2 results about "Exit angle" patented technology

This invention belongs to the field of micro-nano photonics technology and discloses a metasurface and its design method, as well as a holographic imaging method. The invention first constructs the basic structure of the metasurface, including a substrate layer, a waveguide layer, and a structural layer. The substrate layer and waveguide layer are divided into unit cells of uniform size, and the structural layer includes several nanobricks, with one nanobrick disposed on the working surface of each unit cell. Using the directions parallel to the two edges of the working surface of the unit cell as the x-axis and y-axis, the displacement of each nanobrick within its unit cell along the x-axis and y-axis is determined based on the phase modulation values ​​corresponding to multiple two-dimensional diffraction orders. After incident light is incident on the metasurface provided by this invention, a camera captures multi-order holographic images; wherein, different holographic images are captured at different exit angles under different second-order diffraction orders. This invention can broaden the encoding capacity and expand the field of view under relaxed processing conditions.

A retro-reflector comprising a front boundary surface configured for entry of measuring light into the retro-reflector and a back boundary surface configured for reflecting the measuring light as reflected measuring light. The front boundary surface and the back boundary surface are arranged on opposite sides of the retro-reflector, and an optical axis is defined by the arrangement of the front boundary surface and / or the back boundary surface of the retro-reflector, wherein an incidence angle of the measuring light relative to the optical axis is equal to an exit angle of the reflected measuring light relative to the optical axis. A first optical element is provided comprising the front boundary surface, and a second optical element is provided comprising the back boundary surface.