Perfect light absorption in monolayer MoS2 empowered by optical Tamm states

Yangwu Li; Hua Lu; Jiadeng Zheng; Shichang Li; Xiao Xuan; Jianlin Zhao

doi:10.3788/COL202119.103801

Journals >Chinese Optics Letters >Volume 19 >Issue 10 >Page 103801 > Article

Chinese Optics Letters
Vol. 19, Issue 10, 103801 (2021)

Perfect light absorption in monolayer MoS₂ empowered by optical Tamm states

Yangwu Li, Hua Lu^*, Jiadeng Zheng, Shichang Li, Xiao Xuan, and Jianlin Zhao^**

Author Affiliations

MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Key Laboratory of Light-Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China

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DOI: 10.3788/COL202119.103801 Cite this Article Set citation alerts

Yangwu Li, Hua Lu, Jiadeng Zheng, Shichang Li, Xiao Xuan, Jianlin Zhao. Perfect light absorption in monolayer MoS₂ empowered by optical Tamm states[J]. Chinese Optics Letters, 2021, 19(10): 103801 Copy Citation Text

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Abstract

We present the perfect light absorption of monolayer molybdenum disulfide (

{MoS}_{2}

) in a dielectric multilayer system with two different Bragg mirrors. The results show that the strong absorption of visible light in monolayer

{MoS}_{2}

is attributed to the formation of optical Tamm states (OTSs) between two Bragg mirrors. The

{MoS}_{2}

absorption spectrum is dependent on the layer thickness of Bragg mirrors, incident angle of light, and the period numbers of Bragg mirrors. Especially, the nearly perfect light absorption (99.4%) of monolayer

{MoS}_{2}

can be achieved by choosing proper period numbers, which is well analyzed by the temporal coupled-mode theory.

Keywords

light absorption molybdenum disulfide optical Tamm states

ε_{r} = ε_{\infty} + \sum_{k = 1}^{K} \frac{a_{k}}{ω_{k}^{2} - ω^{2} - j ω b_{k}},

(1)

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[\begin{matrix} E_{i - 1}^{+} \\ E_{i - 1}^{-} \end{matrix}] = [\begin{matrix} 1 / t_{i} & r_{i} / t_{i} \\ r_{i} / t_{i} & 1 / t_{i} \end{matrix}] [\begin{matrix} e^{- j ϕ_{i}} & 0 \\ 0 & e^{j ϕ_{i}} \end{matrix}] [\begin{matrix} E_{i}^{+} \\ E_{i}^{-} \end{matrix}] = M_{i} P_{i} [\begin{matrix} E_{i}^{+} \\ E_{i}^{-} \end{matrix}],

(2)

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Q = [\prod_{i = 1}^{2 (P_{r} + P_{l}) + 1} M_{i} P_{i}] M_{2 (P_{r} + P_{l}) + 2} = [\begin{matrix} Q_{11} Q_{12} \\ Q_{21} Q_{22} \end{matrix}] .

(3)

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\frac{d a}{d t} = (- j ω_{0} - γ_{1} - γ_{2} - γ_{3}) a + \sqrt{2 γ_{1}} S_{1 +},

(4)

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S_{1 -} = - S_{1 +} + \sqrt{2 γ_{1}} a,

(5)

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S_{2 -} = \sqrt{2 γ_{2}} a .

(6)

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A (ω) = \frac{4 γ_{1} γ_{3}}{{(ω - ω_{0})}^{2} + {(γ_{1} + γ_{2} + γ_{3})}^{2}} .

(7)

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Yangwu Li, Hua Lu, Jiadeng Zheng, Shichang Li, Xiao Xuan, Jianlin Zhao. Perfect light absorption in monolayer MoS₂ empowered by optical Tamm states[J]. Chinese Optics Letters, 2021, 19(10): 103801

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