title: Experimental verification and investigation of disks scattering slab modes in metal-dielectric heterostructures.
abstract: A thin dielectric plate can support conventional slab modes such as leaky Fabry-Perot, guided waves and radiation modes. When the plate is coated on a metallic subwavelength disk array, it can result in new confined modes, hereby named 'disks scattering slab modes' (DSSMs). By use of a terahertz time-domain spectroscopy system, we experimentally verify the existence of two types of DSSMs in terahertz range: one we refer to as highly confined disks scattering Fabry-Perot-like modes (DSFPMs) and the other as, weakly confined disks scattering radiation-like modes (DSRMs). Spectral characteristics of these confined modes are measured and numerically simulated. Particularly, based on the experimental results and a dipole-scattering model developed here, we show that the features of the DSFPMs can be tuned by changing the filling fraction of the disk array. We believe these results can make important contributions to the designs of new terahertz devices, including tunable absorbers and filters.
authors: 1] Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China [2] School of Physical Science and Technology, Yunnan University, Kunming 650091, China.
authors: Lan
authors: L
authors: Ding
authors: Ke Jia
authors: KJ
authors: Wang
authors: Wei
authors: W
authors: Wang
authors: De Feng
authors: DF
authors: Zhu
authors: Chao Yun
authors: CY
authors: Yin
authors: Jin Song
authors: JS
authors: Liu
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