Guided resonance dielectric filter systems

An apparatus for filtering electromagnetic radiation comprising a plurality of dielectric structures with periodic refractive index contrast therein, each of said structures having parameters such that at least two guided resonance modes exist in the structure when electromagnetic radiation is passed through the structure, wherein the at least two modes have substantially the same frequency and width but different symmetries, and wherein each of said structures exhibits substantially all-pass transmission characteristics over a corresponding bandwidth and introduces a delay of frequency components at or near a resonance frequency of the corresponding one of the plurality of dielectric structure relative to other frequency components in its corresponding bandwidth

• wherein said plurality of dielectric structures are in a cascaded arrangement to receive electromagnetic radiation sequentially.

A filter comprising:

• a dielectric structure with periodic refractive index contrast therein, said structure having parameters such that at least two guided resonance modes exist in the structure when electromagnetic radiation is incident on the structure, wherein the at least two modes have substantially the same frequency and width but different symmetries, and wherein the filter exhibits substantially all-pass transmission characteristics over a bandwidth and introduces a delay of frequency components at or near a resonance frequency of the structure relative to other frequency components in the bandwidth;
• and
• a component directing electromagnetic radiation to the structure.

A method for filtering electromagnetic radiation comprising:

• providing a dielectric structure with periodic refractive index contrast therein, said structure having parameters such that at least two guided resonance modes exist in the structure when electromagnetic radiation is incident on the structure, wherein the at least two modes have substantially the same frequency and width but different symmetries, and wherein the filter exhibits substantially all-pass transmission characteristics over a bandwidth and introduces a delay of frequency components at or near a resonance frequency of the structure relative to other frequency components in the bandwidth;
• and
• directing electromagnetic radiation to the structure.

A filter comprising a photonic crystal dielectric structure with periodic refractive index contrast therein, said structure having parameters such that at least two guided resonance modes exist in the structure when electromagnetic radiation is incident on the structure, wherein the at least two modes have substantially the same frequency, width and symmetry, and wherein the filter exhibits substantially flat top reflection characteristics at or near resonance frequencies of the structure over a bandwidth.

A filter comprising:

• a dielectric photonic crystal structure with periodic refractive index contrast therein, said structure having parameters such that two guided resonance modes exist in the structure when electromagnetic radiation is incident on the structure, wherein the at least two modes have substantially the same frequency, width and symmetry, and wherein the filter exhibits substantially flat top reflection characteristics at or near resonance frequencies of the structure over a bandwidth;
• and
• a component directing electromagnetic radiation to the structure.

A filter comprising a dielectric two-dimensional grating structure, said structure having parameters such that at least two guided resonance modes exist in the structure when electromagnetic radiation is incident on the structure, wherein the at least two modes have substantially the same frequency, width and symmetry, and wherein the filter exhibits substantially flat top reflection characteristics at or near resonance frequencies of the structure over a bandwidth.