Tunable coherent perfect absorption in three-dimensional Dirac semimetal films

Jipeng Wu; Jie Tang; Rongzhou Zeng; Xiaoyu Dai; Yuanjiang Xiang

doi:10.3788/COL202119.081601

Journals >Chinese Optics Letters >Volume 19 >Issue 8 >Page 081601 > Article

Chinese Optics Letters
Vol. 19, Issue 8, 081601 (2021)

Tunable coherent perfect absorption in three-dimensional Dirac semimetal films

Jipeng Wu^1、2, Jie Tang¹, Rongzhou Zeng², Xiaoyu Dai³, and Yuanjiang Xiang^1、*

Author Affiliations

¹School of Physics and Electronics, Hunan University, Changsha 410082, China

²College of Traffic Engineering, Hunan University of Technology, Zhuzhou 412007, China

³College of Electrical and Information Engineering, Hunan University, Changsha 410082, China

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DOI: 10.3788/COL202119.081601 Cite this Article Set citation alerts

Jipeng Wu, Jie Tang, Rongzhou Zeng, Xiaoyu Dai, Yuanjiang Xiang. Tunable coherent perfect absorption in three-dimensional Dirac semimetal films[J]. Chinese Optics Letters, 2021, 19(8): 081601 Copy Citation Text

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Abstract

In this article, we investigate the phenomenon of coherent perfect absorption (CPA) with bulk Dirac semimetal (BDS) thin film. CPA of BDS appears at the frequency of 43.89 THz with 0° phase modulation of two coherent input lights. Meanwhile, it shows that CPA can be realized under oblique incidence circumstances for both TM and TE polarizations. Moreover, the frequency of CPA can be adjusted by altering the thickness of BDS thin film, and the dynamic regulation of CPA can be realized by changing the Fermi energy. Finally, the peak coherent absorption frequency can be controlled by changing the degeneracy factor.

Keywords

bulk Dirac semimetal coherent perfect absorption phase modulation thin film

Re σ (Ω) = \frac{e^{2}}{ℏ} \frac{g k_{F}}{24 π} Ω θ (Ω - 2),

(1)

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Im σ (Ω) = \frac{e^{2}}{ℏ} \frac{g k_{F}}{24 π^{2}} [\frac{4}{Ω} - Ω \ln (\frac{4 ε_{c}^{2}}{| Ω^{2} - 4 |})],

(2)

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ε = ε_{b} + \frac{i σ}{ε_{0} ω},

(3)

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(\begin{matrix} O_{+} \\ O_{-} \end{matrix}) = S (\begin{matrix} I_{+} \\ I_{-} \end{matrix}) = (\begin{matrix} t_{+} & r_{-} \\ r_{+} & t_{-} \end{matrix}) (\begin{matrix} A e^{i φ_{+}} \\ B e^{i φ_{-}} \end{matrix}),

(4)

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A_{C} = 1 - {(| t | - | r |)}^{2} - 2 | t r | (1 + \cos Δ ϕ_{1} \cos Δ ϕ_{2} \frac{2 A B}{A^{2} + B^{2}}),

(5)

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Jipeng Wu, Jie Tang, Rongzhou Zeng, Xiaoyu Dai, Yuanjiang Xiang. Tunable coherent perfect absorption in three-dimensional Dirac semimetal films[J]. Chinese Optics Letters, 2021, 19(8): 081601

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