Lithographically fabricated holographic optical identification element

Abstract

A method for fabricating an optical identification element is provided, wherein a removable plate or substrate having photosensitive material fabricated thereon, one or more gratings are written on the photosensitive material, then lines are etched to create one or more separate optical identification elements. The one or more gratings may be written by exposing the photosensitive material to ultraviolet (UV) light. The lines may be etched to create the one or more separate optical identification elements by photolithography to define/create the same.

Description

BACKGROUND OF INVENTION

1. Technical Field

The present invention relates to a method and apparatus for fabricating an optical identification element; and more particularly to a method and apparatus for fabricating a holographic optical identification element using a lithographic technique, as well as the holographic optical identification element itself.

SUMMARY OF INVENTION

The present invention provides a new and unique method for fabricating an optical identification element, wherein a removable plate or substrate having a photosensitive material fabricated on is provided, one or more gratings are written on the photosensitive material, then lines are etched to create one or more separate optical identification elements.

The one or more gratings may be written by exposing the photosensitive material to ultraviolet (UV) light.

The lines may be etched to create the one or more separate optical identification elements by photolithography to define/create the same.

The one or more separate optical identification element are planar elements.

The optical identification element may take the form of a holographic optical identification element having one of the following geometric shapes, such as a plate, a bar, a brick, a disc, a slab, etc.

The method according to the present invention enables many possible options, geometries, sizes, photosensitive materials in relation to the overall fabrication of an optical identification element.

The present invention also includes the possibly of using a surface relief grating, a densification grating, cover slips, or borosilcate.

The scope of the invention is also intended to include the apparatus for fabricating an optical identification element consistent with the description of the aforementioned method, including a combination of devices for performing the steps described above, as well as an optical identification element that results from the steps of the method or process shown and described herein.

One advantage of the present invention is that conventional technology may be used to fabricate an optical identification element with a high level of flexibility.

In effect, the present invention potentially adds a whole new dimension to existing biochip technology.

BRIEF DESCRIPTION OF THE DRAWING

The drawing, which is not drawn to scale, includes the following:

FIG. 1 is a diagram of steps for fabricating a optical identification element according to the present invention.

FIG. 2 is a diagram of a partially etched substrate according to the present invention.

FIG. 3 is a block diagram of an optical arrangement for fabricating an optical identification element according to the present invention.

FIG. 4 is a diagram of an optical identification element according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows steps 1-4 for performing a method for fabricating an optical identification element 20 (see also FIG. 4) according to the present invention.

In step 1, a removable plate or substrate 10 having a photosensitive material 10 fabricated thereon. Suitable photosensitive materials are known in the art, and the scope of the invention is not intended to be limited to any particular kind either now known or later developed in the future. The plate or substrate 10 may take the form of many different medium or material, including, but not limited to, an optical medium or material, although the scope of the invention is also intended to include other materials for the substrate now known or later developed in the future.

In step 2, one or more gratings 13 (best shown in FIGS. 2 and 4) are written on the photosensitive material 12, for example, by exposing the photosensitive material 12 to ultraviolet (UV) light 14, although the scope of the invention is also intended to include using other grating writing techniques either now known or later developed in the future.

In step 3, one or more lines 16 are etched or formed to create and form one or more separate optical identification elements that are generally indicated as 18 in FIG. 1 using photolithography to define/create the same, although the scope of the invention is also intended to include using other etching techniques either now known or later developed in the future.

In step 4, the etching process in step 3 results in the formation of the one or more separate optical identification elements 20. In this case, the elements 18 are removed or separated from the substrate 10 by the etching process. Alternatively, the elements 18 may be removed or separated from the substrate 10 by exposing them in a suitable solution and form the one or more optical identification elements 20. Such a suitable solution is known in the art, and the scope of the invention is not intended to be limited to any particular type or kind thereof. The one or more separate optical identification element 20 take the form of planar elements, as distinguished from optical fiber, optical filaments, or the like that are known in the art.

