Efficient bandpass reflection and transmission filters with low sidebands based on guided-mode resonance effects
First Claim
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1. An ideal or near ideal, multiple-layer, guided-mode, reflection, resonance filter for use with an input wave having a resonant wavelength, said filter comprising:
- a cover having a cover permittivity;
a substrate having a substrate permittivity;
at least one unmodulated layer of homogenous, dielectric material having a thickness near either 1/4 or 1/2 of said wavelength;
at least one modulated layer of an arbitrarily ordered grating adjacent to said at least one unmodulated layer and having a thickness near either 1/4 or 1/2 of said wavelength; and
wherein at least one of any said layer has a permittivity greater than both said substrate permittivity and said cover permittivity.
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Abstract
Ideal or near ideal filter for reflecting or transmitting electromagnetic waves having wavelength range of approximately 100 nm to 10 cm are disclosed. These filters combine a dielectric multilayer structure with a resonant waveguide grating and they are valid for both TE and TM polarized waves. High efficiency, arbitrarily narrow band, polarized, filters with low sidebands over extended wavelength ranges can be obtained.
265 Citations
29 Claims
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1. An ideal or near ideal, multiple-layer, guided-mode, reflection, resonance filter for use with an input wave having a resonant wavelength, said filter comprising:
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a cover having a cover permittivity; a substrate having a substrate permittivity; at least one unmodulated layer of homogenous, dielectric material having a thickness near either 1/4 or 1/2 of said wavelength; at least one modulated layer of an arbitrarily ordered grating adjacent to said at least one unmodulated layer and having a thickness near either 1/4 or 1/2 of said wavelength; and
wherein at least one of any said layer has a permittivity greater than both said substrate permittivity and said cover permittivity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An ideal or near ideal, multiple-layer, guided-mode, transmission, resonance filter for use with an input wave having a resonance wavelength, said filter comprising:
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a cover having a cover permittivity; a substrate having a substrate permittivity; at least one unmodulated layer of homogenous, dielectric material having a thickness near either 1/4 or 1/2 of said wavelength; at least one modulated layer of an arbitrarily ordered grating adjacent to said at least one unmodulated layer and having a thickness near either 1/4 or 1/2 of said wavelength; and wherein at least one of any said layer has a permittivity greater than both said substrate permittivity and said cover permittivity, and wherein said permittivities of all said layers alternate from high to low. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An ideal or near ideal, multiple-layer, guided-mode, reflection, resonance filter for use with an input wave having a resonant wavelength, said filter comprising:
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a cover having a cover permittivity; a substrate having a substrate permittivity; at least one unmodulated layer of homogenous, dielectric material having a thickness near either 1/4 or 1/2 of said wavelength; at least one modulated layer of an arbitrarily ordered grating adjacent to said at least one unmodulated layer and having a thickness near either 1/4 or 1/2 of said wavelength; wherein at least one of any said layer has a permittivity greater than both said substrate permittivity and said cover permittivity; and wherein said at least one modulated layer comprises two such layers which are spatially shifted relative to one another. - View Dependent Claims (29)
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Specification