Mid-infrared superabsorbers based on quasi-periodic moir&#233; metasurfaces

Yaoran Liu; Zilong Wu; Eric H. Hill; Yuebing Zheng

doi:10.3788/COL201816.050004

Journals >Chinese Optics Letters >Volume 16 >Issue 5 >Page 050004 > Article

Chinese Optics Letters
Vol. 16, Issue 5, 050004 (2018)

Mid-infrared superabsorbers based on quasi-periodic moiré metasurfaces

Yaoran Liu, Zilong Wu, Eric H. Hill, and Yuebing Zheng^*

Author Affiliations

Department of Mechanical Engineering and Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, USA

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DOI: 10.3788/COL201816.050004 Cite this Article Set citation alerts

Yaoran Liu, Zilong Wu, Eric H. Hill, Yuebing Zheng. Mid-infrared superabsorbers based on quasi-periodic moiré metasurfaces[J]. Chinese Optics Letters, 2018, 16(5): 050004 Copy Citation Text

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Abstract

We report on mid-infrared superabsorbers based on quasi-periodic moiré metasurfaces in metal-insulator-metal form. By varying the spacer thickness, moiré rotation angle, and filling factor of the superabsorbers, we can tune narrowband or broadband absorption in a systematic way. With their high tunability of near-unity absorption and simple fabrication, in combination with decoupled mode theory for an efficient design, moiré superabsorbers are well-suited for a wide range of applications in sensing, imaging, and communication.

\cos θ = \frac{n^{2} + 4 m n + m^{2}}{2 (n^{2} + m n + m^{2})},

(1)

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\cos (60 ° - θ) = \frac{n^{' 2} + 4 m^{'} n^{'} + m^{' 2}}{2 (n^{' 2} + m^{'} n^{'} + m^{' 2})} .

(2)

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\cos θ + \frac{δ}{2} \geq \frac{n^{2} + 4 m n + m^{2}}{2 (n^{2} + m n + m^{2})} \geq \cos θ - \frac{δ}{2},

(3)

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\cos (60 ° - θ) + \frac{δ}{2} \geq \frac{n^{' 2} + 4 m^{'} n^{'} + m^{' 2}}{2 (n^{' 2} + m^{'} n^{'} + m^{' 2})} \geq \cos (60 ° - θ) - \frac{δ}{2} .

(4)

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r = r_{o}^{'} + r_{1}^{'} + r_{2}^{'} + r_{3}^{'} + \dots = r_{12} - \frac{t_{12} t_{21} e^{i 2 β}}{1 + r_{21} e^{i 2 β}} .

(5)

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A = 1 - {| r |}^{2} .

(6)

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Yaoran Liu, Zilong Wu, Eric H. Hill, Yuebing Zheng. Mid-infrared superabsorbers based on quasi-periodic moiré metasurfaces[J]. Chinese Optics Letters, 2018, 16(5): 050004

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