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Sharp and Tunable Crystal/Fano‐Type Resonances Enabled by Out‐of‐Plane Dipolar Coupling in Plasmonic Nanopatch Arrays
Author(s) -
Taghinejad Mohammad,
Taghinejad Hossein,
Malak Sidney T.,
Moradinejad Hesam,
Woods Eric V.,
Xu Zihao,
Liu Yawei,
Eftekhar Ali A.,
Lian Tianquan,
Tsukruk Vladimir V.,
Adibi Ali
Publication year - 2018
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.201700395
Subject(s) - resonance (particle physics) , laser linewidth , plasmon , fano resonance , dipole , materials science , optoelectronics , optics , coupling (piping) , molecular physics , physics , atomic physics , laser , quantum mechanics , metallurgy
Tuning resonance lineshapes of plasmonic structures is essential to create customized media with compelling optical properties for optimized light–matter interactions. The diversity of available metals and the variety of design architectures provide a rich portfolio for statically controlling the resonance lineshape. However, dynamic tuning of resonance attributes (e.g., the resonance wavelength and linewidth) are yet to be more expanded, especially when a narrow resonance linewidth is on demand. Here, using a plasmonic nanopatch array, sharp plasmonic crystal (PC) resonances are demonstrated across a wide spectral range of 230 nm, with full‐width at half‐maximum of only ≈6 nm. The combination of angle‐resolved ellipsometry and full‐wave simulations shows that diffractive coupling of out‐of‐plane electric dipoles is the principal contributor in the formation of such sharp PC resonances. In addition, the designed nanopatch PC supports a plasmonic Fabry–Pérot‐like resonance that can be interfered with the PC resonance to generate complex Fano‐type lineshapes. The coexistence of tunable resonance features renders the designed structures as a rich platform for applications seeking enhanced light–matter interactions and optical signal processing.