Compact plasmonic dichroic splitting with high splitting ratio based on a cascaded-grating structure

Document Type

Journal Article

Publisher

Optical Society of America

Faculty

Faculty of Health, Engineering and Science

School

Electron Science Research Institute

RAS ID

19288

Comments

Li K., Xiao F., Lu F., Liu D., Alameh K., Xu A. (2014). Compact plasmonic dichroic splitting with high splitting ratio based on a cascaded-grating structure. Journal of the Optical Society of America B: Optical Physics, 31(2), 387-392. Available here

Abstract

A compact dichroic surface plasmon polariton (SPP) splitting scheme composed of two cascaded subgratings of different dimensions is proposed and investigated. The normal incident photons illuminated on the dichroic splitting structure are converted to surface plasmons traveling to the left or right depending on the wavelength. The operation principle is clarified and a coupled-mode model is developed to facilitate structure design. The generated SPPs propagating to the left and right directions on the metal surface can be manipulated nearly independently by altering the left and right subgrating, respectively. Proof-of-principle demonstrations show that a remarkable property of high splitting ratios is achieved with 43.0 dB at wavelength 1310 nm (left:right power contrast) and 35.7 dB at wavelength 1550 nm (right:left power contrast). The proposed splitting concept has general applicability across other operating wavelengths, such as the visible and near-infrared range.

DOI

10.1364/JOSAB.31.000387

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