Combination optical filter and diffraction grating and associated systems and methods
Optical components and systems comprising combined optical filters and diffraction gratings are generally described. In certain embodiments, an optical filter is in contact with a diffraction grating. In certain embodiments, the optical filter and the diffraction grating can be used to diffract and direct a first portion of electromagnetic radiation incident upon the grating and filter toward a receiver while filtering a second portion of the electromagnetic radiation incident upon the grating and filter.
1. An optical component, comprising:
a diffraction grating comprising a grating surface; and
an absorptive optical filter comprising a first outer surface in direct contact with the grating surface of the diffraction grating and a second outer surface opposite the first outer surface, the second outer surface parallel, within 2 degrees, to the grating surface of the diffraction grating;
wherein the optical component has a modulus of rigidity of at least about 10 GPa, and
the absorptive optical filter is configured such that the intensity of at least one wavelength of visible electromagnetic radiation that is transmitted through the absorptive optical filter is less than about 10% of the intensity of the at least one wavelength of the visible electromagnetic radiation originally incident upon the absorptive optical filter.
2. The optical component of claim 1 , wherein the absorptive optical filter comprises a matrix material and an additive dispersed within the matrix material and configured to absorb the at least 90% of the at least one wavelength of visible electromagnetic radiation.
3. The optical component of claim 2 , wherein the matrix material comprises a polymer.
4. The optical component of claim 3 , wherein the polymer comprises a thermoset polymer.
5. The optical component of claim 2 , wherein the additive comprises a dye.
6. The optical component of claim 1 , wherein the grating surface of the diffraction grating comprises a plurality of substantially parallel and/or concentric, periodically spaced grating features.
7. The optical component of claim 1 , wherein the absorptive optical filter is configured such that the intensity of at least one wavelength of electromagnetic radiation from about 350 nm to about 800 nm that is transmitted through the absorptive optical filter is less than about 10% of the intensity of the at least one wavelength of the electromagnetic radiation from about 350 nm to about 800 nm originally incident upon the absorptive optical filter.
8. The optical component of claim 1 , wherein the second outer surface of the absorptive optical filter is substantially planar.
9. The optical component of claim 1 , wherein the first outer surface of the absorptive optical filter conforms to grating features of the grating surface.
10. A system, comprising:
an optical component, comprising:
a diffraction grating comprising a grating surface; and
an absorptive optical filter in contact with the diffraction grating, the absorptive optical filter comprising an absorptive medium having a first outer surface facing the diffraction grating and a second outer surface opposite the first outer surface; and
a receiver;
wherein:
the absorptive optical filter is configured to transmit a first portion of electromagnetic radiation incident upon the absorptive optical filter and to absorb a second portion of the electromagnetic radiation incident upon the absorptive optical filter;
the diffraction grating is configured to receive electromagnetic radiation from and/or transmit electromagnetic radiation to the absorptive optical filter;
the diffraction grating is configured to diffract at least part of the first portion of electromagnetic radiation incident upon the diffraction grating to produce non-zero-order diffracted electromagnetic radiation;
the receiver is configured to receive at least part of the non-zero-order diffracted electromagnetic radiation from the diffraction grating;
the first and/or second outer surfaces of the absorptive medium of the absorptive optical filter are parallel, within 2 degrees, to the grating surface of the diffraction grating; and
the optical component has a modulus of rigidity of at least about 10 GPa.
11. The system of claim 10 , wherein at least one of the absorptive optical filter and the diffraction grating comprises a ceramic.
12. The system of claim 11 , wherein the ceramic comprises a silicon oxide, an aluminum oxide, a magnesium oxide, a zirconium oxide, a silicon carbide, an aluminum carbide, a magnesium carbide, a zirconium carbide, a silicon nitride, an aluminum nitride, a magnesium nitride, and/or a zirconium nitride.
13. The system of claim 10 , wherein at least one of the absorptive optical filter and the diffraction grating comprise a glass.
14. The system of claim 10 , wherein at least one of the absorptive optical filter and the diffraction grating comprises a metal.
15. The system of claim 14 , wherein the metal comprises aluminum, nickel, copper, titanium, iron, and/or chromium.
16. The system of claim 10 , wherein the absorptive medium of the absorptive optical filter comprises a matrix material and an additive dispersed within the matrix material and configured to absorb at least one wavelength of electromagnetic radiation.
17. The system of claim 16 , wherein the matrix material comprises a polymer.
18. The system of claim 17 , wherein the polymer comprises an epoxy.
19. The system of claim 16 , wherein the additive comprises a dye.
20. The system of claim 10 , wherein the diffraction grating is a reflective diffraction grating.
21. The system of claim 10 , wherein the diffraction grating is a transmissive diffraction grating.
22. The system of claim 10 , wherein the grating surface of the diffraction grating comprises a plurality of substantially parallel and/or concentric, periodically spaced grating features.
23. The system of claim 22 , wherein the diffraction grating comprises a plurality of substantially linear periodic grating features.
24. The system of claim 10 , wherein the second outer surface of the absorptive medium of the absorptive optical filter is substantially planar.
25. The system of claim 10 , comprising a directional source of the first portion of electromagnetic radiation.
26. The system of claim 25 , comprising a source of the second portion of electromagnetic radiation, the source of the second portion of electromagnetic radiation being different from the directional source.
27. The system of claim 25 , wherein the direction of the directional source is configured such that the first portion of electromagnetic radiation is transmitted along a predetermined or adjusted pathway.
28. The system of claim 10 , wherein the second portion of electromagnetic radiation includes electromagnetic radiation that would spatially overlap with first order diffracted electromagnetic radiation from the first portion of electromagnetic radiation, were the absorptive optical filter not present.
29. The system of claim 10 , wherein the first outer surface of the absorptive medium of the absorptive optical filter is in direct contact with the diffraction grating.
30. The system of claim 29 , wherein the first outer surface of the absorptive medium of the absorptive optical filter conforms to grating features of the grating surface.