[1] Sato S. Applications of liquid crystals to variable-focusing lenses[J]. Optical Review, 6, 471-485(1999).

[2] Xu R Q, Kong M M, Zhang H C et al. Experimental research on reducing zoom time of electrowetting liquid lenses[J]. Acta Optica Sinica, 40, 1322003(2020).

[3] Cheng Y, Cao J, Wang Y B et al. Design and analysis of liquid lens driven by dielectric elastomer[J]. Acta Optica Sinica, 41, 0522004(2021).

[4] Ye M, Wang B, Uchida M et al. Focus tuning by liquid crystal lens in imaging system[J]. Applied Optics, 51, 7630-7635(2012).

[5] Ye M, Wang B, Takahashi T et al. Properties of variable-focus liquid crystal lens and its application in focusing system[J]. Optical Review, 14, 173-175(2007).

[6] Lan T C, Lan R H, Chen X X et al. Research on liquid crystal lens hill climbing autofocus algorithm[J]. Acta Optica Sinica, 40, 1411003(2020).

[7] Ye M, Noguchi M, Wang B et al. Zoom lens system without moving elements realised using liquid crystal lenses[J]. Electronics Letters, 45, 646-648(2009).

[8] Lin Y H, Chen M S, Lin H C. An electrically tunable optical zoom system using two composite liquid crystal lenses with a large zoom ratio[J]. Optics Express, 19, 4714-4721(2011).

[9] Li H, Pan F, Wu Y T et al. Depth map sensor based on optical doped lens with multi-walled carbon nanotubes of liquid crystal[J]. Applied Optics, 55, 140-147(2015).

[10] Ye M, Chen X X, Li Q C et al. Depth from defocus measurement method based on liquid crystal lens[J]. Optics Express, 26, 28413-28420(2018).

[11] Ye M, Sato S. Liquid crystal lens with insulator layers for focusing light waves of arbitrary polarizations[J]. Japanese Journal of Applied Physics, 42, 6439-6440(2003).

[12] Ren H W, Lin Y H, Wu S T. Polarization-independent and fast-response phase modulators using double-layered liquid crystal gels[J]. Applied Physics Letters, 88, 061123(2006).

[13] Ye M, Wang B, Sato S. Polarization-independent liquid crystal lens with four liquid crystal layers[J]. IEEE Photonics Technology Letters, 18, 505-507(2006).

[14] Chen H S, Wang Y J, Chang C M et al. A polarizer-free liquid crystal lens exploiting an embedded-multilayered structure[J]. IEEE Photonics Technology Letters, 27, 899-902(2015).

[15] Lin Y H, Chen H S, Lin H C et al. Polarizer-free and fast response microlens arrays using polymer-stabilized blue phase liquid crystals[J]. Applied Physics Letters, 96, 113505(2010).

[16] Li Y, Wu S T. Polarization independent adaptive microlens with a blue-phase liquid crystal[J]. Optics Express, 19, 8045-8050(2011).

[17] Lin C H, Wang Y Y, Hsieh C W. Polarization-independent and high-diffraction-efficiency Fresnel lenses based on blue phase liquid crystals[J]. Optics Letters, 36, 502-504(2011).

[18] Bao R, Cui C H, Yu S et al. Polarizer-free imaging of liquid crystal lens[J]. Optics Express, 22, 19824-19830(2014).

[19] Cui C H, Bao R, Yu S D et al. Polarizer-free imaging using reference image for liquid crystal lens[J]. Optics Communications, 342, 214-217(2015).

[20] Bai Y C, Chen X X, Zeng J et al. An optimization algorithm for polarizer-free imaging of liquid crystal lens[J]. Acta Optica Sinica, 38, 0815015(2018).

[21] Cui C H, Bao R, Yu S D et al. 19.4: denoising for polarizer-free imaging of liquid crystal lens[J]. Sid Symposium Digest of Technical Papers, 46, 262-265(2015).

[22] Saito S, Kawamura M, Sato S et al[2021-09-06]. Microscope system with a TN LC cell and an LC lens [2021-09-06].https:∥confit.atlas.jp/guide/event-img/jsap2016a/15p-C42-11/public/pdf..

[23] Khoo I C, Wu S T. Optics and nonlinear optics of liquid crystals[M]. Singapore: World Scientific(1993).

[24] Liu X H, Tanaka M, Okutomi M. Noise level estimation using weak textured patches of a single noisy image[C]∥2012 19th IEEE International Conference on Image Processing, September 30-October 3, 2012, Orlando, FL, USA., 665-668(2012).

[25] Ye M, Wang B, Sato S. Liquid-crystal lens with a focal length that is variable in a wide range[J]. Applied Optics, 43, 6407-6412(2004).

[26] Rank K, Lendl M, Unbehauen R. Estimation of image noise variance[J]. IEE Proceedings-Vision, Image, and Signal Processing, 146, 80-84(1999).