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Tang DL, Shao ZL, Xie X, Zhou YJ, Zhang XH et al. Flat multifunctional liquid crystal elements through multi-dimensional information multiplexing. Opto-Electron Adv 6, 220063 (2023). doi: 10.29026/oea.2023.220063
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Flat multifunctional liquid crystal elements through multi-dimensional information multiplexing
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Abstract
Flat optical elements have attracted enormous attentions and act as promising candidates for the next generation of optical components. As one of the most outstanding representatives, liquid crystal (LC) has been widely applied in flat panel display industries and inspires the wavefront modulation with the development of LC alignment techniques. However, most LC elements perform only one type of optical manipulation and are difficult to realize the multifunctionality and light integration. Here, flat multifunctional liquid crystal elements (FMLCEs), merely composed of anisotropic LC molecules with space-variant orientations, are presented for multichannel information manipulation by means of polarization, space and wavelength multiplexing. Specifically, benefiting from the unique light response with the change of the incident polarization, observation plane, and working wavelength, a series of FMLCEs are demonstrated to achieve distinct near- and far-field display functions. The proposed strategy takes full advantage of basic optical parameters as the decrypted keys to improve the information capacity and security, and we expect it to find potential applications in information encryption, optical anti-counterfeiting, virtual/augmented reality, etc.-
Keywords:
- multifunctional /
- liquid crystal /
- holography /
- information multiplexing
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References
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Tang DL, Shao ZL, Xie X, Zhou YJ, Zhang XH et al. Flat multifunctional liquid crystal elements through multi-dimensional information multiplexing. Opto-Electron Adv 6, 220063 (2023). doi: 10.29026/oea.2023.220063
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Figure 1.
Principle of a multifunctional LC element utilizing the incident polarization, observation position and working wavelength to decode their associated information. Information multiplexing FMLCE generates a pattern at the sample surface under an orthogonal-polarization optical path, and different holographic images in Fresnel region depending on the incident polarization state (polarization channel), observation position (space channel), and working wavelength (wavelength channel).
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Figure 2.
Flowchart of designing a multifunctional LC element for simultaneous near-field display and far-field holography. (a) Schematic of the anisotropic LC molecule. (b) Normalized transmitted intensity follows the relation of sin2(2θ) under an orthogonal-polarization optical path. (c) Phase of the transmitted component follows the linear relation of 2θ or −2θ when LCP or RCP illumination is converted to its cross-polarized light. (d) LC orientation has four options for an equal intensity under an orthogonal-polarization optical path but provides different geometric phase shifts under LCP and RCP illumination. With the powerful GA optimization to compare the difference between the possible holographic image and target far-field image, a suitable LC orientation arrangement can be obtained. Target far-field images can be chosen with various polarization, position and wavelength information.
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Figure 3.
Experimental results of the polarization multiplexing LC element. (a) Home-built experimental setups for near-field and far-field measurements. (b) Measured results of FMLCE A at the wavelengths of 638 nm, 520 nm and 445 nm, respectively. The element can generate a near-field pattern (and its complementary pattern) under an orthogonal-polarization optical setup, and two different far-field holographic images under LCP and RCP illuminations. Scalar bars are 300 μm.
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Figure 4.
Experimental results of the space multiplexing FMLCE B at the wavelengths of 638 nm, 520 nm and 445 nm. It can generate a near-field pattern under an orthogonal-polarization optical setup, and two far-field holographic images at two different space positions under circular polarized illuminations. Scalar bars are 300 μm.
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Figure 5.
Simulated and experimental results of the wavelength multiplexing LC element. (a–d) represent the simulation results and (e–h) represent the experimental results. FMLCE C generates (a, e) a near-field pattern under an orthogonal-polarization optical path and far-field holographic images containing, (b, f) an English alphabet of “A” under red LCP illumination, (c, g) an English alphabet of “B” under green LCP illumination, and (d, h) an English alphabet of “C” under blue LCP illumination. Three holographic images are observed at the same plane. The polarizer and analyzer are orthogonal and indicated by double-ended arrows. Scalar bars are 300 μm.
