太赫兹非对称宽边耦合裂环谐振器的去耦交越
Decoupling Crossover in Asymmetric Broadside Coupled Split Ring Resonators at Terahertz Frequencies
摘要：
研究了非对称宽边耦合开口环谐振器（ABC-SRR）的电磁响应随两个元件面内相对位移的变化关系。不对称性被定义为构成耦合单元的两个谐振器之间的电容间隙宽度（Δg）的差。我们通过太赫兹时域光谱的ABC-SRRs的响应特性的数值和实验。与对称BC-SRRs（Δg=0 μm）一样，随着位移的增加，观察到LC谐振中的大红移，这是由电容和电感耦合的变化引起的。然而，对于ABC-SRR，两个谐振器之间的面内移位超过0.375Lo（Lo=SRR侧长）导致向具有两个谐振模式的响应的转变，这与ABC-SRR中的去耦相关联。随着Δg的增加，退耦转变开始于相同的相对位移（0.375Lo），尽管新模式的振子强度增加。这与对称BC-SRRs形成强烈对比，对称BC-SRRs对于高达0.75Lo的位移仅呈现一个共振。由于所有的BC-SRR在放置在衬底上时都是有效不对称的，因此对ABC-SRR行为的理解对于完全理解基于BC-SRR的超材料至关重要。
英文摘要：
We investigate the electromagnetic response of asymmetric broadside coupled split ring resonators (ABC-SRRs) as a function of the relative in-plane displacement between the two component SRRs. The asymmetry is defined as the difference in the capacitive gap widths (Δg) between the two resonators comprising a coupled unit. We characterize the response of ABC-SRRs both numerically and experimentally via terahertz time-domain spectroscopy. As with symmetric BC-SRRs (Δg=0 μm), a large redshift in the LC resonance is observed with increasing displacement, resulting from changes in the capacitive and inductive coupling. However, for ABC-SRRs, in-plane shifting between the two resonators by more than 0.375Lo (Lo=SRR sidelength) results in a transition to a response with two resonant modes, associated with decoupling in the ABC-SRRs. For increasing Δg, the decoupling transition begins at the same relative shift (0.375Lo), though with an increase in the oscillator strength of the new mode. This strongly contrasts with symmetric BC-SRRs which present only one resonance for shifts up to 0.75Lo. Since all BC-SRRs are effectively asymmetric when placed on a substrate, an understanding of ABC-SRR behavior is essential for a complete understanding of BC-SRR based metamaterials.
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