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タイトル: Interpreting Purcell enhancement of non-Hermitian metasurfaces with spectral parameters
著者: Tse, Joshua T. Y.
Murai, Shunsuke
Tanaka, Katsuhisa
著者名の別形: 村井, 俊介
田中, 勝久
キーワード: Light-matter interaction
Metasurfaces
Nanostructures
Non-Hermitian systems
Coupled mode theory
Finite-difference time-domain method
Optical spectroscopy
発行日: Jan-2025
出版者: American Physical Society (APS)
誌名: Physical Review A
巻: 111
号: 1
論文番号: 013511
抄録: The Purcell effect describes the enhancement of the spontaneous emission rate of an emitter near a resonant structure. However, evaluating the Purcell factor quantitatively and empirically is difficult due to the difficulties in measuring the electromagnetic near field of an optical resonance for calculation of the exact effective modal volume, especially with non-Hermitian resonators. Therefore, we propose an analytical approach to circumvent the need to measure the near field and predict the Purcell enhancement with spectral parameters, which can be directly measured in the far field or fitted from such spectral measurements. Our proposed model predicts the averaged Purcell enhancement by metasurfaces on a photoluminescent medium, and is verified with experimental measurements and numerical simulations of nanoparticle arrays coupled to a fluorescent thin film. The model directly analyzes the photoluminescence enhancement and extraction efficiency of the metasurface, and can be generalized to work with an arbitrarily shaped photoluminescent medium that is coupled to a resonator. This discovery provides a practical and accessible way to understand the underlying mechanisms of photoluminescence enhancement and will facilitate optimization of metasurfaces for efficient extraction of the enhanced luminescence.
著作権等: ©2025 American Physical Society
URI: http://hdl.handle.net/2433/294644
DOI(出版社版): 10.1103/PhysRevA.111.013511
出現コレクション:学術雑誌掲載論文等

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