Abstract
AbstractA 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.
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