Fano Resonances in Ultracompact Silicon‐on‐Insulator Compatible Integrated Photonic–Plasmonic Hybrid Circuits. Issue 24 (20th November 2017)

• Record Type: Journal Article
• Authors: Qi, Zhipeng; Hu, Guohua; Zheng, Pengfei; Su, Ruigong; Shi, Wenhua; Yun, Binfeng; Zhang, Ruohu; Cui, Yiping
• Is Part Of: Advanced optical materials. Volume 5:Issue 24(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-11-20
• Subjects: coupled Lorentz oscillators -- Fano devices -- plasmonic nanocavities -- resonant properties; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.201700304
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: 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. Abstract : An integrated Fano device based on an silicon‐on‐insulator compatible photonic–plasmonic hybrid circuit is presented, which mainly consists of an ultracompact plasmonic nanocavity and two Si nanowire waveguides. A controllable Fano resonance is realized in this circuit, which can be explained by three coupled oscillators model. This device may find utility in optical communications, buffering, and sensing.