Metasurface and reflecting system

A metasurface comprising:

• a first substrate;
• a plurality of resonant cells arranged on a first main surface of the first substrate, each of the plurality of resonant cells including a dielectric having a variable dielectric constant and a pair of metal patterns sandwiching the dielectric, each of the plurality of resonant cells having a resonant frequency that changes according to the dielectric constant, and each of the plurality of resonant cells reflecting electromagnetic waves having a frequency corresponding to the resonant frequency;
• and
• a reflective film formed on a second main surface of the first substrate opposite to the first main surface, the reflective film reflecting electromagnetic waves that are not reflected by the plurality of resonant cells and that are transmitted through the first substrate.

A reflection system comprising:

• a metasurface comprising:
• a first substrate;
• a plurality of resonant cells arranged on a first main surface of the first substrate, each of the plurality of resonant cells including a dielectric having a variable dielectric constant and a pair of metal patterns sandwiching the dielectric, each of the plurality of resonant cells having a resonant frequency that changes according to the dielectric constant, and each of the plurality of resonant cells reflecting electromagnetic waves having a frequency corresponding to the resonant frequency;
• and
• a reflective film formed on a second main surface of the first substrate opposite to the first main surface, the reflective film reflecting electromagnetic waves that are not reflected by the plurality of resonant cells and that are transmitted through the first substrate;
• and
• a control circuit that controls the dielectric constant for each of a predetermined number of resonant cells among the plurality of resonant cells and controls a phase distribution of electromagnetic waves in a specific frequency band reflected by the metasurface.

A method, comprising:

• providing a metasurface including a first substrate, a plurality of resonant cells arranged on a first main surface of the first substrate, each of the plurality of resonant cells including a dielectric having a variable dielectric constant and a pair of metal patterns sandwiching the dielectric, each of the plurality of resonant cells having a resonant frequency that changes according to the dielectric constant, and each of the plurality of resonant cells reflecting electromagnetic waves having a frequency corresponding to the resonant frequency, and a reflective film formed on a second main surface of the first substrate opposite to the first main surface, the reflective film reflecting electromagnetic waves that are not reflected by the plurality of resonant cells and that are transmitted through the first substrate;
• controlling the dielectric constant for each of a predetermined number of resonant cells among the plurality of resonant cells;
• and
• controlling a phase distribution of electromagnetic waves in a specific frequency band reflected by the metasurface.