Moreover, the scope of the invention is intended to include the optical identification element 20 taking the form of a holographic optical identification element or other suitable optical identification element having an interference pattern reproduced from a pattern of interference produced by a split coherent beam of radiation (as a laser) either now known or later developed in the future, or by any of the techniques described in copending U.S. patent application CV-0038A or CV-0044, and other related cases referenced herein. Moreover, the optical identification elements 20 may take the geometric form of one or more planar objects, including plates, bars, bricks, discs, slabs, chips, or other suitable planar geometric shape and/or dimensionality now known or later developed in the future, including those described in CV-0038A and other patent applications referenced herein.

Alternative Technique

The present invention also provides an alternative format micro “chip” assay technique relating to code reading via embedded collocated gratings, as follows:

Grating Orientation:

The scope of the invention is intended to include at least the following grating orientation techniques shown by way of example in FIG. 2:

1) Writing grating codes 13a, 13b, 13c, 13d1, 13d2 at multiple axes across each disc or element 18—where a single axis reader always may be used to pick up one code.

2) Adding orientation ‘marker’ 15 to one or more discs or elements 18, such as by adding one or more of the following:

• • a) Magnetic material for self-alignment;
  • b) Birefringence; or
  • c) Fluorescence to determine alignment/orientation. 3) Putting each “bit” in along a different axis and use a spinning readout system (e.g. each bit assessed).

The Optical Arrangement or Apparatus

The scope of the invention is also intended to include an optical arrangement or apparatus for fabricating an optical identification element consistent with the description of the aforementioned method, including a combination of devices for performing the steps described above. For example, FIG. 3 shows the optical arrangement or apparatus generally indicated as 30 for fabricating such an optical identification element 20, including the combination of a means or device 32 for providing a removable plate or substrate 10 having the photosensitive material 12 fabricated thereon; a means or device 34 for writing one or more gratings 13, 13a, 13b, 13c, 13d1, 13d2 (see FIG. 2) on the photosensitive material 12; and a means or device 36 for separating and creating the one or more separate optical identification elements 20, including by, e.g., etching the lines 16 on the photosensitive material 12.

The Optical Identification Element 20

FIG. 4 shows, by way of example, the optical identification element 20 in greater detail that results from the steps of the method or process shown in FIG. 1, and/or the optical arrangement shown in FIG. 3. The scope of the invention is also intended to include the optical identification element itself made by the method or process set forth above, including, but not limited to, a holographic optical identification element made from the lithographic technique described herein. The present invention may be used to create the encoded elements consistent with that described in copending U.S. patent application Ser. No. 10/661,234, filed 12 Sep. 2003 (CyVera Docket No. CV-0038A) and the other patent applications referenced herein, which are incorporated herein by reference in their entirety.

Applications, Uses, Geometries and Embodiments for the Encoded Element of the Present Invention

Applications, uses, geometries and embodiments for the encoded element of the present invention may be the same as that described in the following cases which are all incorporated herein by reference in their entirety: U.S. patent application Ser. No. 10/661,234 (CyVera Docket No. CV-0038A), filed Sep. 12, 2003, entitled “Diffraction Grating-Based Optical Identification Element”; U.S. patent application Ser. No. 10/661,031 (CyVera Docket No. CV-0039A) filed Sep. 12, 2003, entitled “Diffraction Grating-Based Encoded Micro-particles for Multiplexed Experiments”; U.S. patent application Ser. No. 10/661,082 (CyVera Docket No. CV-0040), filed Sep. 12, 2003, entitled “Method and Apparatus for Labeling Using Diffraction Grating-Based Encoded Optical Identification Elements”; U.S. patent application Ser. No. 10/661,115 (CyVera Docket No. CC-0041), filed Sep. 12, 2003, entitled “Assay Stick”; U.S. patent application Ser. No. 10/661,836 (CyVera Docket No. CV-0042), filed Sep. 12, 2003, entitled “Method and Apparatus for Aligning Microbeads in order to Interrogate the Same”; U.S. patent application Ser. No. 10/661,254 (CyVera Docket No. CV-0043), filed Sep. 12, 2003, entitled “Chemical Synthesis Using Diffraction Grating-based Encoded Optical Elements”; U.S. patent application Ser. No. 10/661,116 (CyVera Docket No. CV-0044), filed Sep. 12, 2003, entitled “Method of Manufacturing of a Diffraction grating-based identification Element”; and U.S. patent application Ser. No. 10/763,995 (CyVera Docket No. CV-0054), filed Jan. 22, 2004, entitled, “Hybrid Random Bead/Chip Based Microarray”, U.S. Provisional Patent Applications Ser. Nos. 60/609,583, 60/610,059 and 60/609,712, all filed Sep. 13, 2004 (CV-0082PR, 83PR and 84PR); U.S. Provisional Patent Applications Ser. Nos. 60/611,205, 60/610,910, 60/610,833, 60/610,829, 60/610,928, all filed Sep. 17, 2004 (CV-0085PR, 86PR, 87PR, 88PR and 89PR); U.S. Provisional Patent Application Ser. No. 60/611,676, filed Sep. 20, 2004 (CV-0091PR); and U.S. patent applications Ser. No. 10/956,791, filed Oct. 1, 2004 (CV-0092 US).

