Lin Zhu, Yiheng Zhang, Shijun Ge, Peng Chen, Yanqing Lu, "Optical properties of stacked liquid crystal superstructures with opposite chirality [Invited]," Chin. Opt. Lett. 22, 061601 (2024)

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- Chinese Optics Letters
- Vol. 22, Issue 6, 061601 (2024)

Fig. 1. Schematics of (a) common cholesteric liquid crystals (CLCs) and (b)–(e) four stacked CLC superstructures. The blue and yellow spirals represent right-handed and left-handed CLC, respectively. D means the thickness of the cell. A means the thickness of the smallest repeating unit. The z-axis is along the helical axis.

Fig. 2. (a), (f) The reflection spectrum and the phase of Ex component of the light reflected from right-handed CLC. (b)–(e) The reflectance spectra and (g)–(j) the polarization of the light reflected from four stacked CLC models. The stacked CLCs are (b), (g) A = D, (c), (h) A = D/2, (d), (i) A = D/4, and (e), (j) A ≈ 0, respectively.
![The optical properties of (a), (f), (k) the right-handed CLC and the stacked CLCs with (b), (g), (l) A = D, (c), (h), (m) A = D/2, (d), (i), (n) A = D/4, and (e), (j), (o) A ≈ 0, respectively. (a)–(e) The reflectance spectra after an x-directional analyzer dependent on α and λ. (f)–(j) The section at α = π/2, and (k)–(o) the section at λ = 633 nm [blue dashed lines in (a)–(e)], where the red/blue curves represent the reflectance without analyzer/with an x-directional analyzer, respectively.](/Images/icon/loading.gif)
Fig. 3. The optical properties of (a), (f), (k) the right-handed CLC and the stacked CLCs with (b), (g), (l) A = D, (c), (h), (m) A = D/2, (d), (i), (n) A = D/4, and (e), (j), (o) A ≈ 0, respectively. (a)–(e) The reflectance spectra after an x-directional analyzer dependent on α and λ. (f)–(j) The section at α = π/2, and (k)–(o) the section at λ = 633 nm [blue dashed lines in (a)–(e)], where the red/blue curves represent the reflectance without analyzer/with an x-directional analyzer, respectively.

Fig. 4. The polarization distribution and diffracted optical field of the three patterned CLC stacks: (b)–(e) A = D, (f)–(i) A = D/4, and (j)–(m) A ≈ 0. (a) The designed surface CLC alignment and phase pattern. (b), (f), (j) Schematics of three stacked CLC models, corresponding to Figs. 1(b) , 1(d) , 1(e) , respectively. (c), (g), (k) Reflectance spectra of the three CLC models corresponding to Figs. 2(b) , 2(d) , 2(e) , respectively. The polarization distribution and the diffracted optical field with/without analyzer for the generated vector beams at (d), (h), (l) 633 nm and (e), (i), (m) 650 nm, respectively. The white/yellow arrows represent the incident polarizer/analyzer, respectively. The white dashed lines indicate the position of π/2 polarization.

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