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SCIENCE CHINA Information Sciences, Volume 64 , Issue 4 : 140405(2021) https://doi.org/10.1007/s11432-020-3149-2

Optical emission enhancement of bent InSe thin films

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  • ReceivedNov 13, 2020
  • AcceptedDec 25, 2020
  • PublishedMar 8, 2021

Abstract


Acknowledgment

This work was supported by National Natural Science Foundation of China (Grants Nos. 61722403, 11674121) and Jilin Province Science and Technology Development Program (Grants No. 20190201016JC). Calculations were performed in part at the High-performance Computing Center of Jilin University.


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  • Figure 1

    (Color online) Electronic structures and optical transitions of few-layers InSe. Projected band structure of (a) ML and (b) 3-layer InSe, with In-s orbital, Se-$\rm~p_z$ orbital and Se-$\rm~p_{xy}$ orbital indicated by green blue and red circles, respectively. (c) The ratio between the Se-$\rm~p_z$ orbitals components and Se-$\rm~p_{xy}$ orbitals components of VB edge and second-highest VB of 1–9 layers InSe. (d) The scissor corrected energies of transitions A, $B'$, and Bof 1–9 layers InSe.

  • Figure 2

    (Color online) (a) Scheme of the geometrical modified InSe sheet with bent and flat regions. Scheme of effective absorption coefficient in (b) bent region and (c) flat region.

  • Figure 3

    (Color online) Absorption coefficients for electric field dipole E (a) perpendicular and (b) parallel to the c-axis. Results of 1–9 layers InSe are represented by curves with different colors, respectively. The energies of transitions $A$, $B'$, and $B$ of different layers are indicated by short dash lines on each curve.

  • Figure 4

    (Color online) (a) The ratio of $\rm~\alpha_{||}/\alpha_\perp$ of 1–3 and 9 layers InSe with respect to energy. (b) The absorption coefficient $\rm~\alpha_{||}$ and $\alpha_\perp$ of 1–3 and 9 layers InSe. The energies of optical transitions A, $B'$ and Bare indicated by dash lines in each graph.

  • Figure 5

    (Color online) The optical emission enhancement model results. (a)–(l) The colored contour maps of the optical emission enhancement of 1–9 layers InSe, respectively, as a function of the photon energy of the incident light and its angle with the InSe plane. The color represents the value of the enhancement. The maximum enhancement with its corresponding $E_{\rm~exc}$ and $\theta$ is marked out with a star in each graph. The energies of transitions Aand $B'$ are indicated by white lines in each graph.

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