![]() ![]() Therefore, it is challenging to create a compact, low-cost, and lightweight device with conventional refractive optics, and a large volume and heavy weight of the optical system is inevitable. Typically, these refractive optical elements rely on the phase accumulation along light propagation to realize light bending. To correct the chromatic aberration and extend field of view, a combination of multiple curved lenses should be appropriately considered and arranged thereby commercial achromatic lenses or wide-angle lenses are developed. For example, a lens, shaping the incident phase profile and focusing light into a tiny spot, has been widely used in our daily life, such as the camera of a smartphone and microscope objective. ![]() The control of light has always played an important role in both science and our daily life. We expect the proposed multifunctional LC elements can find applications in information multiplexing, image displaying, etc. Furthermore, as the complex amplitude modulation changes from sine to cosine function after rotating the sample by 45°, a bifocal lens with two different focal lengths is also demonstrated. The element with millimeter size is then fabricated, and the experimental measurements agree well with our design with a high-definition surface pattern and high-quality optical focusing/imaging performance. The light modulation of the anisotropic LC molecule satisfies a sinusoidal variation, which can be regarded as the combination of a continuous amplitude modulation and a binary phase modulation. In this work, we propose a multifunctional LC element which integrates the surface display into a binary-phase focusing lens by controlling the complex amplitude of the incident light. However, previous researches on LC elements mainly involved only one type of optical manipulation, which inevitably limited the functional diversity. Liquid crystals (LCs) are well known for their applications in the current displaying field, and show great potential in planar optical elements with the development and innovation of LC micro-operation technology. Planar optical elements have attracted widespread attentions because of their precise light modulation. ![]()
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