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<p>‎This paper reports the optical response of an asymmetric plasmonic nanoshell placed near a fluorescent molecule by considering radiation damping‎, ‎because unlike conventional symmetric nanoshells‎, ‎asymmetric nanoshells have an extra degree of tunability and controllability‎. ‎The optical absorption cross-section of an asymmetric plasmonic metal nanoshell known as a nanoegg‎, ‎in which the core is offset concerning the shell center‎, ‎and a three-layer asymmetric nanoshell with two core and outer shell offsets is investigated and compared‎. ‎We demonstrate how a reduced-symmetry metal nanoshell affects fluorescence quenching of a molecule‎, ‎which refers to a process that decreases the fluorescence intensity of the molecule‎. ‎In addition‎, ‎the asymmetry effect of a plasmonic nanoshell on the fluorescence lifetime is also investigated‎.</p>

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The effects of symmetry breaking in a plasmonic metal nanoshell on the optical absorption cross-section and the fluorescence lifetime of a nearby molecule

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Nader Daneshfar,
  • Darya Moradi,
  • Tawfigh Osati

摘要

‎This paper reports the optical response of an asymmetric plasmonic nanoshell placed near a fluorescent molecule by considering radiation damping‎, ‎because unlike conventional symmetric nanoshells‎, ‎asymmetric nanoshells have an extra degree of tunability and controllability‎. ‎The optical absorption cross-section of an asymmetric plasmonic metal nanoshell known as a nanoegg‎, ‎in which the core is offset concerning the shell center‎, ‎and a three-layer asymmetric nanoshell with two core and outer shell offsets is investigated and compared‎. ‎We demonstrate how a reduced-symmetry metal nanoshell affects fluorescence quenching of a molecule‎, ‎which refers to a process that decreases the fluorescence intensity of the molecule‎. ‎In addition‎, ‎the asymmetry effect of a plasmonic nanoshell on the fluorescence lifetime is also investigated‎.