Computer Programs and Other Data Processing Methods

Various aspects of the present invention may be conducted in an automated or semi-automated manner, generally with the assistance of well-known data processing methods. Computer programs and other data processing methods well known in the art may be used to store information including e.g. microbead identifiers, probe sequence information, sample information, and binding signal intensities. Data processing methods well known in the art may be used to read input data covering the desired characteristics.

Applications

The invention may be used in many areas such as drug discovery, functionalized substrates, biology, proteomics, combinatorial chemistry, DNA analysis/tracking/ sorting/tagging, as well as tagging of molecules, biological particles, matrix support materials, immunoassays, receptor binding assays, scintillation proximity assays, radioactive or non-radioactive proximity assays, and other assays, (including fluorescent, mass spectroscopy), high throughput drug/genome screening, and/or massively parallel assay applications. The invention provides uniquely identifiable beads with reaction supports by active coatings for reaction tracking to perform multiplexed experiments.

Scope of the Invention

The dimensions and/or geometries for any of the embodiments described herein are merely for illustrative purposes and, as such, any other dimensions and/or geometries may be used if desired, depending on the application, size, performance, manufacturing requirements, or other factors, in view of the teachings herein.

It should be understood that, unless stated otherwise herein, any of the features, characteristics, alternatives or modifications described regarding a particular embodiment herein may also be applied, used, or incorporated with any other embodiment described herein. Also, the drawings herein are not drawn to scale.

Although the invention has been described and illustrated with respect to exemplary embodiments thereof, the foregoing and various other additions and omissions may be made therein and thereto without departing from the spirit and scope of the present invention.

Moreover, the invention comprises the features of construction, combination of elements, and arrangement of parts which will be exemplified in the construction hereinafter set forth.

It will thus be seen that the objects set forth above, and those made apparent from the preceding description, are efficiently attained and, since certain changes may be made in the above construction without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

Claims

1. A method for fabricating an optical identification element comprising: providing a removable substrate having photosensitive material fabricated thereon;writing one or more gratings on the photosensitive material; andetching lines into the removable substrate to create one or more optical identification elements.

2. A method according to claim 1, wherein the optical identification element has a planar shape.

3. A method according to claim 1, wherein the optical identification element includes a holographic optical identification element.

4. A method according to claim 1, wherein the optical identification element has an interference pattern reproduced from a pattern of interference produced by a split coherent beam of radiation.

5. A method according to claim 1, wherein the writing one or more gratings includes exposing the photosensitive material to ultraviolet (UV) light.

6. A method according to claim 1, wherein the etching lines includes using photolithography to create the one or more optical identification elements.

7. A method according to claim 1 further comprising removing the optical identification elements from the substrate.

8. A method according to claim 1, wherein the one or more gratings include a surface relief grating, a densification grating, cover slips, or borosilcate.

9. A method according to claim 1, wherein the substrate includes an optical material.

10. A method according to claim 1, wherein the method includes writing grating codes at multiple axes across each optical identification element, where a single axis reader picks up one code.

11. A method according to claim 1, wherein the method includes adding an orientation marker to the optical identification element.

12. A method according to claim 11, wherein the orientation marker includes one or more of the following: a) magnetic material for self-alignment; b) birefringence; or c) fluorescence to determine alignment/orientation.

13. A method according to claim 1, wherein the method includes putting at least one bit in along different axes and using a spinning readout system.