Fluorene derivatized monomers and polymers for volume Bragg gratings

Patent metadata

Field	Value
Publication number	US-11718580-B2
Application number	US-202016865073-A
Country	US
Kind code	B2
Filing date	May 1, 2020
Priority date	May 8, 2019
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

The disclosure provides recording materials include fluorene derivatized monomers and polymers for use in volume Bragg gratings, including, but not limited to, volume Bragg gratings for holography applications. Several fluorene structures are disclosed: simply substituted fluorenes, cardo-fluorenes, and spiro-fluorenes. Fluorene derivatized polymers in Bragg gratings applications lead to materials with higher refractive index, low birefringence, and high transparency. Fluorene derivatized monomers/polymers can be used in any volume Bragg gratings materials, including two-stage polymer materials where a matrix is cured in a first step, and then the volume Bragg grating is written by way of a second curing step of a monomer.

First claim

The invention claimed is:

1. A recording material for writing a volume Bragg grating, the material comprising a transparent support, a polyurethane matrix, and a photopolymerizable imaging precursor compound of Formula II(b):

wherein in Formula II(b):
at least one of R 1 and R 2 comprises a group selected from

at least one of R 1 and R 2 comprises a polymerizable or crosslinkable group selected from optionally substituted alkenyl, optionally substituted cycloalkenyl, optionally substituted alkynyl, optionally substituted acrylate, optionally substituted methacrylate, optionally substituted styrene, optionally substituted epoxide, optionally substituted thiirane, optionally substituted glycidyl, optionally substituted lactone, optionally substituted lactam, and optionally substituted carbonate.

2. The recording material of claim 1 , wherein the material has a thickness of between 1 μm and 500 μm.

3. The recording material of claim 1 , wherein the at least one of R 1 and R 2 comprises a polymerizable or crosslinkable group selected from optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted epoxide, optionally substituted glycidyl, optionally substituted acrylate, and optionally substituted methacrylate.

4. The recording material of claim 1 , wherein the at least one of R 1 and R 2 comprises a polymerizable or crosslinkable group selected from optionally substituted alkenyl and optionally substituted alkynyl.

5. The recording material of claim 1 , wherein the at least one of R 1 and R 2 comprises a polymerizable or crosslinkable group selected from optionally substituted epoxide and optionally substituted glycidyl.

6. The recording material of claim 1 , wherein the at least one of R 1 and R 2 comprises a polymerizable or crosslinkable group selected from optionally substituted acrylate and optionally substituted methacrylate.

7. A volume Bragg grating recorded on the recording material of claim 1 , wherein the grating is characterized by a Q parameter equal to or greater than 5, wherein

Q
=

2
⁢
π
⁢

λ
0

⁢
d

n
0

⁢

Λ
2

and wherein λ 0 is a recording wavelength, d is the thickness of the recording material, n 0 is a refractive index of the recording material, and Λ is a grating constant.

Assignees

• Meta Platforms Tech Llc

Inventors

• Lane Austin
• Colburn Matthew E
• Purvis Lafe

Classifications

• C07C271/48 Primary

  to carbon atoms of hydrocarbon radicals substituted by singly-bound oxygen atoms · CPC title

• C07C69/54

  Acrylic acid esters; Methacrylic acid esters · CPC title

• C07C323/62

  having the sulfur atom of at least one of the thio groups bound to a carbon atom of a six-membered aromatic ring of the carbon skeleton · CPC title

• G03F7/025

  Non-macromolecular photopolymerisable compounds having carbon-to-carbon triple bonds, e.g. acetylenic compounds (G03F7/075 takes precedence) · CPC title

• G03F7/027

  Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds (G03F7/075 takes precedence) · CPC title