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Kokin E, An HJ, Koo D, Han S, Whang K, Kang T, Choi I, Lee LP. Quantum Electrodynamic Behavior of Chlorophyll in a Plasmonic Nanocavity. NANO LETTERS 2022; 22:9861-9868. [PMID: 36484527 DOI: 10.1021/acs.nanolett.2c02917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Plasmonic nanocavities have been used as a novel platform for studying strong light-matter coupling, opening access to quantum chemistry, material science, and enhanced sensing. However, the biomolecular study of cavity quantum electrodynamics (QED) is lacking. Here, we report the quantum electrodynamic behavior of chlorophyll-a in a plasmonic nanocavity. We construct an extreme plasmonic nanocavity using Au nanocages with various linker molecules and Au mirrors to obtain a strong coupling regime. Plasmon resonance energy transfer (PRET)-based hyperspectral imaging is applied to study the electrodynamic behaviors of chlorophyll-a in the nanocavity. Furthermore, we observe the energy level splitting of chlorophyll-a, similar to the cavity QED effects due to the light-matter interactions in the cavity. Our study will provide insight for further studies in quantum biological electron or energy transfer, electrodynamics, the electron transport chain of mitochondria, and energy harvesting, sensing, and conversion in both biological and biophysical systems.
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Affiliation(s)
- Egor Kokin
- Institute of Quantum Biophysics, Department of Biophysics, Sungkyunkwan University, Suwon-si 16419, Korea
| | - Hyun Ji An
- Department of Life Science, University of Seoul, Seoul 02504, Korea
- Harvard Institute of Medicine, Harvard Medical School, Harvard University, Brigham and Women's Hospital, Boston, Massachusetts 02115, United States
| | - Donghoon Koo
- Institute of Quantum Biophysics, Department of Biophysics, Sungkyunkwan University, Suwon-si 16419, Korea
| | - Seungyeon Han
- Department of Life Science, University of Seoul, Seoul 02504, Korea
| | - Keumrai Whang
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 04107, Korea
| | - Taewook Kang
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 04107, Korea
| | - Inhee Choi
- Department of Life Science, University of Seoul, Seoul 02504, Korea
- Department of Chemistry, University of Seoul, Seoul 02504, Korea
| | - Luke P Lee
- Institute of Quantum Biophysics, Department of Biophysics, Sungkyunkwan University, Suwon-si 16419, Korea
- Harvard Institute of Medicine, Harvard Medical School, Harvard University, Brigham and Women's Hospital, Boston, Massachusetts 02115, United States
- Department of Bioengineering, University of California at Berkeley, Berkeley, California 94720, United States
- Department of Electrical Engineering and Computer Science, University of California at Berkeley, Berkeley, California 94720, United States
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Nanoengineering of conductively coupled metallic nanoparticles towards selective resonance modes within the near-infrared regime. Sci Rep 2022; 12:7829. [PMID: 35550525 PMCID: PMC9098514 DOI: 10.1038/s41598-022-11539-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Accepted: 04/08/2022] [Indexed: 11/08/2022] Open
Abstract
In this work, the mode transition effect of different plasmonic resonances in linked dimers by a conductive junction is numerically investigated.Without the junction, the dimer supports a single dipolar bonding plasmon mode, while two new resonance modes, a screened bonding dipolar mode and a low energy charge transfer plasmon mode, emerge when two nanoparticles are linked via a bridge. Such effect is proved to be unrelated to the shape of the nanoparticles, whether sphere, core-shell or nanoegg. However, it was found that the status of each specific resonance mode is profoundly influenced by the shape of nanoparticles. Furthermore, a detailed discussion of mechanisms of controlling plasmon modes, specially charge transfer mode, and tuning their corresponding spectra in bridged nanoparticles as functions of nanoparticle parameters and junction conductance is presented. These results show that the optical response of the dimer is highly sensitive to changes in the inter-particle gap. While the capacitive dimer provides a strong hotstop, the conductive dimer leads to highly controllable low energy plasmon mode at the mid-infrared region appropriate for novel applications. These findings may serve as an important guide for optical properties of linked nanoparticles as well as understanding the transition between the capacitive and conductive coupling.
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Bikbaev RG, Maksimov DN, Pankin PS, Chen KP, Timofeev IV. Critical coupling vortex with grating-induced high Q-factor optical Tamm states. OPTICS EXPRESS 2021; 29:4672-4680. [PMID: 33771038 DOI: 10.1364/oe.416132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 01/21/2021] [Indexed: 06/12/2023]
Abstract
We investigate optical Tamm states supported by a dielectric grating placed on top of a distributed Bragg reflector. It is found that under certain conditions the Tamm state may become a bound state in the continuum. The bound state, in its turn, induces the effect of critical coupling with the reflectance amplitude reaching an exact zero. We demonstrate that the critical coupling point is located in the core of a vortex of the reflection amplitude gradient in the space of the wavelength and angle of incidence. The emergence of the vortex is explained by the coupled mode theory.
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