DIFFRACTION GRATINGS FOR BEAM REDIRECTION
First Claim
Patent Images
1. A diffraction grating comprising:
- a first grating structure having a first spatial variation of optical permittivity, wherein the first spatial variation has a first grating pitch and a wavelength-dependent first amplitude, such that at a first wavelength, the first amplitude is above a first threshold and at a second wavelength, the first amplitude is below a second threshold, wherein the second threshold is lower than the first threshold; and
a second grating structure having a second spatial variation of optical permittivity, wherein the second spatial variation has a second grating pitch and a wavelength-dependent second amplitude, such that at the first wavelength, the second amplitude is below the second threshold and at the second wavelength, the second amplitude is above the first threshold.
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Abstract
A diffraction grating with independently controlled diffraction angles for optical beams at different wavelengths may be used to redirect and couple light to a waveguide in an efficient, space-saving manner. The diffraction grating can include a layer with optical permittivity and associated index contrast of the grating grooves at different grating periods dependent on wavelength.
12 Citations
34 Claims
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1. A diffraction grating comprising:
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a first grating structure having a first spatial variation of optical permittivity, wherein the first spatial variation has a first grating pitch and a wavelength-dependent first amplitude, such that at a first wavelength, the first amplitude is above a first threshold and at a second wavelength, the first amplitude is below a second threshold, wherein the second threshold is lower than the first threshold; and a second grating structure having a second spatial variation of optical permittivity, wherein the second spatial variation has a second grating pitch and a wavelength-dependent second amplitude, such that at the first wavelength, the second amplitude is below the second threshold and at the second wavelength, the second amplitude is above the first threshold. - View Dependent Claims (2, 4, 5, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19)
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3. (canceled)
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6. (canceled)
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11. (canceled)
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20-29. -29. (cancelled)
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30. A diffraction grating comprising a layer of material with a spatially varying optical permittivity dependent on wavelength, such that:
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at a first wavelength, the spatially varying optical permittivity comprises a plurality of peaks and valleys at a first pitch; and at a second, different wavelength, the spatially varying optical permittivity comprises a plurality of peaks and valleys at a second, different pitch. - View Dependent Claims (31, 32, 33)
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34-60. -60. (canceled)
Specification