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J. Am. Chem. Soc., Oct 30 2024, | https://doi.org/10.1021/jacs.4c11083 Biological Cavity Quantum Electrodynamics via Self-Aligned Nanoring Doublets: QED-SANDs

Kyungwha Chung^1,2, Soohyun Lee³, Nathan Grain ⁴, Kyeongdeuk Moon ⁴, Seungyeon Han⁵, Subin Yu ^2,6, Haeun Kang ⁶, Dong Ha Kim ⁶, Inhee Choi⁵, Sungho Park⁷, Seokhyoung Kim ⁴, Luke P Lee ^1,2,6

¹Institute of Quantum Biophysics, Sungkyunkwan University, Suwon 16419, Republic of Korea.

²Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Harvard University, Boston, Massachusetts 02115, United States.

³Department of Chemistry, Sungkyunkwan University, Suwon 16419, Republic of Korea.

⁴Department of Chemistry, Michigan State University, East Lansing, Michigan 48823, United States.

⁵Department of Life Science, University of Seoul, Seoul 02504, Republic of Korea.

⁶Department of Chemistry & Nanoscience, Ewha Womans University, Seoul 03760, Republic of Korea.

⁷Department of Chemistry, Yonsei University, Seoul 03722, Republic of Korea.

Corresponding Authors: Sungho Park, Seokhyoung Kim, Luke P. Lee

Abstract

Quantum mechanics is applied to create numerous electronic devices, including lasers, electron microscopes, magnetic resonance imaging, and quantum information technology. However, the practical realization of cavity quantum electrodynamics (QED) in various applications is limited due to the demanding conditions required for achieving strong coupling between an optical cavity and excitonic matter. Here, we present biological cavity QED with self-aligned nanoring doublets: QED-SANDs, which exhibit robust room-temperature strong coupling with a biomolecular emitter, chlorophyll-a. We observe the emergence of plasmon-exciton polaritons, which manifest as a bifurcation of the plasmonic scattering peak of biological QED-SANDs into two distinct polariton states with Rabi splitting up to ∼200 meV. We elucidate the mechanistic origin of strong coupling using finite-element modeling and quantify the coupling strength by employing temporal coupled-mode theory to obtain the coupling strength up to approximately 3.6 times the magnitude of the intrinsic decay rate of QED-SANDs. Furthermore, the robust presence of the polaritons is verified through photoluminescence measurements at room temperature, from which strong light emission from the lower polariton state is observed, while emission from the upper polariton state is quenched. QED-SANDs present significant potential for groundbreaking insights into biomolecular behavior in nanocavities, especially in the context of quantum biology.

논문정보

형식Research article
게재일2024년 10월 (BRIC 등록일 2024-11-04)
연구진국내(교신)+국외 연구진
분야 바이오·의료융합 > 바이오센싱 및 나노바이오물질

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