Imaging of Variable Focusing Liquid Crystal Microlens Array

Fig. 1. Liquid crystal microlens array. (a) Liquid crystal microlens array structure; (b) periodic ITO electrode arrangement; (c) single electrode structure

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Fig. 2. Phase modulation of liquid crystal materials as a function of applied voltage

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Fig. 3. Simulation of voltage of microlens array. (a) Simulation modeling; (b) distribution of potential difference at the intersection of two base plates; (c) single lens voltage parabolic fitting

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Fig. 4. Microlens array interference fringes

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Fig. 5. Variation of microlens optical power with $V_{c}$

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Fig. 6. Schematic diagram of experimental setup

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Fig. 7. Resolution plate imaging results under different voltages. (a) Complete imaging result when $V_{c} = 1.7 V_{r m s}$ ; (b) partial imaging result when $V_{c} = 1.6 V_{r m s}$ ; (c) partial imaging result when $V_{c} = 1.7 V_{r m s}$ ; (d) partial imaging result when $V_{c} = 1.8 V_{r m s}$

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Fig. 8. Quantum conversion efficiency of CMOS red green blue filter for continuous wavelength bands^[35]

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Fig. 9. Resolution board imaging results. Partial imaging results under the red channel when (a) $V_{c} = 1.6 V_{r m s}$ , (b) $V_{c} = 1.7 V_{r m s}$ , and (c) $V_{c} = 1.8 V_{r m s}$ ; partial imaging results under the green channel when (d) $V_{c} = 1.6 V_{r m s}$ , (e) $V_{c} = 1.7 V_{r m s}$ , and (f) $V_{c} = 1.8 V_{r m s}$ ; partial imaging results under the blue channel when (g) $V_{c} = 1.6 V_{r m s}$ , (h) $V_{c} = 1.7 V_{r m s}$ , and (i) $V_{c} = 1.8 V_{r m s}$

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Fig. 10. Imaging results of linear operation resolution board. Results under the red channel when (a) $V_{c} = 1.6 V_{r m s}$ , (b) $V_{c} = 1.7 V_{r m s}$ , and (c) $V_{c} = 1.8 V_{r m s}$ ; imaging results under the green channel when (d) $V_{c} = 1.6 V_{r m s}$ , (e) $V_{c} = 1.7 V_{r m s}$ , and (f) $V_{c} = 1.8 V_{r m s}$ ; imaging results under the blue channel when (g) $V_{c} = 1.6 V_{r m s}$ , (h) $V_{c} = 1.7 V_{r m s}$ , and (i) $V_{c} = 1.8 V_{r m s}$

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Fig. 11. Partial imaging results under different conditions. (a) Imaging result of white light focusing section; (b) directly synthesizing partial imaging result in the red, green, and blue bands of focus; (c) synthetic partial imaging results after focusing on the red, green, and blue bands

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Fig. 12. Reconstruct resolution board images. (a) Reconstructed overall image; (b) reconstructed imaging results of the white light focusing part; (c) reconstructed partial imaging result after direct synthesis at the focused red, green, and blue bands; (d) reconstructed imaging result of the synthesized part after focusing at the red, green, and blue bands

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Fig. 13. Modulation transfer function diagram

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Table 1. Grayscale values of red, green, and blue filters when light with different wavelengths is incident on CMOS
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Table 1. Grayscale values of red, green, and blue filters when light with different wavelengths is incident on CMOS
Filter type Red filter Green filter Blue filter
Red light 152 58 27
Green light 62 151 74
Blue light 48 59 158

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Dawei Gan, Zhiqiang Liu, Wenbin Feng, Jiayi Wang, Mao Ye. Imaging of Variable Focusing Liquid Crystal Microlens Array[J]. Acta Optica Sinica, 2024, 44(16): 1611002

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