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Perfect absorber supported by optical Tamm states in plasmonic waveguide

Yongkang Gong, Xueming Liu, Hua Lu, Leiran Wang, and Guoxi Wang

Open Access Open Access

Abstract

Based on a two-dimensional plasmonic metal-dielectric-metal (MDM) waveguide with a thin metallic layer and a dielectric photonic crystal in the core, a novel absorber at visual and near-infrared frequencies is presented. The absorber spectra and filed distributions are investigated by the transfer-matrix-method and the finite-difference time-domain method. Numerical results show that attributing to excitation of the optical Tamm states in the MDM waveguide core, the optical wave is trapped in the proposed structure without reflection and transmission, leading to perfect absorption as high as 0.991. The proposed absorber can find useful application in all-optical integrated photonic circuits.

©2011 Optical Society of America

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Supplementary Material (2)

Media 1: MOV (178 KB)     
Media 2: MOV (197 KB)     

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Figures (7)
Fig. 1
Fig. 1 (a) Schematic diagram of the proposed perfect absorber. A TML is arranged in the air core of the two-dimensional MDM waveguide, and a PhC with N periodical dielectric layers of A (TiO 2) and B (PSiO 2) is adjacent to it. (b) The real and (c) imaginary parts of the effective refractive indexes for SPPs propagating in the dielectrics A (red solid line) and B (blue dotted line), respectively.

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Fig. 2
Fig. 2 (a) Reflection (R) and transmission (T) spectra for the plasmonic MDM waveguide with single TML or (AB)10 in the core, respectively. (b) Transmission, reflection, and absorption spectra calculated by the TMM and FDTD method for the MDM waveguide with the TML followed by the (AB)10 in the core, respectively. The structure geometric parameters are: w = 80 nm, L m = 22 nm, L a = 140 nm, Lb = 220 nm, na = 2.13, and nb = 1.23.

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Fig. 3
Fig. 3 (a) Reflection, transmission and (b) absorption spectra for the proposed plasmonic absorber under different value of electron collision frequency γ. The other geometric parameters are: w = 80 nm, L m = 22 nm, L a = 140 nm, Lb = 220 nm, na = 2.13, and nb = 1.23.

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Fig. 4
Fig. 4 Field distributions of Hz for the proposed structure at the wavelengths of (a) 1300 nm (Media 1) and (b) 1550 nm (Media 2), respectively. (c) Field amplitudes of |Hz | along y = 0 at wavelength of 1550 nm. The TML/(AB)10 boundary is at x = 0 μm.

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Fig. 5
Fig. 5 Absorption spectra versus the L a and L b when w = 80 nm and L m = 22 nm.

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Fig. 6
Fig. 6 (a) Absorption spectra versus the w. (b) The neff for SPPs propagating in the dielectrics A and B for different w. The other structure parameters are: L m = 22 nm, L a = 140 nm, and L b = 220 nm.

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Fig. 7
Fig. 7 Absorption evolution with the L m and wavelength when w = 80 nm, L a = 140 nm, and L b = 220 nm.

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Equations (2)

Equations on this page are rendered with MathJax. Learn more.

k d ε m tanh ( k d w 2 ) + ε d k m = 0.
ε m = ε 0 − ω p 2 ω 2 + i ω γ ,
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