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Fano Resonances in Ultracompact Silicon‐on‐Insulator Compatible Integrated Photonic–Plasmonic Hybrid Circuits
Author(s) -
Qi Zhipeng,
Hu Guohua,
Zheng Pengfei,
Su Ruigong,
Shi Wenhua,
Yun Binfeng,
Zhang Ruohu,
Cui Yiping
Publication year - 2017
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201700304
Subject(s) - fano resonance , laser linewidth , materials science , plasmon , nanorod , optoelectronics , photonics , photonic integrated circuit , wavelength , waveguide , optics , resonance (particle physics) , physics , laser , nanotechnology , particle physics
A novel on‐chip Fano device is experimentally demonstrated operating at telecom wavelengths, which consists of an ultracompact plasmonic nanocavity integrated with two Si waveguides on a silicon‐on‐insulator substrate. It is observed that an Au symmetric split ring with a large linewidth can be coupled to an embedded Au nanorod with a narrow linewidth via excitation of an Si waveguide, contributing to a Fano resonance phenomenon. In addition, the relative precise control of the resonant properties, including the depth, lineshape, and central wavelength, is realized by varying the rotation angle of the Au nanorod. For further investigations, a coupled Lorentz oscillator model is applied to study the transmission peak arising within an absorption region in the nanocavity. Slow‐light effects and sensing characteristics are also verified with finite difference time domain simulations and numerical calculations. This device has achieved Fano resonance in integrated photonic–plasmonic hybrid circuits, which may find utility in optical communications, buffering, and sensing.