
1.State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) and Department of Physics, Fudan University, Shanghai 200433, China
2.Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai 200444, China
3.Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
Shiyi Xiao (phxiao@shu.edu.cn)
Qiong He (qionghe@fudan.edu.cn)
Lei Zhou (phzhou@fudan.edu.cn)
Published:2020,
Published Online:08 September 2020,
Received:04 May 2020,
Revised:08 August 2020,
Accepted:11 August 2020
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Lin, J. et al. Tailoring the lineshapes of coupled plasmonic systems based on a theory derived from first principles. Light: Science & Applications, 9, 1507-15017 (2020).
Lin, J. et al. Tailoring the lineshapes of coupled plasmonic systems based on a theory derived from first principles. Light: Science & Applications, 9, 1507-15017 (2020). DOI: 10.1038/s41377-020-00386-5.
Coupled photonic systems exhibit intriguing optical responses attracting intensive attention
but available theoretical tools either cannot reveal the underlying physics or are empirical in nature. Here
we derive a rigorous theoretical framework from first principles (i.e.
Maxwell's equations)
with all parameters directly computable via wave function integrations
to study coupled photonic systems containing multiple resonators. Benchmark calculations against Mie theory reveal the physical meanings of the parameters defined in our theory and their mutual relations. After testing our theory numerically and experimentally on a realistic plasmonic system
we show how to utilize it to freely tailor the lineshape of a coupled system
involving two plasmonic resonators exhibiting arbitrary radiative losses
particularly how to create a completely "dark" mode with vanishing radiative loss (e.g.
a bound state in continuum). All theoretical predictions are quantitatively verified by our experiments at near-infrared frequencies. Our results not only help understand the profound physics in such coupled photonic systems
but also offer a powerful tool for fast designing functional devices to meet diversified application requests.
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