Resonance properties of THz plasmonic dipole-bowtie antenna array: The critical role of the substrate

doi:10.1088/1674-1056/23/12/128702

Abstract Subwavelength arrays of dipole-bowtie antennas are designed and characterized using terahertz time-domain spectroscopy (THz-TDS) and finite element method (FEM) simulations. Two different substrates, silicon and mylar with an order of magnitude difference between their thickness values are used to study the resonance properties of the antennas. The 640-μm thick silicon substrate supports a sharper fundamental mode resonance. We discover that higher-order Fabry–Perot resonances can be excited only in 24-μm thin mylar substrates and show much higher sensitivity to dielectric changes in the environment and the geometrical parameters of the antennas than the fundamental dipole resonance.

Keywords: THz-TDS dipole-bowtie antennas plasmonic resonator

Received: 17 June 2014
Revised: 18 August 2014
Accepted manuscript online:

PACS:	87.50.U-
	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
	52.40.Fd	(Plasma interactions with antennas; plasma-filled waveguides)

Fund: Project partly supported by the National Natural Science Foundation of China (Grant Nos. 11104360, 11204191, and 11374378), the National Special Fund for the Development of Major Research Equipment and Instruments, China (Grant No. 2012YQ14000508), and the Technology Foundation for Selected Overseas Chinese Scholar.

Corresponding Authors: Yang Yu-Ping
E-mail: ypyang_cun@126.com

Cite this article:

Yang Yu-Ping (杨玉平), Ranjan Singh, Zhang Wei-Li (张伟力) Resonance properties of THz plasmonic dipole-bowtie antenna array: The critical role of the substrate 2014 Chin. Phys. B 23 128702


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Resonance properties of THz plasmonic dipole-bowtie antenna array: The critical role of the substrate

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