Antenna-coupled microcavities for terahertz emission

被引：5
|
作者：
Madeo, J. [1 ]
Todorov, Y. [1 ]
Sirtori, C. [1 ]
机构：
[1] Univ Paris Diderot, Sorbonne Paris Cite, Lab Mat & Phenomenes Quant, UMR7162, F-75013 Paris, France
来源：
APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 03期
关键词：
FANO RESONANCE; GENERATION;
D O I：
10.1063/1.4863055
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have investigated the capacitive coupling between dipolar antennas and metal-dielectric-metal wire microcavities with strong sub-wavelength confinement in the terahertz region. The coupling appears in reflectivity measurements performed on arrays of antenna-coupled elements, which display asymmetric Fano lineshapes. The experimental data are compared to a temporal coupled-mode theory and finite elements electromagnetic simulations. We show that the Fano interferences correspond to coupling between a subradiant mode (microcavity) and a superradiant mode (antennas). This phenomenon allows one to enhance and control the radiative coupling of the strongly confined mode with the vacuum. These concepts are very useful for terahertz optoelectronic devices based on deep-sub-wavelength active regions. (C) 2014 AIP Publishing LLC.
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页数：5
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