Surface treatments of substrates such as windows or photovoltaic devices (e.g. solar energy panels) benefit from a coating of layered anti-reflective material. Reduction of glare from light impacting glass, improved retention of natural light for energy costs, or increased absorption of light impacting a photovoltaic cell are some of the ways anti-reflective coatings are used. Conventional anti-reflective coatings provide benefits for substantially orthogonal light paths, relative to normal of a surface of a substrate, but are generally directed to maximize anti-reflection for such freespace light that anticipates origination of light completely external to a substrate. Conventional coatings also seek to increase transmission rates. Certain optical mediums manipulate light paths other than freespace origination, and antireflection coatings to optimize the performance of such mediums are needed.
Embodiments of the present invention are generally directed to specific materials and thicknesses of layers for anti-reflective coatings in optical waveguides. More specifically, the embodiments and techniques described herein relate to anti-reflective coatings that must facilitate light propagation for total internal reflection (TIR), and simultaneously minimize light reflection at orthogonal angles or other freespace light. Embodiments described herein are directed away from seeking complete transmission of light.
Some embodiments are directed to a waveguide substrate having a first index of refraction, such as glass. The substrate may be planar, or cylindrical (such as a fiber optic). For planar substrates, a plurality of diffractive optical elements, such as a grating, is disposed upon a first surface, and an anti-reflective coating is disposed upon the opposite surface. For cylindrical waveguides, an anti-reflective coating is applied to the outer surface.
In some embodiments, the waveguide is configured to receive light, and propagate it along an axis by total internal reflection. In planar waveguides, the light travels in along such an axis in a first direction, and outcouples light in a substantially orthogonal direction when the light reflects off of a diffractive optical element of that corresponding surface. In cylindrical waveguides, the light reflects along the waveguide along an axis substantially parallel to the length of the waveguides, and outcouples at a distal end.
The anti-reflective coating of such embodiments is configured to minimize the phase retardation as between the s and p polarization states of the received light, such that the angle of bounce by TIR for each polarization component of light is substantially similar.
In some embodiments, the anti-reflective coating is a single layer of magnesium fluoride (MgF2) having a thickness between 75 and 125 nanometers (nm). In some embodiments, a layer of silica (SiO2) is applied as an outer layer to the coating.
In some embodiments, the anti-reflective coating has an imaginary refractive index value (alternatively referred to herein as an absorption coefficient), k, less than 5×10−4. In some embodiments the k value of the complete coating is between 5×10−4 and 1×10−3, regardless of the number of layers comprising the coating. In some embodiments, the coating is a single layer of material. In some embodiments, the coating alternates between two materials, with one material having a comparatively higher index of refraction than the second material. In some embodiments, less than eight total layers are utilized.
In some embodiments, titania (TiO2) with an index of refraction greater than 2 is utilized as a coating layer material; in some embodiments, SiO2 with an index of refraction between 1.45 and 1.58 alternates layers with titania.
These materials and layer selections optimize the efficiency of light output by an optical waveguide, minimize phase retardation to reduce optical defects such as striations in images output by such a waveguide, and minimize the labor and material cost of conventional layers.
Antireflection coatings are generally configured to create out-of-phase reflections across layers of material with differing indices of refraction. Conventionally, single-layer anti-reflective coatings seek a refractive index, n, equal to the square root of the coated substrate's index of refraction, and with a thickness, t, equal to one quarter the wavelength, λ, of the light targeted by the anti-reflective coating.
ncoating=√(nsubstrate) Eq. 1
t=λtarget light/(4·ncoating) Eq. 2
Though the coating arrangement show in
Each exit beam is a sampled beamlet of light 400 and increases the likelihood that any one sampled beamlet will be viewed by an eye 4 of a viewer. It is critical therefore that the waveguide 1182 maintains TIR to create the plurality of exit beams across its span, otherwise the exit beams 402 would not be distributed, and the resulting exit pupil(s) would only be viewable in certain positions of eye 4, limiting the applicability and flexibility of the system.
