Electric field tunable strong transverse light current from nanoparticles embedded in liquid crystal

Jinhua Li; Xiangdong Zhang

doi:doi:10.1364/PRJ.6.000630

Photonics Research, 2018, 6 (6): 06000630, Published Online: Jul. 2, 2018

Electric field tunable strong transverse light current from nanoparticles embedded in liquid crystal

Jinhua Li Xiangdong Zhang ^*

Author Affiliations

Beijing Key Laboratory of Nanophotonics & Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China

Figures & Tables

Fig. 1. Geometry of the scattering problem for an ensemble of N spheres embedded in an LC cell. Here, θ and φ denote the polar and azimuthal angles of the wave vector k→, respectively. The α represents tilt angle between the principal axis of the nematic LC molecule and the x axis.

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Fig. 2. (a) Transverse asymmetry parameter gy and (b) scattering efficiency Qs as a function of incident frequency at external voltage V/Vc=1.0239 in the non-centrosymmetric case. (c) and (d) show the results in the centrosymmetric case. The geometrical parameters of two structures as shown in the inset of (b) and (d) are taken as R=50 nm, r=13 nm, and dy=20 nm. Red, blue, and green lines represent left circularly polarized, right circularly polarized, and linearly polarized incident waves, denoted by LCP, RCP, and LP10 with (pθ,pφ)=1/2(1,i), (pθ,pφ)=1/2(1,−i), and (pθ,pφ)=(1,0), respectively. The black lines denote the results for the pure LC cell, with r=0 nm illuminated by the left circularly polarized wave. The A, B, and C points in (b) indicate the values of gy and Qs in Figs. 3(a)–3(c), respectively.

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Fig. 3. In the x–y plane, the distributions of the electric field intensity (a), (b), and (c) correspond to the points A, B, and C in Fig. 2(b), respectively. (d), (e), and (f) show the time-average scattering Poynting vector distributions of points A, B, and C separately.

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Fig. 4. (a) Transverse asymmetry parameter gy as a function of incident frequency. Black solid and red dashed lines represent two linearly polarized incident waves, denoted by LP10 and LP01 with (pθ,pφ)=(1,0) and (pθ,pφ)=(0,1), respectively. The blue square line represents the LP10 result calculated using COMSOL Multiphysics. (b), (c) Electric field intensity for the points A and B, respectively, in (a). (d), (e) The corresponding time-average scattering Poynting vector. The asymmetric chain structure is shown in the inset of (a). The value of external voltage is V/Vc=1.0239. The geometrical parameters are described in the text.

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Fig. 5. Asymmetric chain structure with R=50 nm is illuminated by the linearly polarized wave LP10. (a) Transverse asymmetry parameter gy as a function of the ratio r/R at external voltages V/Vc=1.0239. Black, red, and blue lines represent the incident frequencies ℏω=3.85 eV, ℏω=4.15 eV, and ℏω=4.85 eV, respectively. (b) gy as a function of the external voltage V/Vc when the incident wave frequency is ℏω=4.0 eV. Black square, red circle, blue triangle, and green triangle lines represent Ag sphere radius r=11, 12, 13, and 14 nm, respectively.

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Fig. 6. (a) Transverse asymmetry parameter gy as a function of incident frequency. The red and black lines indicate the centrosymmetry and non-centrosymmetry cases, respectively. (b), (c) and (d) Electric field intensity for the points A, B, and C, respectively, in (a). (e), (f), and (g) Corresponding time-average scattering Poynting vector. The triangle structure is shown in the inset of (a). The value of external voltage is V/Vc=1.0239. The radii of the Ag spheres are r=20 nm; other parameters are described in the text.

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Fig. 7. Transverse asymmetry parameter gy as a function of (a) the ratio r/R and (b) external voltages for the triangle system as shown in the inset of (b). The linearly polarized wave LP10 propagates along the x axis. Three Ag spheres are tangent to the LC cell. The other parameters are described in the text. (a) Solid lines and dashed lines represent the external voltages V/Vc=1.0239 and 1.9529, respectively. Black, red, and blue curves denote the incident frequencies ℏω=3.6 eV, ℏω=3.63 eV, and ℏω=3.66 eV, respectively. (b) Green square, orange circle, and pink triangle lines represent the incident frequencies ℏω=3.61 eV, ℏω=3.63 eV, and ℏω=3.65 eV, respectively. The other parameters in (b) are consistent with the vertical light green line in (a).

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Jinhua Li, Xiangdong Zhang. Electric field tunable strong transverse light current from nanoparticles embedded in liquid crystal[J]. Photonics Research, 2018, 6(6): 06000630.

Electric field tunable strong transverse light current from nanoparticles embedded in liquid crystal

Fig. 1. Geometry of the scattering problem for an ensemble of N spheres embedded in an LC cell. Here, θ and φ denote the polar and azimuthal angles of the wave vector k→, respectively. The α represents tilt angle between the principal axis of the nematic LC molecule and the x axis.

Fig. 3. In the x–y plane, the distributions of the electric field intensity (a), (b), and (c) correspond to the points A, B, and C in Fig. 2(b), respectively. (d), (e), and (f) show the time-average scattering Poynting vector distributions of points A, B, and C separately.

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Electric field tunable strong transverse light current from nanoparticles embedded in liquid crystal

Fig. 1. Geometry of the scattering problem for an ensemble of N spheres embedded in an LC cell. Here, θ and φ denote the polar and azimuthal angles of the wave vector k→, respectively. The α represents tilt angle between the principal axis of the nematic LC molecule and the x axis.

Fig. 3. In the x–y plane, the distributions of the electric field intensity (a), (b), and (c) correspond to the points A, B, and C in Fig. 2(b), respectively. (d), (e), and (f) show the time-average scattering Poynting vector distributions of points A, B, and C separately.

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