http://dx.doi.org/10.13039/501100003725, National Research Foundation of Korea;
                Award ID: NRF-2018R1A6A1A03025708
                Funded by: FundRef http://dx.doi.org/10.13039/501100010418, Institute for Information and communications Technology Promotion;
                Award ID: IITP-2021-0-02046
                Funded by: FundRef http://dx.doi.org/10.13039/501100010446, Institute for Basic Science;
                Award ID: IBS-R006-A1
                Categories
                Research Article
                Physical and Materials Sciences
                SciAdv r-articles
                Applied Physics
                Engineering
                Engineering
                Custom metadata
                Nicole Falcasantos

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