Mid-Infrared Circularly Polarized Beam Splitter Based on Metasurfaces

Yu Han; Ying Su; Xinwei Zhou; Chenyang Song; Jingyuan Jia; Tun Cao

doi:10.3788/AOS240864

Acta Optica Sinica, Volume. 44, Issue 19, 1924001(2024)

Mid-Infrared Circularly Polarized Beam Splitter Based on Metasurfaces

Yu Han, Ying Su, Xinwei Zhou, Chenyang Song, Jingyuan Jia, and Tun Cao^*

School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, Liaoning , China

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Figures & Tables(7)

Fig. 1. Unit structure and scanning data. (a) Schematic diagram of metasurface unit structure; (b) change in transmittance of unit structure with structural size; (c) change in phase of unit structure with structural size

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Fig. 2. Electric field diagrams of different cross-sections. (a) Electric field distribution in x-z plane; (b) electric field distribution in y-z plane; (c) electric field distribution in bottom plane; (d) electric field distribution in top plane

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Fig. 3. Phase value of each position on optimized metasurface. (a) Phase value under x-polarization; (b) phase value under y-polarization; (c) rotation angle of unit structure

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$Energy distributions, polarization state distribution, and actual size of metasurface. (a)‒(d) Energy distributions under q(0,1), q(1,0), q(-1,0), and q(0,-1) polarization states; (e) distributions of four polarization states at four diffraction orders; (f) top view of metasurface structure$

Fig. 4. Energy distributions, polarization state distribution, and actual size of metasurface. (a)‒(d) Energy distributions under $q_{(0,1)}$ , $q_{(1,0)}$ , $q_{(- 1,0)}$ , and $q_{(0, - 1)}$ polarization states; (e) distributions of four polarization states at four diffraction orders; (f) top view of metasurface structure

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Fig. 5. Simulation results and comparison graphs. (a)‒(d) Electric field distributions of polarization states $q_{(0,1)}$ , $q_{(1,0)}$ , $q_{(- 1,0)}$ , and $q_{(0, - 1)}$ when incident separately; (e)‒(h) energy ratio of each polarization state ( $q_{(0,1)}$ , $q_{(1,0)}$ , $q_{(- 1,0)}$ , and $q_{(0, - 1)}$ ) when incident separately; (i)‒(l) Jones vector comparison graphs of $q_{(0,1)}$ , $q_{(1,0)}$ , $q_{(- 1,0)}$ , and $q_{(0, - 1)}$ in elliptical form and simulated metasurface at s-polarization (s-pol) and p-polarization (p-pol) states

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Table 1. Comparison of characteristics of different materials
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Table 1. Comparison of characteristics of different materials
Material Transmittance /% Refractive index Melting point /℃
BaF₂ 95 1.46 1354
CaF₂ 95 1.41 1423
Si 55 3.43 1410
Ge 47 3.98 937
ZnSe 71 2.42 1100
ZnS 62 2.26 1700
LiF 97 1.35 845
MgF₂ 96 1.35 1261

Table 2. Numerical description of polarization states
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Table 2. Numerical description of polarization states
Polarization state Normalized Jones vector Azimuth /(°) Ellipticity
$q_{(0,1)}$ ${[0.514, 0.79 - 0.32 i]}^{Τ}$ 60 5.83
$q_{(0, - 1)}$ ${[0.514, - 0.79 - 0.32 i]}^{Τ}$ 120 5.83
$q_{(1,0)}$ ${[0.707, 0.707 i]}^{Τ}$ 0 1.00
$q_{(- 1,0)}$ ${[0.986, - 0.169 i]}^{Τ}$ 0 5.83

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Yu Han, Ying Su, Xinwei Zhou, Chenyang Song, Jingyuan Jia, Tun Cao. Mid-Infrared Circularly Polarized Beam Splitter Based on Metasurfaces[J]. Acta Optica Sinica, 2024, 44(19): 1924001

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