Patent ID: 11971643
Assignee: HAMAMATSU PHOTONICS K.K.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 9:
10. A reflective dynamic metasurface, comprising:
a laminated structure body including a first surface through which light with a predetermined wavelength can pass in both directions, a second surface opposing the first surface, a transparent conductive layer having transmittivity to the light and arranged between the first surface and the second surface, and a dielectric layer having transmittivity to the light and arranged between the first surface and the second surface, the laminated structure body in which a pixel region is set, the pixel region including at least a plurality of pixels constituting a one-dimensional array when the first surface is viewed along a lamination direction from the first surface to the second surface;
a first metal film disposed on the first surface of the laminated structure body;
a second metal film disposed on the second surface of the laminated structure body so as to sandwich the plurality of pixels together with the first metal film, the second metal film reflecting, towards the first surface, the light passing through the first surface; and
a drive circuit configured to control voltage applied between the first metal film and the second metal film, wherein
the first metal film is disposed on the first surface so that a pair of window regions separated from each other in a state of sandwiching at least a part of the first metal film are exposed in each of the plurality of pixels when the first surface is viewed along the lamination direction,
at least the second metal film includes a plurality of partial metal films each defining a barycentric position and a shape of the associated pixel of the plurality of pixels on the second surface,
the plurality of partial metal films are disposed on the second surface in a state of being separated from each other by a predetermined distance and electrically separated from each other,
the drive circuit has a structure in which potentials of at least the plurality of partial metal films corresponding one-to-one to the plurality of pixels are individually controlled, in order to modulate a phase of the light for each of the plurality of pixels, and
an array direction of the pair of window regions on the first surface coincides with a polarization direction of the light.