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Appl. Sci. 2017, 7(1), 86; doi:10.3390/app7010086

A Metal-Insulator-Metal Deep Subwavelength Cavity Based on Cutoff Frequency Modulation

Department of Physics, Chung-Ang University, Seoul 06974, Korea
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Academic Editor: Boris Malomed
Received: 16 November 2016 / Revised: 23 December 2016 / Accepted: 10 January 2017 / Published: 17 January 2017
(This article belongs to the Special Issue Guided-Wave Optics)
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Abstract

We propose a plasmonic cavity using the cutoff frequency of a metal-insulator-metal (MIM) first-order waveguide mode, which has a deep subwavelength physical size of 240 × 210 × 10 (nm3) = 0.00013 λ03. The cutoff frequency is a unique property of the first-order waveguide mode and provides an effective mode gap mirror. The cutoff frequency has strong dependence on a variety of parameters including the waveguide width, insulator thickness, and insulator index. We suggest new plasmon cavities using three types of cutoff frequency modulations. The light can be confined in the cavity photonically, which is based on the spatial change of the cutoff frequency. Furthermore, we analyze cavity loss by investigating the metallic absorption, radiation, and waveguide coupling loss; the radiation loss of the higher-order cavity mode can be suppressed by multipole cancellation. View Full-Text
Keywords: MIM; deep subwavelength; cutoff; first order waveguide mode MIM; deep subwavelength; cutoff; first order waveguide mode
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Moon, K.; Lee, T.-W.; Lee, Y.J.; Kwon, S.-H. A Metal-Insulator-Metal Deep Subwavelength Cavity Based on Cutoff Frequency Modulation. Appl. Sci. 2017, 7, 86.

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