The light bundle 3020 may cause undesirable effects if it reflects off of the subsequent waveguide 1220, such as interference with light bundle 3010, increased blurriness due to any change in angle that may result from the reflection, etc. Here, an anti-reflective coating applied to the opposite surface of a waveguide from its outcoupling diffractive optical element will be beneficial to reduce these effects. A conventional coating that attempts to increase transmission generally will, however, degrade the light paths 1240, 1242, and 1244 as they progress across waveguides 1210, 1220, and 1230 by TIR. This degradation introduces uniformity complications at outcoupling, and results in poor image quality.
Waveguide optical systems that employ pupil expander technology aggravate this problem. In a pupil expander system, such as depicted in
By breaking down the polarization into the constituent s and p states, the resulting electric field, E, is a function of amplitude, A, and phase, j, of the light, and is depicted for each s and p path as follows:
Ei,s=Ai,sejϕ
Ei,p=Ai,pejϕ
where i indicates the variables' value at input.
Each interaction (indicated by a directionality arrow below with correlation to the paths of the light at an output node of
where the left and downward are indicative of light diffracting to the left and down, as at output node 662 of
Additionally, each bounce off the AR coating can be described by a 2×2 matrix. In a planar coating, the off-diagonal elements of this matrix are 0, and the magnitude of the diagonal elements must be 1 due to the fact that, in a planar coating, the layers are parallel. Because there is no diffraction from the AR coating, there are only two of these matrices: AR↓↓ and AR←←.
The electric field state leaving the output node propagating downward (towards an exit pupil expander) can now be related to the electric field input state.
However, this may be simplified if the phase retardation (the difference between phase shifts of each of the s and p light paths at each bounce) is 0, such that (θs=θp). In this case, the anti-reflective coating no longer impacts the energy output. In other words, Eq. 6 and Eq. 7 may be replaced, respectively by:
And the output is simplified to:
Therefore, if the AR coating has no phase retardation, it only imparts a phase shift to the output, with no change of polarization state or magnitude. If the AR coating does have phase retardation, it will change the output polarization state and magnitude, and introduce negative optical effects. This is critical when determining the number of layers of an anti-reflective coating used on a TIR waveguide display device.
To minimize this degradation and reduce the amount of inter-waveguide reflections while nonetheless maintaining intra-waveguide reflections, embodiments of the present invention are directed to an optimized anti-reflective coating. Such optimization balances the index of refraction of the anti-reflective material with the number and thickness of layers applied in the coating. This will minimize the phase retardation effects by bringing θs substantially equal to θp.
In some embodiments an anti-reflective coating is applied to one side of a waveguide substrate within a waveguide stack that makes up an eyepiece of an augmented or mixed or virtual reality device. Preferably, the coated side is on the opposing side a viewer's eye is expected to be placed, though a coated side on a same side as a viewer's eye may function similarly. In some embodiments, a grating is applied to the opposite surface of the waveguide as the coated side. The anti-reflective coating preferably reduces reflection from and increases transmission through the surface to which the anti-reflective coating is applied. The anti-reflective coating preferably increases transmission of light to at least 97 percent.
The antireflection coating comprises at least one layer, but in preferred embodiments is less than eight and alternates layers of two alternating constituent materials of comparatively high and comparatively low indices of refraction. In some embodiments, one of the constituent layers is titania (TiO2). In some embodiments, one of the constituent layers is silica (SiO2).
One of skill in the art will appreciate other candidate materials, such as SiN, ZrO2, ZnO2, Ta2O5, or NB2O5 or other metal oxides with low absorption in visible wavelength range. Such materials, as with TiO2 and SiO2, are well known in the art for their use in the photovoltaic or glass treatment for anti-reflection.
In some embodiments, SiO2 is a final (i.e. top) layer of a multilayer coating as a protective layer to any wet chemistry (sulfuric acid, hydrogen peroxide, etc.) incident to waveguide cleaning, processing or patterning.
An index of refraction, n, of a material is composed from two elements, the known refractive index and the absorption coefficient k (or imaginary index of refraction that relates to the attenuation of light through the material) such that n=n+ik. Different materials have different absorption coefficients that can produce widely various results, and this is especially variable when multiple materials are layered together to create a net k value for the coating. For example, titania, a well know anti-reflective material, and silicon nitride SiN have similar reflectance spectrums for normal incidence, but slightly different k values. Though these may be negligible in normal/orthogonal light directions, at angles supporting TIR every bounce of the light at a surface is attenuated with a slightly different absorption as compared between the two materials. The cumulative effect of this slight difference of absorption coefficient in a coating that manipulates light across a plurality of bounces in a TIR system can drastically affect the overall image quality, especially uniformity and efficiency.
