Ultra-deep stopband induced by spontaneous-emission-cancellation–like interference between two side-coupled zero-index-metamaterial–based resonators
Key Laboratory of Advanced Micro-structure Materials, MOE, Department of Physics, Tongji University Shanghai 200092, China
Received: 28 August 2012
Accepted: 16 October 2012
In this paper, two side-coupled zero-index-metamaterial–based resonators that mimic the spontaneous-emission cancellation (SEC) effect are investigated numerically and experimentally. It is found that an interference-induced stopband as deep as −70 dB can be observed in a microstrip SEC structure whose size is even less than 0.5 cm2. More simulations about the electrical-field distributions demonstrate intuitively the underlying physics, i.e., the destructive interference between two side-coupled zero-index-metamaterial–based resonators. Our method of realizing ultra-deep stopband properties in a miniaturized filter may find potential applications in both microwave and optical-communication systems.
PACS: 41.20.Jb – Electromagnetic wave propagation; radiowave propagation / 42.60.Da – Resonators, cavities, amplifiers, arrays, and rings
© EPLA, 2012