Isotropic Filters in Spatial Frequency Domain by a Photonic Crystal Slab

8) A method of making an isotropic image filter comprising a photonic crystal slab, comprising:

• designing a photonic crystal slab having a periodic lattice of air through holes, wherein parameters of a photonic crystal slab design include a dielectric constant, a thickness, a through hole radius and a lattice constant;
• wherein the periodic lattice of air holes are separated according to a value of the lattice constant;
• wherein the thickness and the hole radius are configured such that the photonic crystal slab generates isotropic guided resonances;
• and
• making a photonic crystal slab according to the photonic crystal slab design.

15) A method of making an isotropic image filter comprising a photonic crystal slab, comprising:

• designing a photonic crystal slab having a periodic lattice of air through holes, wherein parameters of the photonic crystal slab include a dielectric constant, a thickness, a through hole radius and a lattice constant;
• wherein the periodic lattice of air holes are separated according to a value of the lattice constant;
• wherein the thickness and the hole radius are configured such that the photonic crystal slab generates isotropic image filtering;
• and
• making a photonic crystal slab according to the photonic crystal slab design.