Using the energy output by materials of varying absorption coefficients k of various materials, the loss of light, as a percentage of output, is depicted in
In some embodiments, anti-reflective coatings with fewer than eight layers are utilized. In some embodiments, such as an MgF2 coating, only a single layer is utilized.
According to Eq. 1, a target index of refraction may be resolved by simple math, however the cumulative effect of a particular k value is not so easily derived, and in an alternating layer coating the cumulative target n may not be so straightforward either. For example, if a conventional anti-reflective coating material like titania were applied to a glass substrate, Eq.1 would not be satisfied. Glass generally has an index of refraction between 1.5 and 1.6, an anti-reflective coating on glass therefore should have an index of refraction between 1.22 and 1.27. In some embodiments of the present invention, an antireflection coating of MgF2 is applied (the index of refraction of MgF2 is 1.38) to a glass substrate.
With reference to
Reference throughout this document to “one embodiment,” “certain embodiments,” “an embodiment,” or similar term means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of such phrases in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner on one or more embodiments without limitation.
The particulars shown herein are by way of example and for purposes of illustrative discussion of the preferred embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of various embodiments of the invention. In this regard, no attempt is made to show structural details of the invention in more detail than is necessary for the fundamental understanding of the invention, the description taken with the drawings and/or examples making apparent to those skilled in the art how the several forms of the invention may be embodied in practice.
As used herein and unless otherwise indicated, the terms “a” and “an” are taken to mean “one,” “at least one” or “one or more.” Unless otherwise required by context, singular terms used herein shall include pluralities and plural terms shall include the singular.
Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise,” “comprising,” and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to.” The term “or” as used herein is to be interpreted as inclusive or meaning any one or any combination. Therefore, “A, B or C” means any of the following: A; B; C; A and B; A and C; B and C; A, B and C. An exception to this definition will occur only when a combination of elements, functions, steps or acts are in some way inherently mutually exclusive.
Words using the singular or plural number also include the plural and singular number, respectively. Additionally, the words “herein,” “above,” and “below” and words of similar import, when used in this disclosure, shall refer to this disclosure as a whole and not to any particular portions of the disclosure.
The description of embodiments of the disclosure is not intended to be exhaustive or to limit the disclosure to the precise form disclosed. While specific embodiments and examples for the disclosure are described herein for illustrative purposes, various equivalent modifications are possible within the scope of the disclosure, as those skilled in the relevant art will recognize. Such modifications may include, but are not limited to, changes in the dimensions and/or the materials shown in the disclosed embodiments.
All of the references cited herein are incorporated by reference. Aspects of the disclosure can be modified, if necessary, to employ the systems, functions, and concepts of the above references to provide yet further embodiments of the disclosure. These and other changes can be made to the disclosure in light of the detailed description.
Specific elements of any foregoing embodiments can be combined or substituted for elements in other embodiments. Furthermore, while advantages associated with certain embodiments of the disclosure have been described in the context of these embodiments, other embodiments may also exhibit such advantages, and not all embodiments need necessarily exhibit such advantages to fall within the scope of the disclosure.
Therefore, it should be understood that the invention can be practiced with modification and alteration within the spirit and scope of the appended claims. The description is not intended to be exhaustive or to limit the invention to the precise form disclosed. It should be understood that the invention can be practiced with modification and alteration and that the invention be limited only by the claims and the equivalents thereof.
This application is a continuation of U.S. patent application Ser. No. 16/214,575, filed on Dec. 10, 2018, which claims priority from U.S. Provisional Patent Application No. 62/596,904, filed on Dec. 10, 2017 and, U.S. Provisional Patent Application No. 62/751,240, filed on Oct. 26, 2018, each of which is incorporated herein by reference in their entirety
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Number | Date | Country | |
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20220163694 A1 | May 2022 | US |
Number | Date | Country | |
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62751240 | Oct 2018 | US | |
62596904 | Dec 2017 | US |
Number | Date | Country | |
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Parent | 16214575 | Dec 2018 | US |
Child | 17650188 | US |